Sunday, March 6, 2022

Oracle 21c underscore (hidden) parameters and double-underscore parameters

 

Underscore (_) parameters in 21c:

SELECT /*+ use_hash(x y) */
    ksppinm name,
    ksppstvl value,
    ksppdesc description
FROM
    x$ksppi    x,
    x$ksppcv   y
WHERE
    ( x.indx = y.indx )
    AND bitand(ksppiflg, 268435456) = 0
    AND ksppinm not like '\_\_%' escape '\'
ORDER BY ksppinm;
namevaluedescription
DBFIPS_140FALSEEnable use of crypographic libraries in FIPS mode, public
_4030_dump_bitvec4095bitvec to specify dumps prior to 4030 error
_4031_dump_bitvec67194879bitvec to specify dumps prior to 4031 error
_4031_dump_interval300Dump 4031 error once for each n-second interval
_4031_max_dumps100Maximum number of 4031 dumps for this process
_4031_sga_dump_interval3600Dump 4031 SGA heapdump error once for each n-second interval
_4031_sga_max_dumps10Maximum number of SGA heapdumps
_AllowMultInsteadofDDLTrigger0Oracle internal parameter to allow multiple instead of DDL triggers
_EnableDDLTtriggerTracingFALSEenable ddl trigger tracing
_EnableShadowTypesFALSEenable shadow types
_ILM_FILTER_TIME0Upper filter time for ILM block compression
_ILM_FILTER_TIME_LOWER0Lower filter time for ILM block compression
_ILM_POLICY_NAMEFALSEUser specified ILM policy name
_NUMA_bind_modedefaultNuma bind mode
_NUMA_float_spawnerFALSEfloat process spawner
_NUMA_instance_mappingNot specifiedSet of nodes that this instance should run on
_NUMA_pool_sizeNot specifiedaggregate size in bytes of NUMA pool
_PX_use_large_poolFALSEUse Large Pool as source of PX buffers
_REMOVE_INACTIVE_STANDBY_TDE_MASTER_KEYFALSERemove Inactive Standby TDE Master Key
_REMOVE_STDBY_OLD_KEY_AFTER_CHECKPOINT_SCNTRUERemove standby old key after checkpoint SCN
_STFForceTranslateOracleSQLFALSEif TRUE translation profile will translate Oracle SQL statements
_STFTranslateDynamicSQLFALSEif TRUE translation profile will translate dynamic SQL statements
_VIEW_DICTIONARY_ACCESSIBILITYFALSEView Dictionary Accessibility Support
_abort_on_mrp_crashFALSEabort database instance when MRP crashes
_abort_recovery_on_joinFALSEif TRUE, abort recovery on join reconfigurations
_ac_enable_dscn_in_racFALSEEnable Dependent Commit SCN tracking
_ac_strict_SCN_checkFALSEenforce strict SCN check for AC replay across DG failover
_accept_versionsList of parameters for rolling operation
_actgrp_spawn_offloadTRUEaction group spawn offload
_active_instance_count1024number of active instances in the cluster database
_active_session_idle_limit5active session idle limit
_active_session_legacy_behaviorFALSEactive session legacy behavior
_active_standby_fast_reconfigurationTRUEif TRUE optimize dlm reconfiguration for active/standby OPS
_adaptive_direct_readTRUEAdaptive Direct Read
_adaptive_direct_writeTRUEAdaptive Direct Write
_adaptive_fetch_enabledTRUEenable/disable adaptive fetch in parallel group by
_adaptive_log_file_sync_high_switch_freq_threshold3Threshold for frequent log file sync mode switches (per minute)
_adaptive_log_file_sync_poll_aggressiveness0Polling interval selection bias (conservative=0, aggressive=100)
_adaptive_log_file_sync_sampling_count128Evaluate post/wait versus polling every N writes
_adaptive_log_file_sync_sampling_time3Evaluate post/wait versus polling every N seconds
_adaptive_log_file_sync_sched_delay_window60Window (in seconds) for measuring average scheduling delay
_adaptive_log_file_sync_use_polling_threshold200Ratio of redo synch time to expected poll time as a percentage
_adaptive_log_file_sync_use_postwait_threshold50Percentage of foreground load from when post/wait was last used
_adaptive_log_file_sync_use_postwait_threshold_aging1001Permille of foreground load from when post/wait was last used
_adaptive_scalable_log_writer_disable_worker_threshold50Percentage of overlap across multiple outstanding writes
_adaptive_scalable_log_writer_enable_worker_aging999900Per million of redo gen rate when LGWR workers were last used
_adaptive_scalable_log_writer_enable_worker_threshold200Increase in redo generation rate as a percentage
_adaptive_scalable_log_writer_evaluation_fraction100Serial/parallel log writer evaluation fraction (in 10000ths)
_adaptive_scalable_log_writer_evaluation_interval60Serial/parallel log writer evaluation interval (in seconds)
_adaptive_scalable_log_writer_sampling_count128Evaluate single versus scalable LGWR every N writes
_adaptive_scalable_log_writer_sampling_time3Evaluate single versus scalable LGWR every N seconds
_adaptive_window_consolidator_enabledTRUEenable/disable adaptive window consolidator PX plan
_add_col_optim_enabledTRUEAllows new add column optimization
_add_nullable_column_with_default_optimTRUEAllows add of a nullable column with default optimization
_add_stale_mv_to_dependency_listTRUEadd stale mv to dependency list
_add_trim_for_nlssortTRUEadd trimming for fixed char semantics
_addm_auto_actions_enabledTRUEdetermines if ADDM can automatically implement its recommendations
_addm_auto_enableTRUEgoverns whether ADDM gets run automatically after every AWR snapshot
_addm_skiprulescomma-separated list of ADDM nodes to skip
_addm_version_checkTRUEgoverns whether ADDM checks the input AWR snapshot version
_adg_adt_redirect_apply_lag_threshold12000Maximum centi-secends of apply lag threshold
_adg_adt_redirect_catchup_wait_time12000Maximum centi-secends for standby to catch up
_adg_auto_close_pdbTRUEADG recovery auto close PDB upon PDB drop/unplug/rename marker
_adg_count_beyond_limit0Count the total number of objects if beyond redo marker length.
_adg_defer_segstatTRUEDefer the segment statistics update on standby.
_adg_distributed_lockmasterFALSEstandby runs under ADG distributed lockmaster mode
_adg_influx_qscn_gap0maximium time gap between influx scn and qscn update in seconds
_adg_instance_recoveryTRUEenable ADG instance recovery
_adg_objectlock_attempts2Maximum attemps for objectlock get on ADG
_adg_objectlock_maxnum1000The maximum limit of the objectlock number on ADG
_adg_objectlock_timeout0timeout for objectlock get on ADG in centiseconds
_adg_parselock_timeout0timeout for parselock get on ADG in centiseconds
_adg_parselock_timeout_sleep100sleep duration after a parselock timeout on ADG in milliseconds
_adg_redirect_upd_to_primary_max_retries500max retries for ADT redirect to Primary from ADG
_adjust_literal_replacementFALSEIf TRUE, we will adjust the SQL/PLUS output
_adr_migrate_runonceTRUEEnable/disable ADR Migrate Runonce action
_advanced_index_compression_cmp_options0advanced index compression cmp options
_advanced_index_compression_opt_options0advanced index compression opt options
_advanced_index_compression_options0advanced index compression options
_advanced_index_compression_options_value0advanced index compression options2
_advanced_index_compression_recmp_crsz10advanced index compression limit recomp cr
_advanced_index_compression_recmp_cusz90advanced index compression limit recomp cu
_advanced_index_compression_recmp_nprg10advanced index compression limit recomp pu
_advanced_index_compression_trace0advanced index compression trace
_advanced_index_compression_tst_options0advanced index compression tst options
_advanced_index_compression_umem_options2147483647advanced index compression umem options
_afd_disable_fenceFALSEDisable AFD fencing
_affinity_onTRUEenable/disable affinity at run time
_age_block_batch_timeout_ms1000timeout before shipping out the batched age blockmessages in milliseconds
_aged_out_cursor_cache_time300number of seconds an aged out session cached cursor stay in cache
_aggregation_optimization_settings0settings for aggregation optimizations
_aiowait_timeouts100Number of aiowait timeouts before error is reported
_alert_expiration604800seconds before an alert message is moved to exception queue
_alert_message_cleanup1Enable Alert Message Cleanup
_alert_message_purge1Enable Alert Message Purge
_alert_post_background1Enable Background Alert Posting
_alert_segment_size10Alert-log segment size in MBs (1024*1024)
_alert_segment_textfileFALSEAlert-log text-file also to be segmented
_alert_segments_max0Alert-log max segments to retain, 0 for unlimited
_all_shared_dblinkstreat all dblinks as shared
_alloc_perm_as_freeFALSEallocate permanent chunks as freeable
_allocate_creation_orderFALSEshould files be examined in creation order during allocation
_allocate_flashback_bufferFALSEAllocate flashback buffer at mount time even if flashback is off
_allocation_update_interval3interval at which successful search in L1 should be updated
_allow_cell_smart_scan_attrTRUEAllow checking smart_scan_capable Attr
_allow_commutativityTRUEallow for commutativity of +, * when comparing expressions
_allow_compatibility_adv_w_grpFALSEallow advancing DB compatibility with guaranteed restore points
_allow_convert_to_standbyFALSEallow convert to standby to go through
_allow_cross_endian_dictionaryFALSEAllow cross-endian data dictionary
_allow_cross_version_chunk_moveFALSEOracle internal parameter
_allow_drop_snapshot_standby_grspFALSEAllow dropping snapshot standby guaranteed restore point
_allow_drop_ts_with_grpFALSEAllow drop Tablespace with guaranteed restore points
_allow_error_simulationFALSEAllow error simulation for testing
_allow_fallback_to_dbkeyFALSEif TRUE, allow fallback to dbkey
_allow_file_1_offline_error_1245FALSEdon't signal ORA-1245 due to file 1 being offline
_allow_insert_with_update_checkFALSEAllow INSERT as statement_types when update_check is FALSE
_allow_level_without_connect_byFALSEallow level without connect by
_allow_privileged_session_dblink_connFALSEAllow privileged session for dblink connection
_allow_read_only_corruptionFALSEallow read-only open even if database is corrupt
_allow_resetlogs_corruptionFALSEallow resetlogs even if it will cause corruption
_allow_synonym_for_credentialTRUEAllow public/private synonym for scheduler credential
_allow_terminal_recovery_corruptionFALSEFinish terminal recovery even if it may cause corruption
_allow_triggers_on_vpd_tableFALSEAllow triggers on VPD protected table in DML
_allow_xdb_anonymous_logonFALSEAllow XDB anonymous logon
_allowed_pvf_ownersList of schemas allowed to own password verification function
_alter_adg_redirect_behaviornoneAlter ADG's Redirection behavior
_alter_upgrade_signature_onlyFALSEalter table upgrade only sets signature
_alternate_iot_leaf_block_split_pointsTRUEenable alternate index-organized table leaf-block split-points
_always_anti_joinCHOOSEalways use this method for anti-join when possible
_always_semi_joinCHOOSEalways use this method for semi-join when possible
_always_star_transformationFALSEalways favor use of star transformation
_always_vector_transformationFALSEalways favor use of vector transformation
_analyze_comprehensiveFALSEAnalyze comprehensive mode
_and_pruning_enabledTRUEallow partition pruning based on multiple mechanisms
_app_container_debug0Enable Debug tracing in Application container
_app_default_containersFALSEcontainers_default and container_map enabled by default on MDL application object
_app_ignore_errorsTRUEignore errors during containers() on application object
_app_replay_silent_errorsFALSEsilently ignore all errors during application sync
_application_purge_enabledTRUEIs an application purge allowed
_application_scriptFALSERunning an application script
_apppdb_multi_slave_syncFALSEMultiple slaves used during Application sync
_appqos_cdb_setting0QoSM CDB Performance Class Setting
_appqos_po_multiplier1000Multiplier for PC performance objective value
_appqos_qt10System Queue time retrieval interval
_approx_cnt_distinct_gby_pushdownchooseperform group-by pushdown for approximate distinct count query
_approx_cnt_distinct_optimization0settings for approx_count_distinct optimizations
_approx_perc_sampling_err_rate2error rate percentage of approximate percentile using sampling
_approx_percentile_optimization0settings for approx_percentile optimization
_apx_root_directoryAPXAPX default root directory
_aq_Txn_ht_sz1024Message cache Txn Hash table size
_aq_addpt_batch_size1Add PT batch Size
_aq_dly_bkt2Delay Bucket Size
_aq_dq_prefetch_Siz5AQ PT DQ prefech Size
_aq_dqblocks_in_cache0deq blocks in cache
_aq_droppt_batch_size5Drop PT batch Size
_aq_free_list_pools10state object and transaction memory pools
_aq_init_shards5Minimum enqueue shards per queue at an instance
_aq_ipc_max_slave10maximum number of slaves for knlpipcm
_aq_latency_absolute_threshold300Absolute threshold greater than average latency
_aq_latency_relative_threshold100Relative threshold of average latency
_aq_lb_cycle120Time(seconds) between consecutive AQ load balancing efforts
_aq_lb_garbage_col_interval600AQ LB garbage collect interval
_aq_lb_stats_collect_cycle45Time(seconds) between consecutive AQ load statistics collection
_aq_lb_subht_bkt_ltch32AQ LB subscriber ht bucket latches
_aq_lb_subht_elm_ltch128AQ LB subscriber ht element latches
_aq_lookback_size60AQ PT Look Back Size
_aq_max_pdb_close_msg1Max Number of AQ Recovery Messages when pdb is closed
_aq_max_scan_delay1500Maximum allowable scan delay for AQ indexes and IOTs
_aq_opt_background_enabledTRUEAQ: OPT Operations Background enabled
_aq_opt_enabledTRUEAQ: OPT Operations enabled
_aq_opt_fudge_factor500AQ: OPT Fudge Factor for pre-fretching
_aq_opt_min_evict_memory0AQ: OPT LWM memory for eviction to stop
_aq_opt_preevict_dop3AQ: OPT Background: PreEvict Degree Of Parallelism
_aq_opt_prefetch_dop3AQ: OPT Background: Prefetch Degree Of Parallelism
_aq_opt_prefetch_horizon60AQ: OPT horizon for pre-fretching
_aq_opt_stat_window21600AQ: OPT Subscriber Statistics Window Size
_aq_opt_stop_statFALSEAQ: OPT Stop Collection of Subscriber Statistics
_aq_pt_processes10Partition background processes
_aq_pt_shrink_frequency1450PT shrink window Size
_aq_pt_statistics_window60PT statistics sample window Size
_aq_qt_prefetch_Size5AQ PT QT prefech Size
_aq_queue_global_serviceAQ queue global service
_aq_retry_timeouts0retry timeouts
_aq_scrambled_deqlog1scrambled deqlog
_aq_shard_bitmap_child_latches32Bitmap child latches
_aq_shard_child_latches512Shard child latches
_aq_shard_prty_latches16Shard priority child latches
_aq_shard_retry_child_latches32Retry child latches
_aq_shard_sub_child_Elem_latches1024Subscriber Element child latches
_aq_shard_sub_child_latches512Subscriber child latches
_aq_shard_txn_child_latches128Txn child latches
_aq_stop_backgroundsFALSEStop all AQ background processes
_aq_streaming_threshold10485760large payload threshold size
_aq_subshard_Size20000Sub Shard Size
_aq_subshards_per_dqpartition1SubShards Per Deq Partition
_aq_subshards_per_qpartition1SubShards Per Q Partition
_aq_tm_deqcountinterval0dequeue count interval for Time Managers to cleanup DEQ IOT BLOCKS
_aq_tm_processes_dump_interval12Time(minutes) between consecutive Dumps in alert log
_aq_tm_scanlimit0scan limit for Time Managers to clean up IOT
_aq_tm_statistics_duration0statistics collection window duration
_aq_truncpt_batch_size1Trunc PT batch Size
_aq_uncached_stats0Uncached Stats
_aq_x_mode1AQ - cross mode
_aq_x_msg_size32768AQ cross single message buffer size
_aqsharded_cache_limit0Limit for cached enqueue/dequeue operations
_aqsharded_cached_hint0sharded queue cached hint
_aqsharded_enq_fresh_ptn_reloadTRUEstart enqueueing to a fresh partition on reload
_aqsharded_lowmem_timeout1000sharded queue low mem timeout (in centiseconds)
_aqsharded_reload_tune2sharded queue tune reload behaviour
_arch_comp_dbg_scan0archive compression scan debug
_arch_comp_dec_block_check_dump1decompress archive compression blocks for checking and dumping
_arch_compress_checksumsFALSEenable/disable row checksums for archive compressed blocks
_arch_compressionTRUEarchive compression enabled
_arch_io_slaves0ARCH I/O slaves
_array_cdb_view_enabledTRUEarray mode enabled for CDB views
_array_update_vector_read_enabledFALSEEnable array update vector read
_ash_compression_enableFALSETo enable or disable string compression in ASH
_ash_disk_filter_ratio10Ratio of the number of in-memory samples to the number of samples actually written to disk
_ash_disk_write_enableTRUETo enable or disable Active Session History flushing
_ash_dummy_test_param0Oracle internal dummy ASH parameter used ONLY for testing!
_ash_eflush_trigger66The percentage above which if the in-memory ASH is full the emergency flusher will be triggered
_ash_enableTRUETo enable or disable Active Session sampling and flushing
_ash_min_mmnl_dump90Minimum Time interval passed to consider MMNL Dump
_ash_progressive_flush_interval300ASH Progressive Flush interval in secs
_ash_sample_allFALSETo enable or disable sampling every connected session including ones waiting for idle waits
_ash_sampling_interval1000Time interval between two successive Active Session samples in millisecs
_ash_size1048618To set the size of the in-memory Active Session History buffers
_asm_accessautoASM File access mechanism
_asm_access_assume_localFALSEAssume IOS client is in the same cluster as IOS
_asm_acd_chunks1initial ACD chunks created
_asm_admin_with_sysdbaFALSEDoes the sysdba role have administrative privileges on ASM?
_asm_allow_appliance_dropdisk_noforceFALSEAllow DROP DISK/FAILUREGROUP NOFORCE on ASM Appliances
_asm_allow_appliance_offlineonlineFALSEAllow OFFLINE/ONLINE DISK/FAILUREGROUP on ASM Appliances
_asm_allow_dangerous_unprotected_volumesFALSEDisable checking for unprotected volumes in mirrored disk groups
_asm_allow_dgname_special_charsFALSEEnable the use of special characters in diskgroup names
_asm_allow_foreign_siteguidsDisable checking for foreign siteguid on a given node
_asm_allow_lvm_resilveringTRUEEnable disk resilvering for external redundancy
_asm_allow_older_clientsFALSEAllow older clients to connect to the ASM server
_asm_allow_only_raw_disksTRUEDiscovery only raw devices
_asm_allow_prepare_splitTRUEAllow database prepare and split in non-appliance mode
_asm_allow_small_memory_targetFALSEAllow a small memory_target for ASM instances
_asm_allow_system_alias_renameFALSEif system alias renaming is allowed
_asm_allow_unsafe_reconnectTRUEattempt unsafe reconnect to ASM
_asm_allowdegeneratemountsFALSEAllow force-mounts of DGs w/o proper quorum
_asm_appliance_config_fileAppliance configuration file name
_asm_appliance_disable_fg_checkFALSEDisable failure group check
_asm_appliance_ignore_oakFALSEIgnore OAK appliance library
_asm_appliance_slot_from_pathFALSEGet appliance disk slot from disk path
_asm_asmb_max_wait_timeout6timeout before processes are signaled with network interrupt
_asm_asmb_rcvto10Receive timeout for ASMB in seconds
_asm_async_scrub_reap_wait100000Async scrubbing reaping IO wait in microseconds
_asm_audit_sp_paramASM audit spare parameter
_asm_ausize1048576allocation unit size
_asm_auto_online_intervalauto online interval
_asm_automatic_rezoneTRUEautomatically rebalance free space across zones
_asm_avoid_pst_scansTRUEAvoid PST Scans
_asm_blksize4096metadata block size
_asm_br_listener_port51521Bitrotter listener port for testing purpose
_asm_brfuzz_ios_lsnrport0IOS listener port for fuzzing with Bitrotter
_asm_buffer_overlap_tracerFALSEEnables kfioBufOverlapTracer
_asm_cancel_alert_time600Wait time for I/O cancel alert message (in seconds)
_asm_cancel_delta75000Delta timeout for blocking big writes in milliseconds
_asm_cclient_cleanup_timeout300timeout before cleaning up remote cluster clients
_asm_check_for_misbehaving_cf_clientsFALSEcheck for misbehaving CF-holding clients
_asm_compatibility11.2.0.2default ASM compatibility level
_asm_dba_batch500000ASM Disk Based Allocation Max Batch Size
_asm_dba_spcchk_thld100000ASM Disk Based Allocation Space Check Threshold
_asm_dba_threshold0ASM Disk Based Allocation Threshold
_asm_dbmsdg_nohdrchkFALSEdbms_diskgroup.checkfile does not check block headers
_asm_dependency_under_cfenqueueTRUESend dependency request if holding CF enqueue
_asm_diag_dead_clientsFALSEdiagnostics for dead clients
_asm_direct_con_expire_time120Expire time for idle direct connection to ASM instance
_asm_disable_amdu_dumpFALSEDisable AMDU dump
_asm_disable_async_msgsFALSEdisable async intra-instance messaging
_asm_disable_dangerous_failgroup_checkingFALSEDisable checking for dubious failgroup configurations
_asm_disable_failgroup_count_checkingFALSEDisable checking for failure group count
_asm_disable_failgroup_size_checkingFALSEDisable checking for failure group size
_asm_disable_multiple_instance_checkFALSEDisable checking for multiple ASM instances on a given node
_asm_disable_patch_compatFALSEdisable DG patch compatibility checks
_asm_disable_proact_client_cleanupFALSEdisable proactive client cleanup
_asm_disable_profilediscoveryFALSEdisable profile query for discovery
_asm_disable_request_tracerTRUEDisable kfioRqTracer
_asm_disable_smr_creationFALSEDo Not create smr
_asm_disable_ufg_dumpFALSEdisable terminated umbilicus diagnostic
_asm_disable_ufgmemberkillFALSEdisable ufg member kill
_asm_disable_vtoc_checkFALSEDisable vtoc/sector 0 check
_asm_disable_vxn_map_messagesFALSEdisable using vxn map messages
_asm_disk_repair_time14400seconds to wait before dropping a failing disk
_asm_diskerr_traces2Number of read/write errors per disk a process can trace
_asm_diskgroup_renew_timeout20timeout FENC will give former ASMB group owner to renew
_asm_diskgroups2disk groups to mount automatically set 2
_asm_diskgroups3disk groups to mount automatically set 3
_asm_diskgroups4disk groups to mount automatically set 4
_asm_dump_split_pw10Seconds to wait before requesting dump of split pending writes
_asm_emulate_nfs_diskFALSEEmulate NFS disk test event
_asm_emulmax10000max number of concurrent disks to emulate I /O errors
_asm_emultimeout0timeout before emulation begins (in 3s ticks)
_asm_enable_batch_scrubFALSEAllow scrubbing verification to run in batch mode
_asm_enable_kfiosFALSEEnable KFIOS module
_asm_enable_kfksFALSEEnable KFKS module
_asm_enable_lostwrite_scrubFALSEAllow lost write detection in scrubbing
_asm_enable_map_shareTRUEEnable ASM extent map share
_asm_enable_multiple_asmbTRUEAllow the ASM client to have multiple ASMB background processes
_asm_enable_parity_scrubFALSEAllow scrubbing parity files
_asm_enable_parityfile_creationTRUEEnable parity files creation
_asm_enable_repair_lostwrite_scrubFALSEAllow repairing lost write in scrubbing
_asm_enable_vfreloc_on_rmFALSEEnable voting file relocation on rolling migration
_asm_enable_xrovFALSEEnable XROV capability
_asm_evenread2ASM Even Read level
_asm_evenread_alpha0ASM Even Read Alpha
_asm_evenread_alpha20ASM Even Read Second Alpha
_asm_evenread_faststart0ASM Even Read Fast Start Threshold
_asm_fail_random_rxFALSERandomly fail some RX enqueue gets
_asm_fd_cln_idle_sess_twait60000000Idle session time wait to run ASM FD cleanup
_asm_fd_cln_on_fgTRUEASM stale FD cleanup on foregrounds
_asm_fob_tac_frequency9Timeout frequency for FOB cleanup
_asm_force_parity_extent_checkFALSEForce parity extent integrity check
_asm_force_paritycheck_rebalanceFALSEForce parity extent integrity check during rebalance
_asm_force_quiesceFALSEForce diskgroup quiescing
_asm_force_vamFALSEforce VAM for external redundancy
_asm_frag_threshold50Percentage threshold before disk/diskgroup is deemed fragmented
_asm_global_dump_level267System state dump level for ASM asserts
_asm_hard_checkTRUEH.A.R.D. check buffer before write operation
_asm_hbeatiowait120number of secs to wait for PST Async Hbeat IO return
_asm_hbeatwaitquantum2quantum used to compute time-to-wait for a PST Hbeat check
_asm_healthcheck_timeout180seconds until health check takes action
_asm_idn_processes0number of global open processes
_asm_imbalance_tolerance3hundredths of a percentage of inter-disk imbalance to tolerate
_asm_instlock_quota0ASM Instance Lock Quota
_asm_ios_network_domains0number of domains in ASM IOSERVER instance
_asm_ios_network_processes0number network processes per domain in ASM IOSERVER instance
_asm_iosconnect_timeout0Time (in 3secs multiples) before db gives up on connecting to IOS
_asm_iosfailover_freq3Frequency limit after which db gives up on failing over to IOS
_asm_iosfailover_timeout5Time window within which db tries to failover to IOS
_asm_iostat_latch_count31ASM I/O statistics latch count
_asm_iowp_max_async0maximum async IOs per IO worker process
_asm_kfdpevent0KFDP event
_asm_kill_unresponsive_clientsTRUEkill unresponsive ASM clients
_asm_librariesufslibrary search order for discovery
_asm_log_scale_rebalanceFALSERebalance power uses logarithmic scale
_asm_lsod_bucket_size67ASM lsod bucket size
_asm_max_aux_cods5maximum number of auxiliary cods in sparse disk groups
_asm_max_clients1000maximum number of clients this IOS instance can service
_asm_max_cod_strides10maximum number of COD strides
_asm_max_connected_clients3The high water mark value for connected clients
_asm_max_kfsg_free_heap_perc10Max percentage of SGA memory reserved for kfsga free heap
_asm_max_kfsg_free_heap_size524288000Max buffer size reserved for kfsga free heap
_asm_max_occupied90Maximum percentage of disk occupied to check for fragmentation
_asm_max_parallelios256Maximum simultaneous outstanding IOs
_asm_max_redo_buffer_size2097152asm maximum redo buffer size
_asm_maxio1048576Maximum size of individual I/O request
_asm_min_compatibility11.2.0.2default mininum ASM compatibility level
_asm_min_occupied50Minimum percentage of disk occupied to check for fragmentation
_asm_netp_factor0number of network processes per net
_asm_netp_iosize0maximum io size
_asm_network_timeout1Keepalive timeout for ASM network connections
_asm_networksASM network subnet addresses
_asm_node_numberASM node number
_asm_node_site_guidASM site GUID of node
_asm_nodekill_escalate_time180secs until escalating to nodekill if fence incomplete
_asm_noevenread_diskgroupsList of disk groups having even read disabled
_asm_oda_typeODA Type
_asm_odapremchkTRUECheck premature storage for ODA
_asm_offline_wait_timeout300Timeout for offline wait
_asm_offload_allFALSEOffload all write operations to Exadata cells, when supported
_asm_ownerid_trace_timeout600ownerid tracing threshold in seconds
_asm_partner_target_disk_part8target maximum number of disk partners for repartnering
_asm_partner_target_fg_rel4target maximum number of failure group relationships for repartnering
_asm_primary_load1Number of cycles/extents to load for non-mirrored files
_asm_primary_load_cyclesTRUETrue if primary load is in cycles, false if extent counts
_asm_procs_trace_diskerr5Number of processes allowed to trace a disk failure
_asm_proxy_online_restart0Allow patching while ADVM volumes are online
_asm_proxy_startwait60Maximum time to wait for ASM proxy connection
_asm_pst_rsinfo0file redundancies to consider during PST liveness checks
_asm_pstonpartnersTRUESelect ideal PST disks following partnership
_asm_random_zoneFALSERandom zones for new files
_asm_read_cancelAUTORead cancel timeout in milliseconds
_asm_read_cancel_back_out5000Time period in milliseconds when no reads are issued to a disk after a read is cancelled
_asm_rebalance_estimates_processTRUEPerform rebalance estimates in ARB-A process
_asm_rebalance_plan_size120maximum rebalance work unit
_asm_rebalance_space_errors1000number of out of space errors allowed before aborting rebalance
_asm_reloc_cicFALSEAllow relocation during rolling migration
_asm_relocation_async_lock_count128limit of asynchronous map locks during relocation
_asm_relocation_ignore_hard_failure0ignore HARD for relocation
_asm_relocation_schemealloc_p2 alloc_s3 reb_p2 reb_s1 bal_p2 bal_s3 prep_p2 prep_s3ASM allocation / relocation scheme
_asm_relocation_traceFALSEenable extent relocation tracing
_asm_remote_client_timeout300timeout before killing disconnected remote clients
_asm_repairquantum60quantum (in 3s) used to compute elapsed time for disk drop
_asm_reserve_slavesTRUEreserve ASM slaves for CF txns
_asm_resyncCkpt1024number of extents to resync before flushing checkpoint
_asm_root_directoryASMASM default root directory
_asm_runtime_capability_volume_supportFALSEruntime capability for volume support returns supported
_asm_scrub_asyncTRUEEnable asynchronous scrubbing
_asm_scrub_disable_codFALSEDisable scrubbing COD
_asm_scrub_limitAUTOASM disk scrubbing power
_asm_scrub_max_cod_wait5Number of minutes to delay scrub COD recovery
_asm_scrub_strictFALSEEnable strict scrubbing mode
_asm_scrub_unmatched_dba1024Scrub maximum number of blocks with unmatched DBA
_asm_secondary_load10000Number of cycles/extents to load for mirrored files
_asm_secondary_load_cyclesFALSETrue if secondary load is in cycles, false if extent counts
_asm_serialize_volume_rebalanceFALSESerialize volume rebalance
_asm_shadow_cycle3Inverse shadow cycle requirement
_asm_shared_pool_latch_timeout30seconds before terminating inst if ASMB is waiting for shared pool latch during shutdown
_asm_showpdb_asmtblFALSEAllow asm table values to be shown in pdb
_asm_skip_dbfile_iosFALSESkip I/Os to database files (do only ASM metadata I/O)
_asm_skip_diskval_checkFALSEskip client side discovery for disk revalidate
_asm_skip_rename_checkFALSEskip the checking of the clients for s/w compatibility for rename
_asm_skip_resize_checkFALSEskip the checking of the clients for s/w compatibility for resize
_asm_slow_client_timeout_percentage50Percentage of the write cancel timeout to detect slow client.
_asm_storagemaysplitFALSEPST Split Possible
_asm_stripesize131072ASM file stripe size
_asm_stripewidth8ASM file stripe width
_asm_sync_rebalanceFALSERebalance uses sync I/O
_asm_tcp_user_timeout1TCP_USER_TIMEOUT in minutes
_asm_trace_limit_timeout30000Time-out in milliseconds to reset the number of traces per disk and the number of processes allowed to trace
_asm_ufg_nw_wait_timeout10seconds to start health check on unresponsive clients
_asm_usd_batch64ASM USD Update Max Batch Size
_asm_wait_time18Max/imum time to wait before asmb exits
_asm_write_badfdata_in_contentcheckFALSEWrite BADFDA7A in content check
_asm_write_cancelAUTOWrite timeout in milliseconds
_asm_write_cancel_timeout_percentage30Percentage of the write timeout to wait before optional offline
_asm_xrov_cachelgio1ADVM cache large IO
_asm_xrov_nstats0Specify number of IOs before stats
_asm_xrov_nvios24Specify number of VIO processes
_asm_xrov_rsnmod2Specify 'reason' mode
_asm_xrov_singleFALSEEnable single issues of IOs
_asm_zero_power_limitallow setting zero power limit
_asmsidasmASM instance id
_assert_encrypted_tablespace_blocksTRUEif TRUE, assert encrypted tablespace blocks must be encrypted
_assert_single_current_bufferFALSEif TRUE, check and assert only one current buffer
_assm_auto_tracing_threshold10000ASSM threshold to start space search tracing
_assm_defaultTRUEASSM default
_assm_examination_blocks_threshold8196ASSM get space number of fuzzy blocks to examine
_assm_examination_enable_slaFALSEASSM get space enable examination limits
_assm_examination_time_threshold60ASSM get space examination time threshold in seconds
_assm_force_fetchmetaFALSEenable metadata block fetching in ASSM segment scan
_assm_high_gsp_threshold11024Number of blocks rejected before growing segment
_assm_l1cleanout_throttle_time3L1 bitmap block cleanout throttle time in seconds
_assm_latency_sampling_frequency0ASSM Latency sampling frequency in seconds
_assm_low_gsp_threshold10000Number of blocks rejected before collecting stats
_assm_segment_extension_percent100Percent of full blocks after which segment is extended
_assm_segment_repair_bgTRUEASSM Segment repair: bg enable
_assm_segment_repair_fg0ASSM Segment repair: fg
_assm_segment_repair_maxblks4294967294ASSM Segment repair: Max blocks per slave
_assm_segment_repair_timelimit60ASSM Segment repair: Max time in seconds per slave
_assm_space_cache_hb_expire3Seconds after which higher order bitmaps expire from space cache
_assm_space_cache_max_segments1024ASSM Maximum Segments to Track
_assm_test_force_rej0assm min number of blocks to cbk-reject
_assm_test_force_rej20assm min number of blocks to kdt-reject
_assm_test_reentrant_gspFALSEassm test reentrant gsp
_async_recovery_claimsTRUEif TRUE, issue recovery claims asynchronously
_async_recovery_readsTRUEif TRUE, issue recovery reads asynchronously
_async_rta_broadcastFALSEasynchronously broadcast RTA boundary
_async_scn_syncOFFAsynchronous SCN Sync Setting
_async_ts_threshold1check tablespace thresholds asynchronously
_atp_block_size_defaultTRUEATP setting block size to 8K
_auto_assign_cg_for_sessionsFALSEauto assign CGs for sessions
_auto_bmrenabledenable/disable Auto BMR
_auto_bmr_bg_time3600Auto BMR Process Run Time
_auto_bmr_fc_time60Auto BMR Flood Control Time
_auto_bmr_file_headerTRUEEnable Auto BMR for file header fix
_auto_bmr_max_rowno1024x$krbabrstat Max number of rows
_auto_bmr_noretry_window1800Auto BMR NoRetry Window
_auto_bmr_pub_timeout10Auto BMR Publish Timeout
_auto_bmr_req_timeout60Auto BMR Requester Timeout
_auto_bmr_sess_threshold30Auto BMR Request Session Threshold
_auto_bmr_sys_threshold100Auto BMR Request System Threshold
_auto_dismount_on_pdb_closeFALSEEnable implicit PDB dismount on PDB close
_auto_export_preplugin_backupTRUEauto export pre-plugin backup
_auto_manage_enable_offline_checkTRUEperodically check for OFFLINE disks and attempt to ONLINE
_auto_manage_enable_smart_rebalanceTRUEOFFLINE instead of DROP disk(s) when free space is not enough for rebalance
_auto_manage_exadata_disksTRUEAutomate Exadata disk management
_auto_manage_infreq_tout0TEST: Set infrequent timeout action to run at this interval, unit is seconds
_auto_manage_ioctl_bufsz8192oss_ioctl buffer size, to read and respond to cell notifications
_auto_manage_max_online_tries3Max. attempts to auto ONLINE an ASM disk
_auto_manage_num_pipe_msgs1000Max. number of out-standing msgs in the KXDAM pipe
_auto_manage_num_tries2Num. tries before giving up on a automation operation
_auto_manage_online_tries_expire_time86400Allow Max. attempts to auto ONLINE an ASM disk after lapsing this time (unit in seconds)
_auto_manage_smart_rebalance_grace_period_in_min0Number of minutes waited after ASM diskgroup free space increases and becomes sufficient for rebalance before dropping an ASM disk offlined due to insufficient free space
_auto_manage_smart_rebalance_space_threshold0Percentage of ASM diskgroup free space required for rebalance
_auto_mv_enabledFALSEenable/disable Auto MV logic in the sql access advisor
_auto_rcv_pdb_open1enable automatic recovery during pdb open
_auto_rekey_during_mrcvTRUEenable automatic rekey during media recovery
_automatic_maintenance_test0Enable AUTOTASK Test Mode
_automemory_broker_interval3memory broker statistics gathering interval for auto memory
_autoptn_costingFALSEDBMS_AUTO_PARTITION is compiling query for cost estimates
_autoptn_flags0DBMS_AUTO_PARTITION flags
_autoptn_translate_table_nameDBMS_AUTO_PARTITION table name translation
_autoptn_workload_id0DBMS_AUTO_PARTITION workload id
_autosts_capture_control3internal controls for auto STS capture
_autosts_long_interval0Auto STS long flush interval
_autosts_retention_interval31Auto STS retention interval
_autosts_short_interval300Auto STS short flush interval
_autotask_max_window480Maximum Logical Maintenance Window Length in minutes
_autotask_min_window15Minimum Maintenance Window Length in minutes
_autotask_test_action0test action parameter for AUTOTASK
_autotask_test_nameN/AName of current Autotask Test (or test step)
_autotbs_management_enabledFALSEallow automatic tablespace management
_autotune_gtx_idle_time600idle time to trigger auto-shutdown a gtx background process
_autotune_gtx_interval5interval to autotune global transaction background processes
_autotune_gtx_threshold60auto-tune threshold for degree of global transaction concurrency
_aux_dfc_keep_time1440auxiliary datafile copy keep time in minutes
_aux_storage_size0Auxillary storage for PDB.
_available_core_count0number of cores for this instance
_avoid_scn_growth1enable scn growth optimizations
_awr_cdbperf_threshold21Setting for AWR CDBPERF Threshold
_awr_corrupt_modeFALSEAWR Corrupt Mode
_awr_data_maskingFALSEEnable/Disable AWR data masking functionality
_awr_disabled_flush_tablesDisable flushing of specified AWR tables
_awr_disabled_purge_tablesDisable purging of specified AWR tables
_awr_enable_pdb_snapshotsTRUEEnable/Disable AWR PDB level snapshots
_awr_flush_threshold_metricsTRUEEnable/Disable Flushing AWR Threshold Metrics
_awr_flush_workload_metricsFALSEEnable/Disable Flushing AWR Workload Metrics
_awr_incremental_flush_enabledTRUEEnable/Disable AWR automatic incremental flushing
_awr_metrics_use_mmnlFALSEUse MMNL or other background process for AWR metrics
_awr_mmon_cpuusageTRUEEnable/disable AWR MMON CPU Usage Tracking
_awr_mmon_deep_purge_all_expiredFALSEAllows deep purge to purge AWR data for all expired snapshots
_awr_mmon_deep_purge_extent7Set extent of rows to check each deep purge run
_awr_mmon_deep_purge_interval7Set interval for deep purge of AWR contents
_awr_mmon_deep_purge_numrows5000Set max number of rows per table to delete each deep purge run
_awr_partition_interval0Setting for AWR Partition Interval
_awr_pdb_registration_enabledFALSEParameter to enable/disable AWR PDB Registration
_awr_restrict_modeFALSEAWR Restrict Mode
_awr_snapshot_levelBESTFITSet Default AWR snapshot level
_awr_sql_child_limit200Setting for AWR SQL Child Limit
_awr_warehouse_enabledTRUEEnable/Disable AWR warehouse functionality
_b_tree_bitmap_plansTRUEenable the use of bitmap plans for tables w. only B-tree indexes
_ba_cf_trace_buffer_size131072size of per-process I/O KBC trace buffer
_ba_container_filesystem_ausize4194304allocation unit size for Backup Appliance containers
_ba_max_containers0maximum number of Backup Appliance containers
_ba_max_groups0maximum number of Backup Appliance container groups
_ba_max_seg_bytes4000maximum number of bytes per array segment
_ba_timeouts_enabledTRUEenable timeouts
_background_process_opts0Misc BG procs parameter
_backup_align_write_ioTRUEalign backup write I/Os
_backup_appliance_enabledFALSEBackup Appliance Enabled
_backup_automatic_retry10automatic retry on backup write errors
_backup_block0defaultbackup block0
_backup_bool_spare1FALSEbackup bool spare1
_backup_bool_spare2FALSEbackup bool spare2
_backup_bool_spare3FALSEbackup bool spare3
_backup_bool_spare4FALSEbackup bool spare4
_backup_compressFALSEturn on backup compression always
_backup_disk_bufcnt0number of buffers used for DISK channels
_backup_disk_bufsz0size of buffers used for DISK channels
_backup_disk_io_slaves0BACKUP Disk I/O slaves
_backup_dynamic_buffersTRUEdynamically compute backup/restore buffer sizes
_backup_encrypt_opt_mode4294967294specifies encryption block optimization mode
_backup_file_bufcnt0number of buffers used for file access
_backup_file_bufsz0size of buffers used for file access
_backup_int_spare14294967294backup int spare1
_backup_int_spare24294967294backup int spare2
_backup_int_spare34294967294backup int spare3
_backup_int_spare44294967294backup int spare4
_backup_interrupt_wait_time1000specifies interrupt wait time in centi seconds
_backup_io_pool_size1048576memory to reserve from the large pool
_backup_kgc_bz2_bufsz0specifies buffer size to be used by BZ2 compression
_backup_kgc_bz2_niters0specifies number of iterations done by BZ2 compression
_backup_kgc_bz2_type0specifies type used by BZ2 compression
_backup_kgc_bzip2_blksiz9specifies buffer size to be used by BZIP2 compression
_backup_kgc_lzo_bufsz262144specifies buffer size to be used by LZO compression
_backup_kgc_medium_schemeDEFAULTspecifies medium compression scheme
_backup_kgc_schemeZLIBspecifies compression scheme
_backup_kgc_zlib_complevel1specifies compression (performance) level for ZLIB compression
_backup_kgc_zlib_memlevel8specifies memory level for ZLIB compression
_backup_kgc_zlib_windowbits15specifies window size for ZLIB compression
_backup_kgc_zstd_bufsz262144specifies buffer size to be used by ZSTD compression
_backup_kgc_zstd_complevel3specifies compression (performance) level for ZSTD compression
_backup_ksfq_bufcnt0number of buffers used for backup/restore
_backup_ksfq_bufmem_max268435456maximum amount of memory (in bytes) used for buffers for backup/restore
_backup_ksfq_bufsz0size of buffers used for backup/restore
_backup_max_gap_size4294967294largest gap in an incremental/optimized backup buffer, in bytes
_backup_max_wallet_session50specifies maximum wallet session for backup
_backup_min_ct_unused_optim2097152mimimun size in bytes of change tracking to apply unused space optimuzation
_backup_seq_bufcnt0number of buffers used for non-DISK channels
_backup_seq_bufsz0size of buffers used for non-DISK channels
_backup_text_spare1backup text spare1
_backup_text_spare2backup text spare2
_backup_text_spare3backup text spare3
_backup_text_spare4backup text spare4
_bct_bitmaps_per_file8number of bitmaps to store for each datafile
_bct_buffer_allocation_max1073741824maximum size of all change tracking buffer allocations, in bytes
_bct_buffer_allocation_min_extents1mininum number of extents to allocate per buffer allocation
_bct_buffer_allocation_size2097152size of one change tracking buffer allocation, in bytes
_bct_chunk_size0change tracking datafile chunk size, in bytes
_bct_crash_reserve_size262144change tracking reserved crash recovery SGA space, in bytes
_bct_file_block_size0block size of change tracking file, in bytes
_bct_file_extent_size0extent size of change tracking file, in bytes
_bct_fixtab_filechange tracking file for fixed tables
_bct_health_check_interval60CTWR health check interval (seconds), zero to disable
_bct_initial_private_dba_buffer_size0initial number of entries in the private change tracking dba buffers
_bct_mrp_timeout5CTWR MRP wait timeout (seconds), zero to wait forever
_bct_public_dba_buffer_dynresize2allow dynamic resizing of public dba buffers, zero to disable
_bct_public_dba_buffer_dynresize_delay3600control frequency of dynamic resizing of public dba buffers
_bct_public_dba_buffer_maxsize0max buffer size permitted for public dba buffers, in bytes
_bct_public_dba_buffer_size0total size of all public change tracking dba buffers, in bytes
_bequeath_via_brokerFALSEBequeath connections via broker
_bg_spawn_diag_opts0background processes spawn diagnostic options
_big_scn_test_mode2testing mode for BigSCN
_bigdata_external_tableTRUEenables use of ORACLE_HIVE and ORACLE_HDFS access drivers
_bigdata_offload_flagFALSEBigDataSQL offload flag
_bigram_dependency_percentage5Bigram dependency percentage
_bitmap_or_improvement_enabledTRUEcontrols extensions to partition pruning for general predicates
_block_change_tracking_filefile location for broker to reenable BCT
_block_dump_assertFALSEEncrypted block dump assert
_block_level_offload_high_lat_thresh40000High Latency Threshold for Block Level Offload operations
_block_sample_readahead_prob_threshold10controls readahead value during block sampling
_blockchainHeapSize0Set the heap size in bytes for blockchain
_blockchainTracing0Set tracing for blockchain
_blockchain_forced_offNOT_SETforce off blockchain
_blockchain_txn_apis_enabledTRUEIf true, the txn layer blockchain API'S kick in
_blockchain_txn_test_lvl0blockchain txn test lvl
_blockhm_flush_period3600Block heat map background flush period
_blocking_sess_graph_cache_sizeblocking session graph cache size in bytes
_blocks_per_cache_server16number of consecutive blocks per global cache server
_bloom_extent_size0bloom filter extent size in bytes
_bloom_filter_debug0debug level for bloom filtering
_bloom_filter_enabledTRUEenables or disables bloom filter
_bloom_filter_ratio35bloom filter filtering ratio
_bloom_filter_setops_enabledTRUEAllow bloom filter to be pushed through set operations
_bloom_filter_size0bloom filter vector size (in KB)
_bloom_folding_density16bloom filter folding density lower bound
_bloom_folding_enabledTRUEEnable folding of bloom filter
_bloom_folding_min0bloom filter folding size lower bound (in KB)
_bloom_max_size262144maximum bloom filter size (in KB)
_bloom_max_wait_time50bloom filter wait time upper bound (in ms)
_bloom_minmax_enabledTRUEenable or disable bloom min max filtering
_bloom_predicate_enabledTRUEenables or disables bloom filter predicate pushdown
_bloom_predicate_offloadTRUEenables or disables bloom filter predicate offload to cells
_bloom_pruning_enabledTRUEEnable partition pruning using bloom filtering
_bloom_pruning_setops_enabledTRUEAllow bloom pruning to be pushed through set operations
_bloom_pushing_max512bloom filter pushing size upper bound (in KB)
_bloom_pushing_total_max262144bloom filter combined pushing size upper bound (in KB)
_bloom_rm_filterFALSEremove bloom predicate in favor of zonemap join pruning predicate
_bloom_serial_filterONenable serial bloom filter on exadata
_bloom_sm_enabledTRUEenable bloom filter optimization using slave mapping
_bloom_use_shared_poolFALSEuse shared pool for bloom filter
_bloom_wait_on_racFALSEenables bloom filter (with hash hash distribution) wait on RAC
_boc_modeAUTOBroadcast-on-commit mode
_boc_rdma_wait_time0BOC RDMA busy wait time (microseconds)
_bps_sanity_checksFALSEenable BPS sanity checks
_branch_taggingTRUEenable branch tagging for distributed transaction
_broadcast_scn_mode1broadcast-on-commit scn mode
_broadcast_scn_wait_timeout10broadcast-on-commit scn wait timeout in centiseconds
_bsln_adaptive_thresholds_enabledTRUEAdaptive Thresholds Enabled
_bt_mmv_query_rewrite_enabledTRUEallow rewrites with multiple MVs and base tables
_buddy_instance1buddy instance control
_buddy_instance_num_read_buffers4Num of Read Buffers to scan everytime in Buddy Instance feature
_buddy_instance_scan_phase_threshold3Threshold (in secs) to let RMS0 construct the recovery set
_buddy_instance_start_rba_timeout9Time-out for re-computing Start RBA in Buddy Instance feature
_buffer_busy_wait_timeout100buffer busy wait time in centiseconds
_buffer_requests_to_drain5Buffer for requests to drain before planned failover
_buffered_message_spill_age300Buffered message spill age
_buffered_publisher_flow_control_threshold0Flow control threshold for buffered publishers except capture
_bufq_stop_flow_controlFALSEStop enforcing flow control for buffered queues
_bug30932330_forceopen_bind_undotbsFALSEone-hundred-and-forty-fifth spare parameter - boolean
_bug31789178_asm_quorum_hbFALSEAllow Quorum Disk Heartbeat
_bug31828999_lm_nodrm_service_pct95minimum nonsingleton service access percentage to disable drm
_bug31897178_kspdgctrleighty-fourth spare parameter - string
_bug31918168_keusp_stream_batch_sizeDEFAULTNumber of KEUSP buffers to flush in a stream batch
_bug31990919_keusp_max_num_alloc_bufDEFAULTMaximum number of KEUSP buffers in shared memory
_bug32093558_j0_deq_maxwait_time0eighth spare parameter - integer
_bug32093558_srvntfn_max_job_time180seventh spare parameter - integer
_bug32171622_asm_reloc_restart_timeout900csecs before signaling ORA-15424 when waiting for orphans
_bug32183142_hang_fast_track_progressing_sessionsFALSEHang Management fast-track progressing sessions enabled
_bug32498459_max_small_page_sga_size34359738368Maximum SGA size with small pages
_bug32533019_DON_for_update_enabledFALSEDefault on null for update feature enabled
_bug32823692_hang_parsing_hangs_resolution_interval0Hang Manager parsing hangs resolution interval
_build_deferred_mv_skipping_mvlog_updateTRUEDEFERRED MV creation skipping MV log setup update
_bump_highwater_mark_count0how many blocks should we allocate per free list on advancing HWM
_bwr_for_flushed_piTRUEif TRUE, generate a BWR for a flushed PI
_bypass_sensitive_contextFALSEbypass sensitive handling for specific SYS_CONTEXT() parameters
_bypass_srl_for_so_eorFALSEbypass SRL for S/O EOR logs
_bypass_xplatform_errorFALSEbypass datafile header cross-platform-compliance errors
_c3_external_scn_rejection_threshold_hours4464Lag in hours between max allowed SCN and an external SCN
_cache_fusion_pipelined_updatesTRUEConfigure smart fusion block transfer
_cache_fusion_pipelined_updates_enableEnable smart fusion block transfer
_cache_orl_during_openALLcache online logs
_cache_stats_monitorFALSEif TRUE, enable cache stats monitoring
_capability_simulateSimulate the capabilities for testing
_capture_buffer_size65536To set the size of the PGA I/O recording buffers
_capture_pgadep0capture statements at this pgadep
_capture_publisher_flow_control_threshold0Flow control threshold for capture publishers
_case_sensitive_logonTRUEcase sensitive logon enabled
_catalog_foreign_restoreFALSEcatalog foreign file restore
_causal_standby_wait_timeout20Causal standby wait timeout
_cdb_compatibleTRUECDB Compatible
_cdb_cross_container65535Debug flag for cross container operations
_cdb_disable_pdb_limitFALSECDB Compatible
_cdb_fleet_sync_timeout10Time in minutes to wait for sync of stub entry in CDB Fleet
_cdb_init_batch_size100Batch size for reading pdb info during CDB mount
_cdb_port0Port number for CDB Servlet
_cdb_rac_affinityTRUErac affinity for parallel cdb operations
_cdb_special_old_xplanTRUEdisplay old-style plan for CDB special fixed table
_cdb_spfile_inheritFALSEInherit CDB Spfile enabled/disabled in a PDB
_cdb_svlt_use_tcpsFALSEUse TCPS for CDB Servlet
_cdb_view_no_skip_migrateFALSEdo not skip OPEN MIGRATE PDBs from results of CONTAINERS()
_cdb_view_no_skip_restrictedFALSEdo not skip RESTRICTED mode PDBs from results of CONTAINERS()
_cdb_view_parallel_degree65535Parallel degree for a CDB view query
_cdb_view_prefetch_batch_size200Batch Size for Prefetch for a CDB view query
_cdb_view_rc_shelflife30Result Cache Shelflife for a CDB view query
_cdb_view_recursive_px_enabledTRUEenable parallelism of recursive SQL under CONTAINERS()
_cdc_subscription_ownerChange Data Capture subscription_owner
_cdmp_diagnostic_level2cdmp directory diagnostic level
_cell_fast_file_createTRUEAllow optimized file creation path for Cells
_cell_fast_file_restoreTRUEAllow optimized rman restore for Cells
_cell_file_format_chunk_size0Cell file format chunk size in MB
_cell_index_scan_enabledTRUEenable CELL processing of index FFS
_cell_materialize_all_expressionsFALSEForce materialization of all offloadable expressions on the cells
_cell_materialize_virtual_columnsTRUEenable offload of expressions underlying virtual columns to cells
_cell_metadata_compressionAUTOCell metadata compression strategy
_cell_object_expiration_hours24flashcache object expiration timeout
_cell_offload_backup_compressionTRUEenable offload of backup compression to cells
_cell_offload_capabilities_enabled1specifies capability table to load
_cell_offload_complex_processingTRUEenable complex SQL processing offload to cells
_cell_offload_expressionsTRUEenable offload of expressions to cells
_cell_offload_grand_totalTRUEallow offload of grand total aggregations
_cell_offload_hybrid_processingTRUEenable hybrid SQL processing offload to cells
_cell_offload_hybridcolumnarTRUEQuery offloading of hybrid columnar compressed tables to exadata
_cell_offload_predicate_reordering_enabledFALSEenable out-of-order SQL processing offload to cells
_cell_offload_sys_contextTRUEenable offload of SYS_CONTEXT evaluation to cells
_cell_offload_timezoneTRUEenable timezone related SQL processing offload to cells
_cell_offload_vector_groupbyTRUEenable SQL processing offload of vector group by
_cell_offload_vector_groupby_externalTRUEenable cell offload of vector group by with external tables
_cell_offload_vector_groupby_fact_keyTRUEenable cell offload of vector group by with fact grouping keys
_cell_offload_vector_groupby_forceFALSEforce offload of vector group by
_cell_offload_vector_groupby_withnojoinTRUEallow offload of vector group by without joins
_cell_offload_virtual_columnsTRUEenable offload of predicates on virtual columns to cells
_cell_range_scan_enabledTRUEenable CELL processing of index range scans
_cell_storidx_minmax_enabledTRUEenable Storage Index Min/Max optimization on the cells
_cell_storidx_modeEVACell Storage Index mode
_cellcache_clause_defaultDefault cellcache clause for new tables
_cellcache_default_flags2Default flags based on cellcache_clause_default
_cellcache_default_newFALSEForce cellcache on new tables
_cgs_allgroup_poll_time20000CGS DBALL group polling interval in milli-seconds
_cgs_big_group_enabledFALSEbig group membership support
_cgs_clscevents_dumpinterval600cgs clsce events statistics dump interval in seconds
_cgs_combine_css_events31CGS registration flags for CSS event combining
_cgs_comm_readiness_check1CGS communication readiness check
_cgs_dball_group_registrationlocalCGS DBALL group registration type
_cgs_dbgroup_poll_time600CGS DB group polling interval in milli-seconds
_cgs_health_check_in_reconfigFALSECGS health check during reconfiguration
_cgs_memberkill_from_rim_instanceFALSEallow a RIM instance to issue a CSS member kill
_cgs_msg_batch_size4096CGS message batch size in bytes
_cgs_msg_batchingTRUECGS message batching
_cgs_node_kill_escalationTRUECGS node kill escalation to CSS
_cgs_node_kill_escalation_wait0CGS wait time to escalate node kill to CSS in seconds
_cgs_os_level_connection_check1allow OS level connection and interface check
_cgs_os_level_connection_dynamicthreadTRUEallow oraping to spawn more threads than the default.
_cgs_os_level_connection_reqno0number of ping rqst to process at once, threads created
_cgs_publish_netinfo_collect_event_chmrcfg-half-timeout,rcfg-timeout,rcfg-done,idleconn-half-timeout,idleconn-timeout-imr,idleconn-cln,rcfg-begin,rcfg-pngchkdone,rcfg-memchgenable cgs publish collect_netinfo event to event stream for CHM
_cgs_publish_netinfo_collect_event_chmjfTRUEenable cgs publish collect_netinfo event to event stream for CHM with CHM'S JASON format
_cgs_publish_netinfo_collect_event_chmjf_batchsz0batch size of cgs events publishing to CHM in json format via clsce event stream
_cgs_publish_netinfo_collect_event_haipTRUEenable cgs publish collect_netinfo event to event stream for HAIP
_cgs_query_net_interfaceSCLSIapi to query network interface
_cgs_reconfig_extra_wait3CGS reconfiguration extra wait time for CSS in seconds
_cgs_reconfig_timeout0CGS reconfiguration timeout interval
_cgs_send_timeout300CGS send timeout value
_cgs_support_rim_discTRUErim instance disconnect and reconnect event support
_cgs_ticket_sendback50CGS ticket active sendback percentage threshold
_cgs_tickets1000CGS messaging tickets
_cgs_zombie_member_kill_wait20CGS zombie member kill wait time in seconds
_change_vector_buffers1Number of change vector buffers for media recovery
_change_vector_read_sample_ratio0Sample ratio of change vector read timestamp on ADG
_check_block_after_checksumFALSEcheck block before write irrespective of db_block_checking
_check_block_new_invariant_for_flashbackFALSEcheck block new invariant for flashback
_check_column_lengthTRUEcheck column length
_check_pdbid_in_redoFALSEEnable checking of pluggable database ID in redo
_check_ts_threshold0check tablespace thresholds
_child_read_ahead_dba_checkFALSEif TRUE, assert child read ahead dba to be continuous of parent
_cleanout_shrcur_buffersTRUEif TRUE, cleanout shrcur buffers
_cleanup_rollback_entries100no. of undo entries to apply per transaction cleanup
_cleanup_timeout150timeout value for PMON cleanup
_cleanup_timeout_flags0flags for PMON cleanup timeout
_clear_buffer_before_reuseFALSEAlways zero-out buffer before reuse for security
_clear_preserved_buffersTRUEClear preserved buffers before DB reopen after switchover
_cli_cachebktalloc100Percentage of memory to allocate
_client_enable_auto_unregisterFALSEenable automatic unregister after a send fails with timeout
_client_features_tracking_enableTRUEtrack client feature uage
_client_ntfn_cleanup_interval2400interval after which dead client registration cleanup task repeats
_client_ntfn_pinginterval75time between pings to unreachable notification clients
_client_ntfn_pingretries6number of times to ping unreachable notification clients
_client_ntfn_pingtimeout30000timeout to connect to unreachable notification clients
_client_result_cache_bypassFALSEbypass the client result cache
_client_result_cache_ramthresholdclient_result_cache_ramthreshold
_client_result_set_thresholdclient_result_set_threshold
_client_tstz_error_checkTRUEShould Client give error for suspect Timestamp with Timezone operations
_clone_during_splitTRUEif TRUE, clone buffer during index split
_clone_one_pdb_recoveryFALSERecover ROOT and only one PDB in clone database
_close_cached_open_cursorsFALSEclose cursors cached by PL/SQL at each commit
_close_deq_by_cond_cursFALSEClose Dequeue By Condition Cursors
_cloud_mandatory_profile_setupFALSEMandatory Profile Setup for Multitenant Cloud Environment
_cloud_namegsm cloud name
_cloud_service_sim0simulate cloud services in Database
_cloud_service_typecloud service type
_cloudsql_offload_enabledFALSEenable CloudSQL cell offload support
_cluster_database_instances1number of instances to use for sizing cluster db SGA structures
_cluster_flash_cache_slave_filecluster flash cache slave file for default block size
_cluster_flash_cache_slave_size0cluster flash cache slave file size for default block size
_cluster_instances_number4number of instances to calculate number of resource buckets
_cluster_libraryclsscluster library selection
_clusterwide_global_transactionsTRUEenable/disable clusterwide global transactions
_collapse_wait_historyFALSEcollapse wait history
_collect_tempundo_statsTRUECollect Statistics v$tempundostat
_collect_undo_statsTRUECollect Statistics v$undostat
_column_compression_factor0Column compression ratio
_column_elimination_offFALSEturn off predicate-only column elimination
_column_level_statsOFFTurn column statistics collection on or off
_column_stats_flush_interval60column-level statistics flush to disk interval
_column_stats_max_entries_per_stat5column-level statistics max entries saved per stat type
_column_stats_mem_limit10percentage of the max shared pool column-level statistics can use - internal
_column_tracking_level53column usage tracking
_common_data_view_enabledTRUEcommon objects returned through dictionary views
_common_user_prefixC##Enforce restriction on a prefix of a Common User/Role/Profile name
_compilation_call_heap_extent_size16384Size of the compilation call heaps extents
_complex_view_mergingTRUEenable complex view merging
_component_timingOracle parameter used for component tracking and timing
_composite_interval_partition_creation_opt_enabledTRUEwhen creating interval/auto list partitions, defer subpartition segment creation until a row for the subpartition is inserted
_compression_above_cache0number of recompression above cache for sanity check
_compression_advisor0Compression advisor
_compression_chain90percentage of chained rows allowed for Compression
_compression_compatibility21.0.0Compression compatibility
_con_map_sql_enforcementTRUEdisable container map SQL enforcement
_concurrency_chosen10what is the chosen value of concurrency
_connect_by_use_union_allTRUEuse union all for connect by
_connect_string_settings_after_logon_triggers0set connect string session settings after logon triggers
_connect_string_settings_unalterable0make connect string session settings unalterable
_connection_broker_handout_acceptFALSEconnection broker accepts prior to handout
_connection_broker_hostlocalhostconnection broker host for listen address
_connstr_test_param0connect string workload behavior spare param
_consensus_follower_election_timeout12000consensus follower's election timeout
_consensus_leader_heartbeat_interval6000consensus leader's heartbeat interval
_consensus_leader_maximum_heartbeatsconsensus leader's maximum heartbeats
_consensus_queue_maximum_elements10consensus queue maximum elements
_consensus_slaves_maximum_count5consensus slaves maximum count
_containers_multiple_ptn_keyTRUEenable multiple partition keys for container views
_controlfile_auto_convert_behaviourAUTO_CONVERTcontrolfile auto convert behavior for a mixed platform dataguard.
_controlfile_autobackup_delay300time delay (in seconds) for performing controlfile autobackups
_controlfile_backup_copy_checkTRUEenable check of the copied blocks during controlfile backup copy
_controlfile_block_size0control file block size in bytes
_controlfile_cell_flash_caching3Flash cache hint for control file accesses
_controlfile_enqueue_dumpFALSEdump the system states after controlfile enqueue timeout
_controlfile_enqueue_holding_time120control file enqueue max holding time in seconds
_controlfile_enqueue_holding_time_tracking_size0control file enqueue holding time tracking size
_controlfile_enqueue_timeout900control file enqueue timeout in seconds
_controlfile_section_init_sizecontrol file initial section size
_controlfile_section_max_expandcontrol file max expansion rate
_controlfile_split_brain_checkFALSECheck for a split-brain in distributed lock manager domain
_controlfile_update_checkOFFcontrolfile update sanity check
_controlfile_verify_on_mountFALSEVerify control file blocks on header error during mount
_convert_set_to_joinFALSEenables conversion of set operator to join
_coord_message_buffer0parallel recovery coordinator side extra message buffer size
_corrupted_rollback_segmentscorrupted undo segment list
_cost_equality_semi_joinTRUEenables costing of equality semi-join
_cp_del_free_sessTRUEconnection pool: delete free sessions when at PDB limit
_cp_del_free_sess_limit_secs1connection pool: delete free sessions time limit (in seconds)
_cp_num_hash_latchesconnection pool number of hash latches
_cpu_count_startup0Startup number of CPUs for this instance
_cpu_eff_thread_multiplierCPU effective thread multiplier
_cpu_to_io0divisor for converting CPU cost to I/O cost
_cpu_util_adj_force1force cpu util adjustment
_cpu_util_adj_target0cpu utilization adjustment target
_cputime_limit_parallel_fptr60CPU-time limit for for parallel first-pass recovery
_cr_grant_global_roleTRUEif TRUE, grant lock for CR requests when block is in global role
_cr_grant_local_roleAUTOturn 3-way CR grants off, make it automatic, or turn it on
_cr_grant_onlyFALSEif TRUE, grant locks when possible and do not send the block
_cr_multiblock_grant_onlyFALSEif TRUE, grant locks for multiblock read when possible and do not send the block
_cr_server_log_flushTRUEif TRUE, flush redo log before serving a CR buffer
_cr_trc_buf_size8192size of cr trace buffer
_crash_domain_on_exception0allow domain to exit for exceptions in any thread
_create_idx_from_constraintFALSEallow trigger to create index from constraint
_create_pdb_disable_mirror_readsFALSEDisable mirror reads during create pdb
_create_pdb_flashback_barrierFALSEforce flashback barrier for create pdb
_create_stat_segment0create ilm statistics segment
_create_table_in_any_clusterFALSEallow creation of table in a cluster not owned by the user
_cross_con_collectionFALSEenable cross container collection
_cross_con_remove_pushed_predsFALSEremove pushed predicates from query fetching across containers
_cross_con_row_countFALSEuse actual row count for cross container views
_crs_2phasebypasscrs 2phase
_cstats_enabledFALSECore stat monitoring enabled
_ctas_numfrags_hint0Hint for number of partition fragments to be loaded in a CTAS
_ctex_fk_copy_mode1Create table for exchange Copy mode for referential constraints
_ctx_doc_policy_stemsFALSEenable ctx_doc.policy_stems api
_cu_row_locking0CU row level locking
_cursor_bind_capture_area_size400maximum size of the cursor bind capture area
_cursor_bind_capture_interval900interval (in seconds) between two bind capture for a cursor
_cursor_cache_time900number of seconds a session cached cursor stay in cache.
_cursor_db_buffers_pinned407additional number of buffers a cursor can pin at once
_cursor_diagnostic_node_agedout_count100Number of cursor-sharing diagnostic nodes to retain before reuse
_cursor_features_enabled2Shared cursor features enabled bits.
_cursor_obsolete_threshold8192Number of cursors per parent before obsoletion.
_cursor_plan_enabledTRUEenable collection and display of cursor plans
_cursor_plan_hash_version1version of cursor plan hash value
_cursor_plan_unparse_enabledTRUEenables/disables using unparse to build projection/predicates
_cursor_reload_failure_threshold0Number of failed reloads before marking cursor unusable
_cursor_runtimeheap_memlimit5242880Shared cursor runtime heap memory limit
_cursor_stats_enabledTRUEEnable cursor stats
_cvw_enable_weak_checkingTRUEenable weak view checking
_cvw_examine_tables_in_from_list_subqryTRUEexamine tables in from list subqueries
_data_transfer_cache_bc_perc_x100500Percentange * 100 of buffer cache to transfer to data transfer cache
_data_warehousing_scan_buffersTRUEif TRUE, enable data warehousing scan buffers
_data_warehousing_scan_flash_buffersFALSEif TRUE, enable data warehousing scan flash buffers
_data_warehousing_serial_scanTRUEif TRUE, enable data warehousing serial scans
_datafile_cowFALSEUse copy on write snapshot for the renamed file
_datafile_create_min_wait_time0Minimum wait time for standby during data file creation
_datafile_create_wait_time0Wait time for standby during data file creation
_datafile_open_errors_crash_instanceTRUEdatafile open errors crash instance
_datafile_write_errors_crash_instanceTRUEdatafile write errors crash instance
_datapump_bypass_tstz_checkFALSEBypass Data Pump TSTZ version checking during import.
_datapump_compressbas_buffer_size0specifies buffer size for BASIC compression algorithm
_datapump_conv_pga_lim0pga limit for Data Pump conventional path bind array size
_datapump_gather_stats_on_loadFALSEGather table statistics during Data Pump load rather thanimporting statistics from the dump file. This should be set to TRUE in the lockdown profile in a DWCS environment.
_datapump_hide_cdb_warningFALSEHide Data Pump warning for CDBROOT and PDBSEED
_datapump_inherit_svcnameTRUEInherit and propagate service name throughout job
_datapump_metadata_buffer_size131072specifies buffer size for metadata file I/O
_datapump_tabledata_buffer_size262144specifies buffer size for table data file I/O
_db_16k_cache_xmem_size0Size of 16k buffer pool on extended cache
_db_16k_flash_cache_fileflash cache file for 16k block size
_db_16k_flash_cache_size0flash cache size for _db_16k_flash_cache_file
_db_2k_cache_xmem_size0Size of 2k buffer pool on extended memory
_db_2k_flash_cache_fileflash cache file for 2k block size
_db_2k_flash_cache_size0flash cache size for _db_2k_flash_cache_file
_db_32k_cache_xmem_size0Size of 32k buffer pool on extended memory
_db_32k_flash_cache_fileflash cache file for 32k block size
_db_32k_flash_cache_size0flash cache size for _db_32k_flash_cache_file
_db_4k_cache_xmem_size0Size of 4k buffer pool on extended cache
_db_4k_flash_cache_fileflash cache file for 4k block size
_db_4k_flash_cache_size0flash cache size for _db_4k_flash_cache_file
_db_8k_cache_xmem_size0Size of 8k buffer pool on extended cache
_db_8k_flash_cache_fileflash cache file for 8k block size
_db_8k_flash_cache_size0flash cache size for _db_8k_flash_cache_file
_db_aging_cool_count1Touch count set when buffer cooled
_db_aging_freeze_crFALSEMake CR buffers always be too cold to keep in cache
_db_aging_hot_criteria2Touch count which sends a buffer to head of replacement list
_db_aging_stay_count0Touch count set when buffer moved to head of replacement list
_db_aging_touch_time3Touch count which sends a buffer to head of replacement list
_db_always_check_system_tsTRUEAlways perform block check and checksum for System tablespace
_db_block_adjcheckTRUEadjacent cache buffer checks - low blkchk overwrite parameter
_db_block_adjchk_level0adjacent cache buffer check level
_db_block_align_direct_readTRUEAlign Direct Reads
_db_block_bad_write_checkFALSEenable bad write checks
_db_block_buffers131186Number of database blocks cached in memory: hidden parameter
_db_block_cache_history_lruFALSEbuffer header tracing for lru operations
_db_block_cache_protectfalseprotect database blocks (for debugging only)
_db_block_cache_protect_internal0protect database blocks (for internal use only)
_db_block_check_for_debugFALSECheck more and dump block before image for debugging
_db_block_check_objtypTRUEcheck objd and typ on cache disk read
_db_block_chunkify_ncmbrFALSEchunkify noncontig multi block reads
_db_block_corruption_recovery_threshold5threshold number of block recovery attempts
_db_block_do_full_mbreadsFALSEdo full block read even if some blocks are in cache
_db_block_hash_buckets524288Number of database block hash buckets
_db_block_hash_latches4096Number of database block hash latches
_db_block_header_guard_level0number of extra buffer headers to use as guard pages
_db_block_hi_priority_batch_size0Fraction of writes for high priority reasons
_db_block_iterations_for_rm2000number of blocks to reduce every iteration for RM
_db_block_known_clean_pct2Initial Percentage of buffers to maintain known clean
_db_block_lru_latches36number of lru latches
_db_block_max_cr_dba6Maximum Allowed Number of CR buffers per dba
_db_block_max_scan_pct40Percentage of buffers to inspect when looking for free
_db_block_med_priority_batch_size0Fraction of writes for medium priority reasons
_db_block_numa1Number of NUMA nodes
_db_block_prefetch_fast_longjumps_enabledTRUEBatched IO enable fast longjumps
_db_block_prefetch_limit0Prefetch limit in blocks
_db_block_prefetch_override0Prefetch force override in blocks
_db_block_prefetch_private_cache_enabledTRUEBatched IO enable private cache
_db_block_prefetch_quota10Prefetch quota as a percent of cache size
_db_block_prefetch_skip_reading_enabledTRUEBatched IO enable skip reading buffers
_db_block_prefetch_wasted_threshold_perc2Allowed wasted percent threshold of prefetched size
_db_block_scandepth_for_rm20number of blocks to reduce every iteration for RM
_db_block_table_scan_buffer_size4194304Size of shared table scan read buffer
_db_block_temp_redoFALSEgenerate redo for temp blocks
_db_block_trace_protectFALSEtrace buffer protect calls
_db_block_vlm_checkFALSEcheck for mapping leaks (debugging only)
_db_block_vlm_leak_threshold4threshold for allowable mapping leaks
_db_blocks_per_hash_latchNumber of blocks per hash latch
_db_bt_cache_only_readmostly_obj_on_roiFALSEif TRUE, ABTC only caches read mostly objects on ROI
_db_cache_advice_hash_latch_multiple16cache advisory hash latch multiple
_db_cache_advice_max_size_factor2cache advisory maximum multiple of current size to similate
_db_cache_advice_sample_factor4cache advisory sampling factor
_db_cache_advice_sanity_checkFALSEcache simulation sanity check
_db_cache_advice_size_submultiple10cache advisory size submultiple
_db_cache_block_read_stack_trace0dump short call stack for block reads
_db_cache_block_read_stack_trace_where10dump short call stack for block reads just for where1
_db_cache_block_read_stack_trace_where20dump short call stack for block reads just for where2
_db_cache_block_read_stack_trace_where30dump short call stack for block reads just for where3
_db_cache_crx_checkFALSEcheck for costly crx examination functions
_db_cache_max_sz0
_db_cache_miss_check_lesFALSEcheck LEs after cache miss
_db_cache_mman_latch_checkFALSEcheck for wait latch get under MMAN ops in kcb
_db_cache_pmem_confidence_try0DB Cache PMEM buffer promote attempts for greater confidence
_db_cache_pmem_promotion_touch_rate_reset_interval300DB Cache PMEM promotion touch rate reset interval in sec
_db_cache_pmem_promotion_touch_rate_threshold_time30DB Cache PMEM promotion touch rate threshold time in sec
_db_cache_pmem_touch_rate_compare_per95DB Cache PMEM buffer touch rate additive percentage when comparingagainst dram touch rate
_db_cache_pmemp_len10000DB Cache PMEM promotion list max length
_db_cache_pre_warmTRUEBuffer Cache Pre-Warm Enabled : hidden parameter
_db_cache_process_cr_pin_max2147483647maximum number of cr pins a process may have
_db_cache_silicon_secured_memoryTRUEenable silicon secured memory
_db_cache_wait_debug0trace new kslwaits
_db_cache_xmem_promotion_algo_chosen38DB Cache Xmem/Pmem promotion algo
_db_cache_xmem_size0Size of extended memory data area for buffer cache DEFAULT pool
_db_change_notification_enableTRUEenable db change notification
_db_check_cell_hintsFALSE
_db_disable_temp_encryptionFALSEDisable Temp Encryption for Spills
_db_discard_lost_masterkeyFALSEdiscard lost masterkey handles
_db_dump_from_disk_and_efc0dump contents from disk and efc
_db_dw_scan_adaptive_coolingFALSEif TRUE, enable adaptive DW scan cooling
_db_dw_scan_max_shadow_count5DW Scan adaptive cooling max shadow count
_db_dw_scan_obj_cooling_factor500DW Scan object cooling factor to cool all temperatures
_db_dw_scan_obj_cooling_interval100DW Scan object cooling interval in number of scans, seconds, or pct of cache size
_db_dw_scan_obj_cooling_policyCACHE_SIZEDW scan objtect cooling policy
_db_dw_scan_obj_warming_increment1000DW Scan object warming increment when an object is scanned
_db_fast_obj_checkFALSEenable fast object drop sanity check
_db_fast_obj_ckptTRUEenable fast object checkpoint
_db_fast_obj_truncateTRUEenable fast object truncate
_db_file_direct_io_count1048576Sequential I/O buf size
_db_file_exec_read_count128multiblock read count for regular clients
_db_file_format_io_buffers4Block formatting I/O buf count
_db_file_noncontig_mblock_read_count11number of noncontiguous db blocks to be prefetched
_db_file_optimizer_read_count8multiblock read count for regular clients
_db_flash_cache_disable_write_batchsize4096Flash cache disable writes processing batchsize
_db_flash_cache_encryptionFALSESet _db_flash_cache_encryption to enable flash cache encryption
_db_flash_cache_force_replenish_limit8Flash cache force replenish lower limit in buffers
_db_flash_cache_keep_limit80Flash cache keep buffer upper limit in percentage
_db_flash_cache_max_latency400Flash cache maximum latency allowed in 10 milliseconds
_db_flash_cache_max_outstanding_writes32Flash cache maximum outstanding writes allowed
_db_flash_cache_max_read_retry10Flash cache max read retry
_db_flash_cache_max_slow_io3Flash cache maximum slow io allowed
_db_flash_cache_slow_io_adjustment_interval3600Decrement interval
_db_flash_cache_write_limit1Flash cache write buffer upper limit in percentage
_db_flashback_iobuf_size1Flashback IO Buffer Size
_db_flashback_log_min_size16777216Minimum flashback database log size in bytes
_db_flashback_log_min_total_space0Minimum flashback database log total space in bytes
_db_flashback_num_iobuf64Flashback Number of IO buffers
_db_full_cachingTRUEenable full db implicit caching
_db_full_db_cache_diff_pct5Cache at least this % larger than DB size for full db caching
_db_generate_dummy_masterkeyFALSEif TRUE, use old havior and generate dummy master key
_db_handles3200System-wide simultaneous buffer operations
_db_handles_cached10Buffer handles cached each process
_db_hot_block_trackingFALSEtrack hot blocks for hash latch contention
_db_imoltp_hashidx_force_nonctg0kcbw imoltp hash index force non contig granules
_db_index_block_checkingTRUEindex block checking override parameter
_db_initial_cachesize_create_mb256size of cache created at startup
_db_keep_cache_xmem_size0Size of KEEP buffer pool for standard block size buffers on extended memory
_db_l2_tracing0flash cache debug tracing
_db_large_dirty_queue25Number of buffers which force dirty queue to be written
_db_link_sources_trackingTRUEenable/disable database link source tracking
_db_lost_write_checking2Enable scn based lost write detection mechanism
_db_lost_write_corrupt_blockFALSEallow corruption for lost write
_db_lost_write_tracingFALSEEnable _db_lost_write_checking tracing
_db_minimum_auxsize_percent0min percent of aux buffers to be maintained before using aux2
_db_mttr_adviceONMTTR advisory
_db_mttr_partitions0number of partitions for MTTR advisory
_db_mttr_sample_factor64MTTR simulation sampling factor
_db_mttr_sim_targetMTTR simulation targets
_db_mttr_sim_trace_size256MTTR simulation trace size
_db_mttr_trace_to_alertFALSEdump trace entries to alert file
_db_noarch_disble_optimFALSEImage redo logging (NOARCHIVEMODE)
_db_num_evict_waitevents16384number of evict wait events
_db_num_gsm0database number in gsm dbpool
_db_nvm_promotion_deferred_tchcnt195touch count threshold which allows deferred background based nvm buffer promotion
_db_obj_enable_ksrTRUEenable ksr in object checkpoint/reuse
_db_percent_hot_default50Percent of default buffer pool considered hot
_db_percent_hot_keep0Percent of keep buffer pool considered hot
_db_percent_hot_recycle0Percent of recycle buffer pool considered hot
_db_percpu_create_cachesize2size of cache created per cpu in deferred cache create
_db_pmem_auto_resize_interval10PMEM auto resize interval in minutes
_db_pmem_direct_map_size0Size of direct mappable PMEM buffer cache
_db_prefetch_histogram_statisticsFALSEmaintain prefetch histogram statistics in x$kcbprfhs
_db_recovery_temporal_file_destdefault database recovery temporal file location
_db_recycle_cache_xmem_size0Size of Recycle buffer pool for standard block size buffers on extended memory
_db_replay_security_configDatabase Replay Security Configuration
_db_required_percent_fairshare_usage10percent of fairshare a processor group should always use
_db_row_overlap_checkingTRUErow overlap checking override parameter for data/index blocks
_db_shadow_lost_write_protectNOT_SETalter shadow lost write detection for PDB
_db_todefer_cache_createTRUEbuffer cache deferred create
_db_writer_chunk_writes0Number of writes DBWR should wait for
_db_writer_coalesce_area_size4194304Size of memory allocated to dbwriter for coalescing writes
_db_writer_coalesce_encrypted_buffersTRUECoalecsing for encrypted buffers
_db_writer_coalesce_write_limit131072Limit on size of coalesced write
_db_writer_flush_imuTRUEIf FALSE, DBWR will not downgrade IMU txns for AGING
_db_writer_histogram_statisticsFALSEmaintain dbwr histogram statistics in x$kcbbhs
_db_writer_max_writes0Max number of outstanding DB Writer IOs
_db_writer_nomemcopy_coalesceFALSEEnable DBWR no-memcopy coalescing
_db_writer_verify_writesFALSEEnable lost write detection mechanism
_db_xmem_cache_encryptionTRUESet _db_xmem_cache_encryption to enable XMEM cache encryption
_db_xmem_hot_switch_criteria195Xmem/Pmem buffer touch count which makes this buffer candidate of switching to DRAM buffer
_dbcomp_maxdump100Maximum # of dumped blocks per datafile
_dbcomp_msg_ver1database block compare message version
_dbfs_modify_implicit_fetchTRUEDBFS Link allows implicit fetch on modify - only on SecureFiles
_dbfs_symlink_path_prefixTRUEdisallow symbolic link creation in dbfs outside path_prefix
_dbg_proc_startupFALSEdebug process startup
_dbg_scan0generic scan debug
_dbms_sql_security_level1Security level in DBMS_SQL
_dbmsumf$$1xUMF Configuration
_dbmsumf$$2xUMF Configuration
_dbmsumf$$3xUMF Configuration
_dbmsumf$$nnUMF Configuration
_dbmsumf$$pUMF Configuration
_dbnest_enableNONEdbNest enable
_dbnest_pdb_fs_confPDB Filesystem configuration
_dbnest_pdb_fs_typeDEFAULTPDB FS Type
_dbnest_pdb_scm_confPDB SCM configuration
_dbnest_pdb_scm_levelSTRICT1PDB SCM Level
_dbnest_resource_opts0dbNest - resource options
_dbnest_skip_fed_rootTRUEFed root is skipped so CDB nest is root of all pdbs
_dbnest_stage_dirStaging directory configuration
_dbop_enabled1Any positive number enables automatic DBOP monitoring. 0 is disabled
_dbopen_breakpointnoneALTER DATABASE OPEN codepath breakpoint
_dbpool_namegsm database pool name
_dbreplay_feature_controlDatabase Replay Feature Control
_dbreplay_mpk_keyDatabase Replay Package Key
_dbrm_dynamic_threshold17302504DBRM dynamic threshold setting
_dbrm_num_runnable_list0Resource Manager number of runnable list per NUMA node
_dbrm_quantumDBRM quantum
_dbrm_runchk32798000DBRM kskrunstatechk thresholds
_dbrm_short_wait_us300Resource Manager short wait length
_dbwr_async_ioTRUEEnable dbwriter asynchronous writes
_dbwr_flashlock_shrink_limit0limit to shrink le to flash lock per dbwr iteration
_dbwr_nowrite_assert_interval7200dbwriter assert interval after no write seconds
_dbwr_nwp_assert_interval1800dbwriter no write permission assert interval after no write seconds
_dbwr_scan_interval300dbwriter scan interval
_dbwr_stall_write_detection_interval900dbwriter stall write detection interval
_dbwr_tracing0Enable dbwriter tracing
_dd_validate_remote_locksTRUEGES deadlock detection validate remote locks
_dde_flood_control_initTRUEInitialize Flood Control at database open
_ddlapply_enableFALSEDDL VIA APPLY Enable
_dead_process_scan_interval60PMON dead process scan interval (in seconds)
_deadlock_diagnostic_level2automatic deadlock resolution diagnostics level
_deadlock_record_to_alert_logTRUErecord resolved deadlocks to the alert log
_deadlock_resolution_incidents_alwaysFALSEcreate incidents when resolving any deadlock?
_deadlock_resolution_incidents_enabledTRUEcreate incidents during deadlock resolution
_deadlock_resolution_level1automatic deadlock resolution level
_deadlock_resolution_min_wait_timeout_secs60the minimum wait timeout required for deadlock resolution
_deadlock_resolution_signal_process_thresh_secs60the amount of time given to process a deadlock resolution signal
_dedicated_server_poll_count10dedicated server poll count
_dedicated_server_post_waitFALSEdedicated server post/wait
_dedicated_server_post_wait_callFALSEdedicated server post/wait call
_default_encrypt_alg0default encryption algorithm
_default_ini_trans_index0Default value of INI_TRANS enforced by DWCS lockdown for indexes
_default_ini_trans_table0Default value of INI_TRANS enforced by DWCS lockdown for tables
_default_non_equality_sel_checkTRUEsanity check on default selectivity for like/range predicate
_default_oracle_fs_typeofsdefault file system type for an oracle file system
_default_pct_free0Default value of PCT_FREE enforced by DWCS lockdown
_default_serviceTRUERun default service
_defer_eor_orl_arch_for_soTRUEdefer EOR ORL archival for switchover
_defer_log_boundary_ckptTRUEdefer media recovery checkpoint at log boundary
_defer_log_count100Number of log boundaries media recovery checkpoint lags behind
_defer_rcv_during_sw_to_sbyFALSEDefer recovery during switchover to standby
_defer_rcv_pdb_attachTRUEDefer PDB domain attach in instance recovery
_defer_rewrap_controlfile_key_historyFALSEif TRUE, defer rewrap control file TS keys under next PDB open
_defer_sga_alloc_chunk_size1073741824Chunk size for defer sga allocation
_defer_sga_enabledFALSEEnable deferred shared memory allocation for SGA
_defer_sga_min_spsz_at_startup53687091200Minimum shared pool size at startup with deferred sga enabled
_defer_sga_min_total_defer_segs_sz107374182400Minimum total deferred segs size for defer sga allocation
_defer_sga_test_alloc_intv0SA** sleeps for N secs before allocating a deferred segment
_defer_while_patching0Session should be deferred if patching is secheduled
_deferred_constant_folding_modeDEFAULTDeferred constant folding mode
_deferred_log_dest_is_validTRUEconsider deferred log dest as valid for log deletion (TRUE/FALSE)
_deferred_seg_in_seedTRUEEnable Deferred Segment Creation in Seed
_delay_index_maintainTRUEdelays index maintenance until after MV is refreshed
_delete_ghost_dataFALSETest delete ghost data
_deq_execute_reset_time30deq execute reset time
_deq_ht_child_latches8deq ht child latches
_deq_ht_max_elements100000deq ht max elements
_deq_large_txn_size25000deq large txn size
_deq_log_array_size10000deq log array size
_deq_max_fetch_count10deq max fetch count
_deq_maxwait_time0Change wait times between dequeue calls
_desired_readmem_rate90The desired percentage of redo reading from memory
_df_hist_offl_overrideFALSEAllow update of keep offline bit in datafile history record
_dg_broker_trace_leveldata guard broker trace level
_dg_cf_check_timer15Data Guard controlfile check timer
_dg_corrupt_redo_log0Corrupt redo log validation during archivals
_dgb_dgpdb_appstDGPDBs with apply state off
_dgpdb_file_name_convertdatafile name convert patterns and strings for per PDB standby
_dgpdb_standby_controlfile_namedgpdb_temp_copy_cf_%u_stby_%u_%u.cfa name template with three %u's for DGPDB standby controlfile
_diag_adl_dyn_allocTRUEEnable Diag Alert Dynamic Allocation
_diag_adr_auto_purgeTRUEEnable/disable ADR MMON Auto Purging
_diag_adr_enabledTRUEParameter to enable/disable Diag ADR
_diag_adr_test_param0Test parameter for Diagnosability
_diag_adr_trace_dest/u01/app/oracle/diag/rdbms/orcl21c/orcl21c/tracediagnosability trace directory path
_diag_alert_root_annotateFALSEEnable annotation for alert log entries from root
_diag_arb_before_killFALSEdump diagnostics before killing unresponsive ARBs
_diag_attn_log_format_errorAttention Log Error Entry format
_diag_attn_log_format_standardAttention Log Standard Entry format
_diag_backward_compatTRUEBackward Compatibility for Diagnosability
_diag_cc_enabledTRUEParameter to enable/disable Diag Call Context
_diag_cdb_loggingshortFormat for CDB Annotation
_diag_conf_cap_enabledTRUEParameter to enable/disable Diag Configuration Capture
_diag_crashdump_level10parameter for systemstate dump level, used by DIAG during crash
_diag_daemonTRUEstart DIAG daemon
_diag_dde_async_age_limit300diag dde async actions: message age limit (in seconds)
_diag_dde_async_cputime_limit300diag dde async actions: action cputime limit (in seconds)
_diag_dde_async_mode1diag dde async actions: dispatch mode
_diag_dde_async_msg_capacity1024diag dde async actions: message buffer capacity
_diag_dde_async_msgs50diag dde async actions: number of preallocated message buffers
_diag_dde_async_process_rate5diag dde async actions: message processing rate - per loop
_diag_dde_async_runtime_limit900diag dde async actions: action runtime limit (in seconds)
_diag_dde_async_slaves5diag dde async actions: max number of concurrent slave processes
_diag_dde_enabledTRUEenable DDE handling of critical errors
_diag_dde_fc_enabledTRUEParameter to enable/disable Diag Flood Control
_diag_dde_fc_implicit_time0Override Implicit Error Flood Control time parameter
_diag_dde_fc_macro_time0Override Macro Error Flood Control time parameter
_diag_dde_inc_proc_delay1The minimum delay between two MMON incident sweeps (minutes)
_diag_diagnosticsTRUETurn off diag diagnostics
_diag_dump_request_debug_level1DIAG dump request debug level (0-2)
_diag_dump_timeout30timeout parameter for SYNC dump
_diag_enable_startup_eventsFALSEenable events in instance startup notifiers
_diag_hm_rc_enabledTRUEParameter to enable/disable Diag HM Reactive Checks
_diag_hm_tc_enabledFALSEParameter to enable/disable Diag HM Test(dummy) Checks
_diag_large_packetsTRUEDIA* large packets support
_diag_patch_cap_enabledTRUEParameter to enable/disable Diag Patch Configuration Capture
_diag_pdb_control0DIAG PDB Space Management Control Parameter
_diag_pdb_purge_target90Controls target percentage for ADR PDB Auto Purge Operation
_diag_pdb_purge_threshold97Controls threshold for ADR PDB Auto Purge Operation
_diag_proc_enabledTRUEenable hung process diagnostic API
_diag_proc_max_time_ms30000hung process diagnostic API max wait time in milliseconds
_diag_proc_stack_capture_type1hung process diagnostic API stack capture type
_diag_test_seg_reinc_modeFALSESets trace segmentation to be in reincarnation mode
_diag_uts_control0UTS control parameter
_diag_verbose_error_on_init0Allow verbose error tracing on diag init
_diag_xm_enabledFALSEIf TRUE, DIAG allows message exchanges across DB/ASM boundary
_dimension_skip_nullTRUEcontrol dimension skip when null feature
_direct_io_skip_cur_slot_on_errorTRUESkip current slot on error
_direct_io_slots0number of slots for direct path I/O
_direct_io_via_mapped_pmemTRUEif TRUE, direct path I/O will attempt to memory map files on PMEM
_direct_io_wslots0number of write slots for direct path I/O
_direct_path_insert_features0disable direct path insert features
_direct_read_decision_statistics_drivenTRUEenable direct read decision based on optimizer statistics
_dirty_appliance_modeFALSEEnable appliance mode even on non-appliance
_disable_12751FALSEdisable policy timeout error (ORA-12751)
_disable_12cbigfileFALSEDIsable Storing ILM Statistics in 12cBigFiles
_disable_active_influx_moveFALSEdisable active influx move during parallel media recovery
_disable_actualization_for_grantFALSEdisable actualization of editioned objects on grant
_disable_adaptive_shrunk_aggregationFALSEadaptive shrunk aggregation
_disable_adp_adj_buf_checkFALSENo adjacent buffer check for ADP
_disable_appliance_checkFALSEDisable appliance-specific code
_disable_appliance_partneringFALSEDisable appliance partnering algorithms
_disable_asm_audit_feat0disable ASM audit features
_disable_autotune_gtxFALSEdisable autotune global transaction background processes
_disable_block_checkingFALSEdisable block checking at the session level
_disable_block_corruption_trackFALSEdisable block corruption tracking
_disable_cdb_view_rc_invalidationFALSEdisable Result Cache invalidation for CDB View results
_disable_cell_optimized_backupsFALSEdisable cell optimized backups
_disable_con_recurse_queuingTRUEdisable parallel statement queuing for containers() recursive SQL
_disable_cpu_checkFALSEdisable cpu_count check
_disable_cursor_sharingFALSEdisable cursor sharing
_disable_data_block_check_after_decryptFALSEif TRUE, disable data block check after decryption
_disable_datalayer_samplingFALSEdisable datalayer sampling
_disable_dblink_optimTRUEdisable intra CDB dblink optimizations
_disable_def_seg_update0Disable deferred seg$ update
_disable_destructive_patch_operationTRUEIs destructive operation allowed in a patch
_disable_dict_check_pdb_openFALSEdisable PDB pseudo open for dictionary check purpose
_disable_directory_link_checkFALSEDisable directory link checking
_disable_duplex_linkTRUETurn off connection duplexing
_disable_duplicate_service_warningFALSEdisable listener warning for duplicate service
_disable_fast_aggregationFALSEfast aggregation
_disable_fast_validateFALSEdisable PL/SQL fast validation
_disable_fastopenFALSEDo Not Use Fastopen
_disable_fba_qrw0disable flashback archiver query rewrite
_disable_fba_wpr0disable flashback archiver wait for prepared transactions
_disable_file_locksFALSEdisable file locks for control, data, redo log files
_disable_file_resize_loggingFALSEdisable file resize logging to alert log
_disable_flashback_archiver0disable flashback archiver
_disable_flashback_recyclebin_optTRUEDon't use the Flashback Recyclebin optimization
_disable_flashback_wait_callbackFALSEDisable flashback wait callback
_disable_foreign_scn_adjustFALSEDisable foreign SCN adjustment
_disable_function_based_indexFALSEdisable function-based index matching
_disable_gvaq_cacheFALSEDisable cache
_disable_hcc_array_insertFALSETRUE - enable conventional inserts into HCC CUs
_disable_health_checkFALSEDisable Health Check
_disable_highres_ticksFALSEdisable high-res tick counter
_disable_ilm_internalFALSEForce disable internal ilm stats and drop ilm segment
_disable_image_checkFALSEDisable Oracle executable image checking
_disable_implicit_row_movementFALSEdisable implicit row movement
_disable_incremental_checkpointsFALSEDisable incremental checkpoints for thread recovery
_disable_incremental_recovery_ckptFALSEDisable incremental recovery checkpoint mechanism
_disable_index_block_prefetchingFALSEdisable index block prefetching
_disable_inheritpriv_grant_publicFALSEDisable inherit privilege grant to PUBLIC for newly created users
_disable_initial_block_compressionFALSEdisable initial block compression
_disable_instance_params_checkFALSEdisable instance type check for ksp
_disable_interface_checkingFALSEdisable interface checking at startup
_disable_kcb_flashback_blocknew_optFALSEDisable KCB flashback block new optimization
_disable_kcbhxor_osdFALSEdisable kcbh(c)xor OSD functionality
_disable_kcbl_flashback_blocknew_optFALSEDisable KCBL flashback block new optimization
_disable_kgghshcrc32_osdFALSEdisable kgghshcrc32chk OSD functionality
_disable_last_successful_login_timeFALSEDisable writing Last Successful Login Time to USER$
_disable_loggingFALSEDisable logging
_disable_lostwrite_tablespace_alertsFALSEdisable tablespace alerts for LOSTWRITE tablespaces
_disable_mandatory_profile_oncloneFALSEDisable Mandatory Profile check on clone of a PDB
_disable_marking_noopsFALSEDon't mark any captured statements as no-ops.
_disable_metrics_group0Disable Metrics Group (or all Metrics Groups)
_disable_modsvc_refreshdisable modify service cache refresh
_disable_multiple_block_sizesFALSEdisable multiple block size support (for debugging)
_disable_odmFALSEdisable odm feature
_disable_oradebug_commandsrestricteddisable execution of certain categories of oradebug commands
_disable_orphan_pdb_recoveryFALSEDisable PDB PITR/FB to orphan PDB incarnation
_disable_os_time_pageFALSEdisable OS time page
_disable_parallel_conventional_loadFALSEDisable parallel conventional loads
_disable_pdb_space_checkFALSEDisable pdb storage usage check in the session
_disable_primary_bitmap_switchFALSEdisable primary bitmap switch
_disable_ptl_replayFALSEIs PTL replay disabled during Application Sync
_disable_read_only_open_dict_checkFALSEDisable read-only open dictionary check
_disable_rebalance_space_checkFALSEdisable space usage checks for storage reconfiguration
_disable_recovery_read_skipFALSEDisable the read optimization during media recovery
_disable_rolling_patch0Disable Rolling Patch Feature
_disable_sample_io_optimFALSEdisable row sampling IO optimization
_disable_savepoint_resetFALSEdisable the fix for bug 1402161
_disable_selftune_checkpointingFALSEDisable self-tune checkpointing
_disable_sensitive_internalFALSEdisable internal SQL from showing sensitive information
_disable_sga_filedelFALSEdisable deletion of files used for SGA
_disable_storage_typeFALSEDisable storage type checks
_disable_streams_diagnostics0streams diagnostics
_disable_streams_pool_auto_tuningFALSEdisable streams pool auto tuning
_disable_sun_rsmTRUEDisable IPC OSD support for Sun RSMAPI
_disable_system_state4294967294disable system state dump
_disable_system_state_wait_samplesFALSEDisable system state dump - wait samples
_disable_system_tablespaces_enc_enforcementFALSEif TRUE, disable system tablespaces encryption enforcement
_disable_temp_tablespace_alertsFALSEdisable tablespace alerts for TEMPORARY tablespaces
_disable_thread_internal_disableFALSEDisable thread internal disable feature
_disable_txn_alert0disable txn layer alert
_disable_undo_tablespace_alertsFALSEdisable tablespace alerts for UNDO tablespaces
_disable_wait_stateDisable wait state
_discard_cmn_ddl_in_pdb_errFALSEDiscard error when Common DDL is attempted in PDB
_discrete_transactions_enabledFALSEenable OLTP mode
_disk_sector_size_overrideFALSEif TRUE, OSD sector size could be overridden
_diskmon_pipe_nameDiSKMon skgznp pipe name
_disksize_binary_searchFALSEif set, perform binary search to get disk size if IOCTL fails
_dispatcher_listen_on_vipFALSEDetermines if dispatcher listens on VIP if no HOST is supplied
_dispatcher_rate_scalescale to display rate statistic (100ths of a second)
_dispatcher_rate_ttltime-to-live for rate statistic (100ths of a second)
_distinct_agg_optimization_gsetsCHOOSEUse Distinct Aggregate Optimization for Grouping Sets
_distinct_view_unnestingFALSEenables unnesting of in subquery into distinct view
_distributed_recovery_connection_hold_time200number of seconds RECO holds outbound connections open
_disttxn_for_queriesTRUEremote queries start distributed transaction
_dlm_cache_warmup_slaves2Number of DLM cache warm up slaves
_dlm_stats_collect1DLM statistics collection(0 = disable, 1 = enable (default))
_dlm_stats_collect_du_limit3000DLM statistics collection disk updates per slot
_dlm_stats_collect_mode6DLM statistics collection mode
_dlm_stats_collect_slot_interval60DLM statistics collection slot interval (in seconds)
_dlmtraceTrace string of global enqueue type(s)
_dm_dmf_details_compatibility12.1.0set dm dmf details compatibility version
_dm_enable_legacy_dmf_output_typesFALSErevert dmf output types to pre-12.1.0.1
_dm_inmemory_threshold1000000In-memory cardinality threshold
_dm_max_chunk_size2000Data Mining Max Chunk Size
_dm_max_shared_pool_pct5max percentage of the shared pool to use for a mining model
_dml_batch_error_limit0number or error handles allocated for DML in batch mode
_dml_frequency_trackingFALSEControl DML frequency tracking
_dml_frequency_tracking_advanceTRUEControl automatic advance and broadcast of DML frequencies
_dml_frequency_tracking_slot_time15Time length of each slot for DML frequency tracking
_dml_frequency_tracking_slots4Number of slots to use for DML frequency tracking
_dml_monitoring_enabledTRUEenable modification monitoring
_dmm_auto_max_features500Auto Max Features
_dmm_blas_libraryControl which BLAS/LAPACK dynamic library to load
_dmm_cnt_arr_size_threshold500000Counts Array Size Threshold
_dmm_details_filter_weight1Filter details based on weight
_dmm_force_treetop_merge0Force Treetop Merge
_dmm_inc_cholesky_rows50000Incomplete Cholesky number of rows
_dmm_ipp_cutoff0Intra-Partition Parallel size cutoff
_dmm_kmean_dense_threshold500Kmean densify threshold
_dmm_max_memory_size1000000Maximum Memory Size
_dmm_memory_size64000000Memory Size
_dmm_nobin_threshold200No Binning Row Count Threshold
_dmm_pga_load_threshold3Model size less than threshold are loaded into PGA
_dmm_reduction_rate4Reduction rate in reduction tree
_dmm_sample_lower_threshold10000Minimum Sample Size
_dmm_sample_upper_threshold500000Maximum Sample Size
_dmm_ser_test0Stress testing for serialized models
_dmm_ts_lapack1Enable usage of BLAS/LAPACK for Tall Skinny SVD
_dmm_xgboost_max_memory1000000000xgboost maximum memory
_dmsqr_qr_chunk_rows10000QR maximum chunk rows
_dnfs_rdma_enablermanEnable dNFS RDMA transfers
_dnfs_rdma_max1048576Maximum size of dNFS RDMA transfer
_dnfs_rdma_min8192Minimum size of dNFS RDMA transfer
_domain_index_batch_size2000maximum number of rows from one call to domain index fetch routine
_domain_index_dml_batch_size200maximum number of rows for one call to domain index dml routines
_dp_force_length_semanticsNONEForce nls length semantics
_dra_bmr_number_threshold1000Maximum number of BMRs that can be done to a file
_dra_bmr_percent_threshold10Maximum percentage of blocks in a file that can be BMR-ed
_dra_enable_offline_dictionaryFALSEEnable the periodic creation of the offline dictionary for DRA
_drm_parallel_freezeTRUEif TRUE enables parallel drm freeze
_drop_flashback_logical_operations_enqFALSEDrop logical operations enqueue immediately during flashback marker generation
_drop_stat_segment0drop ilm statistics segment
_drop_table_granule256drop_table_granule
_drop_table_optimization_enabledTRUEreduce SGA memory use during drop of a partitioned table
_drop_tablespace_objects0GDR: drop all tablespace objects
_ds_enable_auto_txnFALSEDynamic Sampling Service Autonomous Transaction control parameter
_ds_enable_view_samplingTRUEUse sampling for views in Dynamic Sampling
_ds_iocount_iosize6553664Dynamic Sampling Service defaults: #IOs and IO Size
_ds_parse_model2Dynamic Sampling Service Parse Model control parameter
_ds_progressive_initial_samples2Number of initial samples used for progressive sampling
_ds_progressive_no_matches_min_sample_size50Minimum sample size at which progressive sampling report no match
_ds_sampling_methodPROGRESSIVEDynamic sampling method used
_ds_xt_split_count1Dynamic Sampling Service: split count for external tables
_dsc_feature_level0controls the feature level for deferred segment creation
_dskm_health_check_cnt20DiSKMon health check counter
_dskm_single_instanceFALSEDSKM and Diskmon operating in Single Instance mode
_dss_cache_flushFALSEenable full cache flush for parallel execution
_dss_cache_flush_threshold1threshold when thread ckpt considered over obj ckpt
_dtree_area_size131072size of Decision Tree Classification work area
_dtree_binning_enabledTRUEDecision Tree Binning Enabled
_dtree_max_surrogates1maximum number of surrogates
_dtree_pruning_enabledTRUEDecision Tree Pruning Enabled
_dummy_instanceFALSEdummy instance started by RMAN
_dump_10261_level0Dump level for event 10261, 1=>minimal dump 2=>top pga dump
_dump_common_subexpressionsFALSEdump common subexpressions
_dump_connect_by_loop_dataFALSEdump connect by loop error message into trc file
_dump_cursor_heap_sizesFALSEdump comp/exec heap sizes to tryace file
_dump_interval_limit120trace dump time interval limit (in seconds)
_dump_max_limit5max number of dump within dump interval
_dump_qbc_tree0dump top level query parse tree to trace
_dump_rcvr_ipcTRUEif TRUE enables IPC dump at instance eviction time
_dump_scn_increment_stackDumps scn increment stack per session
_dump_system_state_scopelocalscope of sysstate dump during instance termination
_dump_trace_scopeglobalscope of trace dump during a process crash
_duplicated_table_complete_refresh_percent50percent threshold for duplicated table to do complete refresh
_dupt_noupdate0disable duplicated table updates
_dynamic_hash_bucket_arrayTRUEdynamic hash bucket array
_dynamic_processes_force_timeout6dynamic process force timeout
_dynamic_processes_max_oom_timeout300dynamic process max timeout for out of memory
_dynamic_processes_wait_timeout100dynamic process wait timeout for new process
_dynamic_rls_policiesTRUErls policies are dynamic
_dynamic_sequence_cacheTRUEEnable/disable sequence dynamic cache sizing
_dynamic_sequence_cache_max1000000Sequence dynamic cache maximum size
_dynamic_sequence_cache_scale10Max scale factor for dynamic sequence cache size
_dynamic_sessions_force_timeout30dynamic session force timeout
_dynamic_sessions_inc_count1000dynamic session increment count
_dynamic_sessions_max_oom_timeout300dynamic session max timeout for out of memory
_dynamic_sessions_min_force_timeout5dynamic min session force timeout
_dynamic_sessions_wait_timeout100dynamic session wait timeout for new session
_dynamic_share_range_factor2dynamic share range factor
_dynamic_stats_threshold30delay threshold (in seconds) between sending statistics messages
_early_flush_delta0SCN delta to trigger early log flush
_edition_enable_oracle_usersEdition enable Oracle supplied users
_eighteenth_spare_parametereighteenth spare parameter - integer
_eighteenth_spare_pdb_parametereighteenth spare pdb parameter - integer
_eighth_spare_pdb_parametereighth spare pdb parameter - integer
_eightieth_spare_parametereightieth spare parameter - integer
_eighty-eighth_spare_parametereighty-eighth spare parameter - string
_eighty-fifth_spare_parametereighty-fifth spare parameter - string
_eighty-ninth_spare_parametereighty-ninth spare parameter - string
_eighty-seventh_spare_parametereighty-seventh spare parameter - string
_eighty-sixth_spare_parametereighty-sixth spare parameter - string
_eighty-third_spare_parametereighty-third spare parameter - string
_eleventh_spare_parametereleventh spare parameter - integer
_eleventh_spare_pdb_parametereleventh spare pdb parameter - integer
_eliminate_common_subexprTRUEenables elimination of common sub-expressions
_emon_max_active_connections256maximum open connections to clients per emon
_emon_outbound_connect_timeout7200000timeout for completing connection set up to clients
_emon_pool_inc4increment in EMON slaves per pool type
_emon_pool_max16maximum number of EMON slaves per pool type
_emon_pool_min4minimum number of EMON slaves per pool type
_emon_regular_ntfn_slaves4number of EMON slaves doing regular database notifications
_emon_send_timeout7200000send timeout after which the client is unregistered
_emx_control0EM Express control (internal use only)
_emx_max_sessions128Maximum number of sessions in the EM Express cache
_emx_session_timeout3600Session timeout (sec) in the EM Express cache
_ena_storage_lmtDEFAULTEnable storage clause for LMT
_enable_12g_bftTRUEenable 12g bigfile tablespace
_enable_Front_End_View_Optimization1enable front end view optimization
_enable_NUMA_interleaveTRUEEnable NUMA interleave mode
_enable_NUMA_optimizationFALSEEnable NUMA specific optimizations
_enable_NUMA_supportFALSEEnable NUMA support and optimizations
_enable_asyncvioFALSEenable asynch vectored I/O
_enable_automatic_maintenance1if 1, Automated Maintenance Is Enabled
_enable_automatic_sqltuneTRUEAutomatic SQL Tuning Advisory enabled parameter
_enable_block_level_transaction_recoveryTRUEenable block level recovery
_enable_buffer_header_historyTRUEif TRUE, records operation history in buffer headers
_enable_bug_298383740enable/disable bug fix 29838374
_enable_cdb_all_syncFALSEIs CDB-wide ALL sync enabled
_enable_cdb_upgrade_captureFALSEEnable capture of CDB upgrade
_enable_check_truncateTRUEenable checking of corruption caused by canceled truncate
_enable_columnar_cache1Enable Columnar Flash Cache Rewrite
_enable_containers_subqueryTRUEenable transformation to containers() sub query
_enable_cscn_cachingFALSEenable commit SCN caching for all transactions
_enable_dbwr_auto_tracing0enable dbwriter auto-tracing
_enable_dbwr_parallel_invalidationsTRUEif TRUE, enables flush and invalidate by DBWRs
_enable_ddl_wait_lockTRUEuse this to turn off ddls with wait semantics
_enable_default_affinity0enable default implementation of hard affinity osds
_enable_default_temp_thresholdTRUEEnable Default Tablespace Utilization Threshold for UNDO Tablespaces
_enable_default_undo_thresholdTRUEEnable Default Tablespace Utilization Threshold for TEMPORARY Tablespaces
_enable_dml_lock_escalationTRUEenable dml lock escalation against partitioned tables if TRUE
_enable_drop_cloneFALSEIs drop of a Root Clone allowed
_enable_dynamic_processesFALSEdynamic process SOs
_enable_dynamic_sessionsFALSEdynamic session SOs
_enable_editions_for_usersFALSEenable editions for all users
_enable_event_portsTRUEEnable/Disable event ports
_enable_exchange_validation_using_checkTRUEuse check constraints on the table for validation
_enable_fast_file_zeroTRUEenable fast file zero code path
_enable_fast_ref_after_mv_tbsFALSEenable fast refresh after move tablespace
_enable_ffwTRUEFAL FORWARDING
_enable_flash_loggingTRUEEnable Exadata Smart Flash Logging
_enable_fsdirect_odmlibTRUEenable or disable FsDirect static ODM library
_enable_fsdirect_pinTRUEenable direct pin of FsDirect blocks
_enable_fsdirect_racFALSEenable FsDirect in RAC
_enable_gsm_listener_networksTRUEgsm listener in listener networks
_enable_guid_endpoint_serviceTRUEEnable service functionality for GUID service
_enable_hash_overflowFALSETRUE - enable hash cluster overflow based on SIZE
_enable_heatmap_internalFALSEheatmap related - to be used by oracle dev only
_enable_http_digest_generationTRUEgeneration of the HTTP Digest verifier is enabled
_enable_hwm_syncTRUEenable HWM synchronization
_enable_iee_statsTRUEenables IEE stats gathering
_enable_ignorable_error_captureFALSECapture statement if error is ignorable
_enable_ilm_flush_statsTRUEEnable ILM Stats Flush
_enable_ilm_testflush_statsFALSEEnable Test ILM Stats Flush
_enable_increase_lms_processTRUEset to true to allow _increase_lms_process changes
_enable_ios_spmFALSEAllow Split Mirror operations via IOServer
_enable_kernel_io_outliersFALSEenable kernel I/O outlier feature
_enable_kqf_purgeTRUEEnable KQF fixed runtime table purge
_enable_list_ioFALSEEnable List I/O
_enable_load_from_cloneTRUEIs load from a Root Clone allowed
_enable_log_memory_protection_keyFALSEenable memory protection keys (log)
_enable_memory_protection_keysFALSEEnable memory protection keys usage
_enable_metrics_allpdbTRUEEnable/Disable Metrics for Root and all PDBs if applicable
_enable_metrics_pdbFALSEEnable/Disable Metrics for this Non-Root PDB
_enable_midtier_affinityTRUEenable midtier affinity metrics processing
_enable_minscn_crTRUEenable/disable minscn optimization for CR
_enable_mleTRUEenable MLE
_enable_module_matchTRUEIs match of module name enforced
_enable_multiple_fgpreparesFALSEAllow concurrent PREPAREs on the same database
_enable_nativenet_tcpipFALSEEnable skgxp driver usage for native net
_enable_nvm_dispatcher0Enable NVM Dispatcher and/or DMPROC
_enable_obj_queuesTRUEenable object queues
_enable_offloaded_writesFALSEEnable offloaded writes for Unit Test
_enable_online_index_without_s_lockingTRUEAllow online index creation algorithm without S DML lock
_enable_os_cpu_rmFALSEenable internal OSCPURM testing
_enable_parallel_dmlFALSEenables or disables parallel dml
_enable_partial_syncFALSEIs partial sync of a Federation allowed
_enable_pdb_close_abortTRUEEnable PDB shutdown abort (close abort)
_enable_pdb_close_noarchivelogFALSEEnable PDB close abort with no archive logging
_enable_pdb_isolationFALSEEnables Pluggable Database isolation inside a CDB
_enable_pdb_process_limitTRUEEnable process limit as the number of sessions in the PDB.
_enable_pdb_skiplist_recoveryTRUEEnable pdb skip list setup during media recovery.
_enable_pdb_skiplist_redogenTRUEEnable pdb skip list setup during redo generation.
_enable_per_container_aclFALSEEnable Per Container ACL
_enable_perpdb_suplogFALSEper pdb supplemental logging
_enable_plcmnt_pol_usageFALSEenable placement policy usage
_enable_pluggable_databaseTRUEEnable Pluggable Database
_enable_pmem_direct_cacheTRUEif TRUE, enable PMEM direct mapped buffers
_enable_pmem_exchangeTRUEif TRUE, enable PMEM exchange during promotion
_enable_pmem_prefetchFALSEif TRUE, enable prefecting from PMEM
_enable_pmo_outside_begin_endTRUEEnable PMO outside begin-end block
_enable_proxy_distr_txnTRUEEnable Distributed Transaction in Proxy PDB
_enable_ptime_update_for_sysFALSEEnable/Disable update of user$ for sys
_enable_query_rewrite_on_remote_objsTRUEmv rewrite on remote table/view
_enable_redo_global_postFALSELGWR post globally on write
_enable_refresh_scheduleTRUEenable or disable MV refresh scheduling (revert to 9.2 behavior)
_enable_rejection_cacheTRUEEnable ASSM rejection cache
_enable_reliable_latch_waitsTRUEEnable reliable latch waits
_enable_rename_userFALSEenable RENAME-clause using ALTER USER statement
_enable_replay_upgrade_diagTRUEEnable diagnostics for Replay Upgrade
_enable_rlbTRUEenable RLB metrics processing
_enable_row_shippingTRUEuse the row shipping optimization for wide table selects
_enable_schema_synonymsFALSEenable DDL operations (e.g. creation) involving schema synonyms
_enable_scn_wait_interfaceTRUEuse this to turn off scn wait interface in kta
_enable_secure_sub_roleFALSEDisallow enabling of secure sub roles
_enable_securefile_flashback_optFALSEEnable securefile flashback optimization
_enable_sensitive_traceFALSEenable traces to contain sensitive information
_enable_separable_transactionsFALSEenable/disable separable transactions
_enable_shared_pool_durationsTRUEtemporary to disable/enable kgh policy
_enable_shared_server_sizingTRUEEnable sizing manager for shared servers
_enable_shared_server_sizing_slopeFALSEEnable utility slope in sizing manager for shared servers
_enable_shared_server_vector_ioFALSEEnable shared server vector I/O
_enable_single_dgprepareFALSEDisable concurrent PREPAREs in same disk group
_enable_space_preallocation3enable space pre-allocation
_enable_spacebgTRUEenable space management background task
_enable_sysaux_gdrFALSEGDR: Enable on SYSAUX
_enable_system_app2Enable System app for CDB-wide common users
_enable_tablespace_alertsTRUEenable tablespace alerts
_enable_tcpinfo_statistics238Enable TCP Info Statistics
_enable_tenant_id_checkFALSEEnable Tenant Id check for database link
_enable_tenant_id_transferFALSEEnable Tenant Id transfer
_enable_thr_killTRUEEnable/Disable thread directed signalling
_enable_type_dep_selectivityTRUEenable type dependent selectivity estimates
_enable_unified_memoryFALSEEnable use of unified PGA pool
_enable_verbose_gdrFALSEGDR: Enable verbose
_enable_view_pdbTRUEEnable Proxy PDB support
_endprot_chunk_commentchk 10235 dfltchunk comment for selective overrun protection
_endprot_heap_commenthp 10235 dfltheap comment for selective overrun protection
_endprot_stack_segmentsFALSEoverrun protection for kgh stack segments
_endprot_subheapsTRUEselective overrun protection for subeheaps
_enforce_minimum_password_rollover_timeTRUEEnforce minimum PASSWORD_ROLLOVER_TIME of one hour
_enqueue_deadlock_detect_all_global_locksFALSEenable deadlock detection on all global enqueues
_enqueue_deadlock_scan_secs0deadlock scan interval
_enqueue_deadlock_time_sec5requests with timeout <= this will not have deadlock detection
_enqueue_debug_multi_instanceFALSEdebug enqueue multi instance
_enqueue_hash1043enqueue hash table length
_enqueue_hash_chain_latches4enqueue hash chain latches
_enqueue_locks6060locks for managed enqueues
_enqueue_paranoia_mode_enabledFALSEenable enqueue layer advanced debugging checks
_enqueue_resources2436resources for enqueues
_enqueue_scan_interval0enqueue scan interval
_enqueue_sync_retry_attempts15max number of times the bg process to retry synchronous enqueue open if it failed because master could not allocate memory
_enqueue_sync_sim_mem_errorFALSEsimulate master instance running out of memory when synchronously getting a remotely mastered enqueue
_enqueue_wall_clock_timeFALSEif TRUE, use KSUFTIME timer
_error_row_predicate_evaluationAUTOskip predicate evaluation for error rows
_event_port_optsOptions for event ports
_evt_system_event_propagationTRUEdisable system event propagation
_exa_pmemlog_threshold_usec100maximum i/o time (usecs) for enabled Exadata PMEMLog
_exadata_feature_onFALSEExadata Feature On
_exclude_seed_cdb_viewTRUEexclude PDB$SEED from CDB View Result
_expand_aggregatesTRUEexpand aggregates
_explain_rewrite_modeFALSEallow additional messages to be generated during explain rewrite
_expression_tracking_elem_per_bucket30Number of expression usage statistics elements per hash bucket
_expression_tracking_latch_count16Number of latches for tracking expression usage statistics
_extended_pruning_enabledTRUEdo runtime pruning in iterator if set to TRUE
_external_scn_activity_trackingTRUEenable/disable external scn activity tracking
_external_scn_logging_threshold_seconds86400High delta SCN threshold in seconds
_external_scn_rejection_delta_threshold_minutes0external SCN rejection delta threshold in minutes
_external_scn_rejection_threshold_hours24Lag in hours between max allowed SCN and an external SCN
_external_table_hive_partition_restrictedTRUErestrict external tabel hive partition methods to Hive supported
_external_table_smart_scanHADOOP_ONLYExternal Table Smart Scan
_extra_lmn_enabledTRUEsuppl logging for extra record enabled
_failover_svrcsumFALSEenable server checksum to optimize failover
_fair_remote_cvtFALSEif TRUE enables fair remote convert
_fairness_threshold2number of times to CR serve before downgrading lock
_fast_cr_cloneTRUEenable fast cr clone feature
_fast_cursor_reexecuteFALSEuse more memory in order to get faster execution
_fast_dual_enabledTRUEenable/disable fast dual
_fast_full_scan_enabledTRUEenable/disable index fast full scan
_fast_index_maintenanceTRUEfast global index maintenance during PMOPs
_fast_psby_conversionTRUEEnable fast physical standby conversion
_fastpin_enable1enable reference count based fast pins
_fatalprocess_redo_dump_time_limit0time limit, in secs, for diagnostic redo dumps by a fatal process
_fb_log_max_rereads100Maximum number of rereads after reading a corrupt flashback block
_fb_recovery_slave_count0Number of recovery slaves to be used by the FLASHBACK DATABASE
_fbda_adv_gbl_bscn_bcast_interval0flashback archiver broadcast interval to advance global barrier SCN
_fbda_busy_percentage0flashback archiver busy percentage
_fbda_debug_assert0flashback archiver debug assert for testing
_fbda_debug_mode0flashback archiver debug event for testing
_fbda_global_bscn_lag0flashback archiver global barrier scn lag
_fbda_inline_percentage0flashback archiver inline percentage
_fbda_rac_inactive_limit0flashback archiver rac inactive limit
_fbda_tcrv_cleanup_lag3600flashback archiver tcrv cleanup lag in secs
_federation_max_root_clones4000Maximum number of Root Clones per Root
_federation_scriptFALSERunning a Federation script
_ffs_in_range_scan_threshold50threshold of min percentage of block read to use ffs in rs
_fg_fast_sync_slack_usecs1DAX log file sync sleep slack time
_fg_fast_sync_sleep_target_pct50DAX log file sync sleep target pct
_fg_fast_sync_sleep_usecs0DAX log file sync sleep time
_fg_fast_sync_spin_usecs100DAX log file sync spin time
_fg_iorm_slaves1ForeGround I/O slaves for IORM
_fg_log_checksumTRUEChecksum redo in foreground process
_fg_sync_sleep_usecs0Log file sync via usleep
_fic_algorithm_setautomaticSet Frequent Itemset Counting Algorithm
_fic_area_size131072size of Frequent Itemset Counting work area
_fic_min_bmsize1024Frequent Itemset Counting Minimum BITMAP Size
_fifteenth_spare_parameterfifteenth spare parameter - integer
_fifteenth_spare_pdb_parameterfifteenth spare pdb parameter - integer
_fifth_spare_parameterfifth spare parameter - integer
_fifth_spare_pdb_parameterfifth spare pdb parameter - integer
_fiftieth_spare_parameterfiftieth spare parameter - integer
_fiftieth_spare_pdb_parameterfiftieth spare pdb parameter - string list
_fifty-eighth_spare_parameterfifty-eighth spare parameter - integer
_fifty-eighth_spare_pdb_parameterfifty-eighth spare pdb parameter - boolean
_fifty-fifth_spare_parameterfifty-fifth spare parameter - integer
_fifty-fifth_spare_pdb_parameterfifty-fifth spare pdb parameter - boolean
_fifty-first_spare_parameterfifty-first spare parameter - integer
_fifty-fourth_spare_parameterfifty-fourth spare parameter - integer
_fifty-fourth_spare_pdb_parameterfifty-fourth spare pdb parameter - boolean
_fifty-ninth_spare_parameterfifty-ninth spare parameter - integer
_fifty-ninth_spare_pdb_parameterfifty-ninth spare pdb parameter - boolean
_fifty-second_spare_parameterfifty-second spare parameter - integer
_fifty-seventh_spare_parameterfifty-seventh spare parameter - integer
_fifty-seventh_spare_pdb_parameterfifty-seventh spare pdb parameter - boolean
_fifty-sixth_spare_parameterfifty-sixth spare parameter - integer
_fifty-sixth_spare_pdb_parameterfifty-sixth spare pdb parameter - boolean
_fifty-third_spare_parameterfifty-third spare parameter - integer
_fifty-third_spare_pdb_parameterfifty-third spare pdb parameter - boolean
_file_offline_sync_timeout900Timeout to sync file offline enqueue (secs)
_file_set_enqueue_timeout1200Timeout to acquire file set enqueue (secs)
_file_size_increase_increment67108864Amount of file size increase increment, in bytes
_filemap_dirFILEMAP directory
_first_k_rows_dynamic_prorationTRUEenable the use of dynamic proration of join cardinalities
_first_spare_pdb_parameterfirst spare pdb parameter - integer
_fix_controlbug fix control parameter
_fix_fuzzy_scnFALSEfix fuzzy SCN
_fixup_all_appsFALSECallback to fix up replay state of all applications
_fixup_app_pdb_status_in_rootapplication name whose PDB application status should be fixed up
_fixup_cdb_appsFALSECallback to fix up replay state of CDB-wide applications
_flashback_11_1_block_new_optFALSEuse 11.1 flashback block new optimization scheme
_flashback_allow_noarchivelogFALSEAllow enabling flashback on noarchivelog database
_flashback_archiver_partition_size0flashback archiver table partition size
_flashback_barrier_interval1800Flashback barrier interval in seconds
_flashback_copy_latches10Number of flashback copy latches
_flashback_database_test_onlyFALSERun Flashback Database in test mode
_flashback_delete_chunk_MB128Amount of flashback log (in MB) to delete in one attempt
_flashback_dynamic_enableTRUEenable flashback enable code path
_flashback_dynamic_enable_failure0Simulate failures during dynamic enable
_flashback_enable_raTRUEFlashback enable read ahead
_flashback_format_chunk_mb4Chunk mega-bytes for formatting flashback logs using sync write
_flashback_format_chunk_mb_dwrite16Chunk mega-bytes for formatting flashback logs using delayed write
_flashback_fuzzy_barrierTRUEUse flashback fuzzy barrier
_flashback_generation_buffer_size16777216flashback generation buffer size
_flashback_hint_barrier_percent20Flashback hint barrier percent
_flashback_log_io_error_behavior0Specify Flashback log I/O error behavior
_flashback_log_min_size100Minimum flashback log size
_flashback_log_rac_balance_factor10flashback log rac balance factor
_flashback_log_size1000Flashback log size
_flashback_logfile_enqueue_timeout600flashback logfile enqueue timeout for opens
_flashback_marker_cache_enabledTRUEEnable flashback database marker cache
_flashback_marker_cache_size328Size of flashback database marker cache
_flashback_marker_for_every_grpFALSEgenerate a new flashback marker for every GRP
_flashback_max_log_size0Maximum flashback log size in bytes (OS limit)
_flashback_max_n_log_per_thread2048Maximum number of flashback logs per flashback thread
_flashback_max_standby_sync_span300Maximum time span between standby recovery sync for flashback
_flashback_n_log_per_thread128Desired number of flashback logs per flashback thread
_flashback_prepare_logTRUEPrepare Flashback logs in the background
_flashback_reclaim_monitor_window7Proactive flashback logs reclaimation window
_flashback_reclaim_speed_upFALSEProactive flashback logs reclaimation speed up
_flashback_size_based_on_redoTRUESize new flashback logs based on average redo log size
_flashback_standby_barrier_interval1Flashback standby barrier interval in seconds
_flashback_standby_check_barrier_MIRA20Flashback standby check barrier generation in seconds
_flashback_standby_check_minpfh_MIRA15Flashback standby check minimum high fuzzy scn in seconds
_flashback_stby_support_miraTRUEFlashback database on standby supports MIRA
_flashback_validate_controlfileFALSEvalidate flashback pointers in controlfile for 11.2.0.2 database
_flashback_verbose_infoFALSEPrint verbose information about flashback database
_flashback_write_max_loop_limit10Flashback writer loop limit before it returns
_flush_ilm_stats0flush ilm stats
_flush_log_buffer_forceFALSEFlush log buffer force
_flush_log_buffer_timeout0Flush log buffer wait time in seconds
_flush_plan_in_awr_sql0Plan is being flushed from an AWR flush SQL
_flush_redo_to_standby0Flush redo to standby test parameter
_flush_undo_after_tx_recoveryTRUEif TRUE, flush undo buffers after TX recovery
_fob_dgaallocTRUEFob structure allocation from Domain Global Area memory
_fob_ospshareTRUEFob structure and file descriptor sharing between threads with-in an OSP in MPMT environment
_force_arch_compress0Archive Compress all newly created compressed tables
_force_cloud_onFALSEsimulate EHCC code path enable in Cloud Database
_force_containers_subqueryFALSEforce transformation to containers() sub query
_force_datefold_truncFALSEforce use of trunc for datefolding rewrite
_force_dax_io_err0Force I/O error on online/standby redo log
_force_hash_join_spillFALSEforce hash join to spill to disk
_force_hsc_compressFALSEcompress all newly created tables
_force_java_pool_zeroFALSEforce java pool size to be zero bytes
_force_local_tempFALSEFor testing only Forces temporary tablespaces to be LOCAL
_force_logging_in_upgradeTRUEforce logging during upgrade mode
_force_oltp_compressFALSEOLTP Compress all newly created compressed tables
_force_oltp_update_optTRUEOLTP Compressed row optimization on update
_force_partial_compressFALSEForce using OLTP Partial Compression
_force_pmem_direct_mapped_cache_scanTRUEif TRUE, force PMEM mapped direct path scan to cache path scan
_force_rewrite_enableFALSEcontrol new query rewrite features
_force_slave_mapping_intra_part_loadsFALSEForce slave mapping for intra partition loads
_force_standard_compileFALSEforce compilation of STANDARD
_force_sys_compressTRUESys compress
_force_temp_space_cleanupTRUEForce temp space cleanup after PDB close
_force_temptables_for_gsetsFALSEexecutes concatenation of rollups using temp tables
_force_tmp_segment_loadsFALSEForce tmp segment loads
_forced_endian_typeUNKNOWNForced endian type of data dictionary
_fortieth_spare_parameterfortieth spare parameter - integer
_fortieth_spare_pdb_parameterfortieth spare pdb parameter - string
_forty-eighth_spare_parameterforty-eighth spare parameter - integer
_forty-eighth_spare_pdb_parameterforty-eighth spare pdb parameter - string list
_forty-fifth_spare_parameterforty-fifth spare parameter - integer
_forty-fifth_spare_pdb_parameterforty-fifth spare pdb parameter - string list
_forty-first_spare_parameterforty-first spare parameter - integer
_forty-first_spare_pdb_parameterforty-first spare pdb parameter - string list
_forty-fourth_spare_parameterforty-fourth spare parameter - integer
_forty-fourth_spare_pdb_parameterforty-fourth spare pdb parameter - string list
_forty-ninth_spare_parameterforty-ninth spare parameter - integer
_forty-ninth_spare_pdb_parameterforty-ninth spare pdb parameter - string list
_forty-second_spare_parameterforty-second spare parameter - integer
_forty-second_spare_pdb_parameterforty-second spare pdb parameter - string list
_forty-seventh_spare_parameterforty-seventh spare parameter - integer
_forty-seventh_spare_pdb_parameterforty-seventh spare pdb parameter - string list
_forty-sixth_spare_parameterforty-sixth spare parameter - integer
_forty-sixth_spare_pdb_parameterforty-sixth spare pdb parameter - string list
_forty-third_spare_parameterforty-third spare parameter - integer
_forty-third_spare_pdb_parameterforty-third spare pdb parameter - string list
_forwarded_2pc_threshold10auto-tune threshold for two-phase commit rate across RAC instances
_fourteenth_spare_pdb_parameterfourteenth spare pdb parameter - integer
_fourth_spare_pdb_parameterfourth spare pdb parameter - integer
_frame_cache_time0number of seconds a cached frame page stay in cache.
_freeze_kgh_timestampFALSEprevent heap manager timestamp from advancing
_fsdirect_fast_file_createTRUEAllow optimized file creation path for FsDirects
_full_diag_on_rimFALSErim nodes have full DIA* function
_full_pwise_join_enabledTRUEenable full partition-wise join when TRUE
_fusion_securityTRUEFusion Security
_gas_partition_size0Global Address Space Partition Size for each instance
_gby_hash_aggregation_enabledTRUEenable group-by and aggregation using hash scheme
_gby_onekey_enabledTRUEenable use of one comparison of all group by keys
_gby_vector_aggregation_enabledTRUEenable group-by and aggregation using vector scheme
_gc_affinity_lockingTRUEif TRUE, enable object affinity
_gc_affinity_locksTRUEif TRUE, get affinity locks
_gc_affinity_ratio50dynamic object affinity ratio
_gc_anti_lock_ratio66dynamic object anti-lock ratio
_gc_async_sendTRUEif TRUE, send blocks asynchronously
_gc_bg_mergeTRUEif TRUE, merge pi buffers in the background
_gc_blocking_pinsFALSEif TRUE, record a histogram of blocking pins
_gc_buckets_per_latch0number of hash buckets per latch
_gc_bypass_readersTRUEif TRUE, modifications bypass readers
_gc_check_bscnTRUEif TRUE, check for stale blocks
_gc_coalesce_recovery_readsTRUEif TRUE, coalesce recovery reads
_gc_cr_server_read_waitTRUEif TRUE, cr server waits for a read to complete
_gc_defer_ping_index_onlyTRUEif TRUE, restrict deferred ping to index blocks only
_gc_defer_time0how long to defer pings for hot buffers in microseconds
_gc_delay_pingTRUEif TRUE, delay pings to hot blocks
_gc_disable_cell_populateFALSEif TRUE, disable cell ram cache populate
_gc_disable_s_lock_brr_ping_checkTRUEif TRUE, disable S lock BRR ping check for lost write protect
_gc_down_convert_after_keepTRUEif TRUE, down-convert lock after recovery
_gc_down_convert_after_writeTRUEif TRUE, down-convert lock after a write
_gc_drm_windows8number of DRM windows
_gc_dump_remote_lockTRUEif TRUE, dump remote lock
_gc_element_percent105global cache element percent
_gc_enable_cr_bypassTRUEif TRUE, enable CR bypass mechanism
_gc_fast_index_split_timeout100fast index split wait timeout
_gc_fast_index_split_wait0fast index split wait usn array size
_gc_fg_mergeTRUEif TRUE, merge pi buffers in the foreground
_gc_fg_spin_time0foreground msgq spin time
_gc_first_dirty_mergeTRUEif TRUE, merge with a pi after first dirty
_gc_flush_during_affinityTRUEif TRUE, flush during affinity
_gc_fusion_compression1024compress fusion blocks if there is free space
_gc_global_checkpoint_scnTRUEif TRUE, enable global checkpoint scn
_gc_global_lruAUTOturn global lru off, make it automatic, or turn it on
_gc_global_lru_touch_count5global lru touch count
_gc_global_lru_touch_time60global lru touch time in seconds
_gc_integrity_checks1set the integrity check level
_gc_interconnect_checksumFALSEif TRUE, checksum interconnect blocks
_gc_keep_recovery_buffersTRUEif TRUE, make recovery buffers current
_gc_keep_undo_recovery_buffersTRUEif TRUE, make recovery undo buffers current
_gc_latches32number of latches per LMS process
_gc_lease_time10000lease time for memoptimize reads
_gc_log_flushTRUEif TRUE, flush redo log before a current block transfer
_gc_max_downcvt4096maximum downconverts to process at one time
_gc_max_reg_sz68719476736maximum length for memory registration
_gc_msgq_buffers0set number of MSGQ buffers
_gc_no_fairness_for_clonesTRUEif TRUE, no fairness if we serve a clone
_gc_numa_lock_elementsFALSEif TRUE, numa aware lock element distribution
_gc_object_queue_max_length0maximum length for an object queue
_gc_override_force_crTRUEif TRUE, try to override force-cr requests
_gc_partial_cleanoutTRUEif TRUE, partial cleanout is enabled
_gc_persistent_read_mostlyTRUEif TRUE, enable persistent read-mostly locking
_gc_policy_minimum1500dynamic object policy minimum activity per minute
_gc_policy_rm_dirty_percent1percent of cache which can be dirty for readmostly
_gc_policy_time20how often to make object policy decisions in minutes
_gc_rdma_connections8000maximum number of buffer cache RDMA connections
_gc_read_mostly_flush_checkFALSEif TRUE, optimize flushes for read mostly objects
_gc_read_mostly_lockingTRUEif TRUE, enable read-mostly locking
_gc_sanity_check_cr_buffersFALSEif TRUE, sanity check CR buffers
_gc_save_cleanoutFALSEif TRUE, save cleanout to apply later
_gc_serve_from_flash_cacheFALSEif TRUE, try to serve a flash cache buffer
_gc_skip_undo_disk_readTRUEif TRUE, skip the disk read for undo blocks
_gc_spin_time32rdma spin time
_gc_statisticsTRUEglobal cache statistics level
_gc_temp_affinityFALSEif TRUE, enable global temporary affinity
_gc_trace_blocking_pinsFALSEif TRUE, trace blocking pins
_gc_trace_freelist_emptyFALSEif TRUE, dump a trace when we run out of lock elements
_gc_transfer_ratio75dynamic object read-mostly transfer ratio
_gc_try_to_skip_imc_flushTRUEif TRUE, try to skip an imc populate flush
_gc_undo_affinityTRUEif TRUE, enable undo affinity
_gc_undo_block_disk_readsTRUEif TRUE, enable undo block disk reads
_gc_undo_header_rdma_readTRUEif TRUE, rdma read of undo headers is enabled
_gc_undo_rdma_readFALSEif TRUE, rdma read of undo blocks is enabled
_gc_vector_readTRUEif TRUE, vector read current buffers
_gc_xmem_rdmaFALSEif TRUE, xmem blocks rdma read is enabled
_gcr_cpu_consumer_dump_level0level of process dump performed for CPU consumers
_gcr_cpu_min_free10minimum amount of free CPU to flag an anomaly
_gcr_cpu_min_hard_limit0hard limit for min free CPU to flag high CPU
_gcr_css_group_largesize of large CSS group above which query/update disabled
_gcr_css_group_query_boostallowed number of serial multiple queries
_gcr_css_group_try_lock_delayminimum delay between group locking attempts, secs
_gcr_css_group_update2_intervalinterval between CSS group updates when busy, secs
_gcr_css_group_update_intervalinterval between CSS group updates, secs
_gcr_css_use_2group_lockTRUEif FALSE, GCR will not try to lock 2 CSS groups at the same time
_gcr_disabled_actionsgcr disabled actions list
_gcr_disabled_metricsgcr disabled metrics list
_gcr_dump_cpu_consumersFALSEif TRUE, enable dumps of CPU consumers
_gcr_enable_async_slavesTRUEif TRUE, GCR will spawn slave actions asynchronously
_gcr_enable_high_cpu_killFALSEif TRUE, GCR may kill foregrounds under high load
_gcr_enable_high_cpu_rmTRUEif TRUE, GCR may enable a RM plan under high load
_gcr_enable_high_cpu_rtTRUEif TRUE, GCR may boost bg priority under high load
_gcr_enable_high_memory_killFALSEif TRUE, GCR may kill foregrounds under high memory load
_gcr_enable_kill_inst_diagsFALSEif TRUE, GCR will collect OS diags prior to kill instance
_gcr_enable_ktfbue_gather_statsTRUEenable/disable gather stats on X$KTFBUE
_gcr_enable_new_drm_checkTRUEif FALSE, revert to old drm load metric
_gcr_enable_pdb_abortFALSEif TRUE, GCR will process pdb abort messages
_gcr_enable_statistical_cpu_checkTRUEif FALSE, revert to old cpu load metric
_gcr_ges_cachedres_mult20ges cached resources multiplier
_gcr_ges_longchain_mult5ges longchain multiplier
_gcr_high_cpu_threshold10minimum amount of CPU process must consume to be kill target
_gcr_high_cpwt_threshold30longest tolerable ctwr process waits time
_gcr_high_fbwt_threshold300longest tolerable free buffer waits time
_gcr_high_hashlist_latch_nowait_misses10000highest hash list get nowait fails tolerable
_gcr_high_hashlist_latch_wait_misses10000highest hash list get wait fails tolerable
_gcr_high_lfsci_threshold1800longest tolerable log file switch (checkpoint incomplete) wait
_gcr_high_memory_threshold10minimum amount of Memory process must consume to be kill target
_gcr_max_rt_procsmaximum number of RT DLM processes allowed by GCR
_gcr_mem_min_free10minimum amount of free memory to flag an anomaly
_gcr_min_free_memory_hard_limit1073741824hard limit for minimum free memory,for high memory systems
_gcr_tickduration of time tick used by state machine, centisecs
_gcr_use_cssTRUEif FALSE, GCR wont register with CSS nor use any CSS feature
_gcs_cluster_flash_cache_mode0cluster flash cache mode
_gcs_cluster_flash_cache_persistencyFALSEEnable cluster flash cache persistency (FALSE = disable (default), TRUE = enable
_gcs_cr_master_ping_remoteTRUEif TRUE, cr request from master will ping the remote holder
_gcs_crslave_check_time10time interval to check for load on cr slaves in seconds
_gcs_crslave_longq_cnt2000long queue time threshold for cr slave
_gcs_crslave_longq_us1000long queue time for cr slave in microseconds
_gcs_current_rdma1if greater than 0, rdma read of current blocks is enabled
_gcs_current_rdma_grant_globalTRUEif TRUE, enable rdma read of current blocks for global role
_gcs_disable_imc_preallocationFALSEdisable preallocation for imc memory requirement in RAC
_gcs_disable_remote_handlesFALSEdisable remote client/shadow handles
_gcs_disable_skip_close_remasteringFALSEif TRUE, disable skip close optimization in remastering
_gcs_dynamic_sgaFALSEif TRUE, enable dynamic cache fusion resources in runtime
_gcs_dynamic_sga_preference0gcs dynamic sga preference
_gcs_dynamic_slavesTRUEif TRUE, it enables dynamic adjustment of the number of gcs slaves
_gcs_enable_private_iteratorTRUEEnable private iterator for GCS locks
_gcs_fast_reconfigTRUEif TRUE, enable fast reconfiguration for gcs locks
_gcs_flash_cache_mode0flash cache mode
_gcs_freelists_alloc_percent0initial allocation of gcs freelists percentage of max usage
_gcs_integrity_checks1cache fusion integrity check level
_gcs_latches128number of gcs resource hash latches to be allocated per LMS process
_gcs_lsr_frequency60frequency of invoking lock state resolution in seconds
_gcs_min_cr_slaves0if non zero, it enables the minimum number of gcs slaves
_gcs_min_slaves0if non zero, it enables the minimum number of gcs slaves
_gcs_partial_open_mode1partial open cache fusion service in reconfiguration
_gcs_pkey_history16384number of pkey remastering history
_gcs_process_in_recoveryTRUEif TRUE, process gcs requests during instance recovery
_gcs_recoverable_asserts0if non-zero, enable recoverable assert resolution
_gcs_res_hash_bucketsnumber of gcs resource hash buckets to be allocated
_gcs_res_per_bucket4number of gcs resource per hash bucket
_gcs_reserved_resources400allocate the number of reserved resources in reconfiguration
_gcs_reserved_shadows400allocate the number of reserved shadows in reconfiguration
_gcs_resources0number of gcs resources to be allocated
_gcs_shadow_locks0number of gcs shadow locks to be allocated
_gcs_spin_check_instance_threshold30threshold timeout to dump proc in spin check in seconds
_gcs_spin_check_threshold4096spin check attempt count
_gcs_spin_check_time_interval300spin check time interval in seconds
_gcs_testing0GCS testing parameter
_gcs_trace_bucketFALSETRUE: use GCS trace bucket and trace LOW by default, FALSE: use default bucket but trace only if enabled
_gcs_trace_bucket_sizeLMS:1048576-RMV:1048576-CRV:1048576-DBW:524288size of the GCS trace bucket in bytes (format: "LMS:-RMV:-CRV:-DBW:")
_gcs_track_reliable_block_sendsFALSEif TRUE, track block lost on reliable interconnect
_gcs_verify_antilockFALSEif TRUE, enable anti-lock check
_gdr_clear_active_onlyFALSEGDR: Clear active ranges only
_gdr_clear_inactive_onlyFALSEGDR: Clear inactive ranges only
_gdr_control_flags0gdr control flags
_gds_allow_nullkey0allow the use of nullable shard key columns
_gds_chunk_num0number of chunks in sharding environment
_gds_lddlid0the id of the last executed DDL query
_gds_max_chunk_num0max chunk_num used in sharding environment
_gds_shardgroup_id0shardgroup database is in
_generalized_pruning_enabledTRUEcontrols extensions to partition pruning for general predicates
_ges_dd_debug1if 1 or higher enables GES deadlock detection debug diagnostics
_ges_default_lmds*default lmds for enqueue hashing
_ges_designated_masterTRUEdesignated master for GES and GCS resources
_ges_diagnosticsTRUEif TRUE enables GES diagnostics
_ges_diagnostics_asm_dump_level11systemstate level on global enqueue diagnostics blocked by ASM
_ges_direct_freeFALSEif TRUE, free each resource directly to the freelist
_ges_direct_free_res_typestring of resource types(s) to directly free to the freelist
_ges_dump_open_locksFALSEif TRUE, dump open locks for the LCK process during shutdown
_ges_fgglTRUEDLM fg grant lock on/off
_ges_freeable_res_chunk_freeTRUEif TRUE, free dynamic resource chunks which are freeable
_ges_freeable_res_chunk_free_interval180time interval for freeing freeable dynamic resource chunks
_ges_gather_res_reuse_statsFALSEif TRUE, gather resource reuse statistics
_ges_hash_groups*enqueue hash table groups
_ges_health_check0if greater than 0 enables GES system health check
_ges_lmd_mapping*enqueue to lmd mapping
_ges_mseq_demo0demo mseq wrap scenarios (dflt is 0)
_ges_nres_divide0how to divide number of enqueue resources among hash tables
_ges_num_blockers_to_kill1number of blockers to be killed for hang resolution
_ges_optimizations3GES optimizations level
_ges_resource_memory_opt4enable different level of ges res memory optimization
_ges_server_processes1number of background global enqueue server processes
_ges_vbfreelists0number of valueblock freelists (will be adjusted to power of 2)
_global_hang_analysis_interval_secs10the interval at which global hang analysis is run
_globaldict_analyzer_pct100Maximum percentage of unique values in analyzer phase for GD
_globaldict_chain_limit32Chain limit for global dictionary
_globaldict_check0Dictionary checking
_globaldict_chunk_minallocFALSEForce minimum chunk allocation size
_globaldict_dbg0Global dictionary debug modes
_globaldict_enable2Enable segment dictionary
_globaldict_max_gdsize1073741824Maximum number of entries in a Global dictionary
_globaldict_reprobe_limit1Reprobe limit for global dictionary
_globaldict_use_ndvTRUEUse NDV for sizing global dictionary, if available
_globalindex_pnum_filter_enabledTRUEenables filter for global index with partition extended syntax
_grant_read_instead_of_selectFALSEgrant read privilege instead of select wherever applicable
_grant_secure_roleFALSEDisallow granting of SR to other SR or NSR
_grant_unlimited_tablespace_roleFALSEAllow UNLIMITED TABLESPACE privilege grant to database roles
_group_membership_bucket_batch_size8ksimpoll group membership bucket batch size
_group_membership_bucket_scan_timeout5ksimpoll group membership bucket scan timeout
_group_membership_entries_per_bucket100ksimpoll group membership entries per bucket
_groupby_nopushdown_cut_ratio3groupby nopushdown cut ratio
_groupby_orderby_combine5000groupby/orderby don't combine threshold
_gs_anti_semi_join_allowedTRUEenable anti/semi join for the GS query
_gsmGSM descriptions
_gsm_config_vers0version of gsm config
_gsm_cpu_thresh75CPU busy threshold
_gsm_drv_interval30metric derived values interval
_gsm_max_instances_per_db8maximum number of instances per database in gsm cloud
_gsm_max_num_regions10maximum number of regions in gsm cloud
_gsm_pool_size134217728Global Shared Memory size
_gsm_region_listList of GSM Regions
_gsm_srlat_thresh20Single block read latency threshold
_gsm_srvctl_diag_time0gsm invoked srvctl pre-timeout diagnostic time
_gsm_srvctl_timeout0gsm invoked srvctl timeout
_gsm_svcrgnmax100Maximum Service x Region statistics
_gsm_thresh_respct50threshold resource percentage
_gsm_thresh_zone10threshold zone
_gwm_autoons_ha_subscriptionAutoONS HA notification subscription string
_gwm_autoons_rlb_subscriptionAutoONS RLB notification subscription string
_gwm_database_flagsGWM Database Flags
_gwm_db_unique_namegsm db_unique_name name
_gwm_disable_raFALSEOracle internal parameter
_gwm_int_dbnum0GWM internal db id
_gwm_lagtypegsm lag type
_gwm_spare1gsm spare 1
_gwm_spare20gsm spare 2
_gwm_spare30gsm spare 3
_gwm_sys_ddl0allow DDL as SYS
_gwm_use_srvctl0use srvctl for service mnagement
_gws_cache_version0the shard/catalog cache version.
_gws_catalog_wallet0the sharding catalog has a wallet
_gws_deployed0the shardb/catalog has been deployed for sharding.
_gws_encddl0Encrypt DDL text.
_gws_sharding_method0Sharding method used (system-managed/user-defined/composite)
_hang_allow_resolution_on_single_nonracDBRMHang Management allow resolution on single non-RAC instances
_hang_analysis_num_call_stacks3hang analysis num call stacks
_hang_analyze_elapsed_time_limit1800Hang Analyze elapsed time limit in seconds
_hang_analyze_oradebug_time_limit900timeout for oradebug invoked hang analysis
_hang_appl_issue_session_threshold0Hang Management application issue session threshold
_hang_application_hang_resolution_enabledFALSEHang Management application related hang resolution enabled
_hang_asm_hang_resolution_enabledFALSEHang Management ASM hang resolution enabled
_hang_base_file_count5Number of trace files for the normal base trace file
_hang_base_file_space_limit100000000File space limit for current normal base trace file
_hang_blocked_session_percent_threshold20Hang Manager fast-track blocked session percent threshold
_hang_bool_spare1TRUEHang Management bool 1
_hang_bool_spare2TRUEHang Management bool 2
_hang_bool_spare3TRUEHang Management bool 3
_hang_cpu_hung_thresh_sec120Hang Manager threshold for resmgr:cpu quantum
_hang_cross_boundary_hang_detection_enabledTRUEHang Management Cross Boundary detection
_hang_cross_cluster_hang_detection_enabledTRUEHang Management Cross Cluster detection
_hang_deadlock_resolution_enabledTRUEHang Management deadlock resolution enabled
_hang_delay_resolution_for_libcacheTRUEHang Management delays hang resolution for library cache
_hang_detection_enabledTRUEHang Management detection
_hang_enable_processstateTRUEEnable Process State Dumping
_hang_fast_tracked_hang_verification_interval10Hang Manager fast-track hang verification interval
_hang_ft_min_degrading_samples_percent_threshold60Hang Manager fast-track minimum degrading samples threshold
_hang_hang_analyze_output_hang_chainsTRUEif TRUE hang manager outputs hang analysis hang chains
_hang_hang_blocked_session_delta_percent_threshold20Hang Manager hang's blocked session delta percent threshold
_hang_high_session_count_update_hb_threshold2000Hang Manager high session count update heartbeat threshold
_hang_hiload_promoted_ignored_hang_count2Hang Management high load or promoted ignored hang count
_hang_hiprior_session_attribute_listHang Management high priority session attribute list
_hang_hs_hang_metrics_enabledTRUEHang Management Hang Specific hang metrics enabled
_hang_hung_session_ewarn_percent34Hang Management hung session early warning percentage
_hang_ignore_hngmtrc_interval150Hang Management ignore hang metric dependent hang interval
_hang_ignored_hang_count1Hang Management ignored hang count
_hang_ignored_hangs_interval300Time in seconds ignored hangs must persist after verification
_hang_int_spare20Hang Management int 2
_hang_int_spare30Hang Management int 3
_hang_intersecting_chains_scanning_enabledTRUEHang Management intersecting chains scanning is allowed
_hang_log_important_hangs_to_alertTRUEHang Management log important hangs to alert log
_hang_log_io_hung_sessions_to_alertFALSEHang Management log sessions hung on IO to alert log
_hang_log_verified_hangs_to_alertFALSEHang Management log verified hangs to alert log
_hang_low_wait_time_cutoff6Hang Management low wait time cutoff in seconds
_hang_lws_file_count5Number of trace files for long waiting sessions
_hang_lws_file_space_limit100000000File space limit for current long waiting session trace file
_hang_mark_some_idle_waits_terminalFALSEHang Management mark some wait events as terminal waits
_hang_max_instance_allow_node_eviction1Hang Manager maximum instance count to allow node eviction
_hang_max_local_db_clients_allowed0Hang Manager maximum local db clients allowed
_hang_max_session_hang_time96Hang Management maximum session hang time in seconds
_hang_metrics_older_bitmap_threshold25Hang Management Hang Metric older bitmap threshold
_hang_metrics_recent_bitmap_threshold50Hang Management Hang Metric recent bitmap threshold
_hang_monitor_archiving_related_hang_interval300Time in seconds ignored hangs must persist after verification
_hang_msg_checksum_enabledTRUEenable hang graph message checksum
_hang_promote_process_termination_interval70Hang Management promote process termination interval in seconds
_hang_px_resolution_on_asm_enabledTRUEHang Management px resolution on ASM enabled
_hang_resolution_allow_archiving_issue_terminationTRUEHang Management hang resolution allow archiving issue termination
_hang_resolution_confidence_promotionFALSEHang Management hang resolution confidence promotion
_hang_resolution_global_hang_confidence_promotionFALSEHang Management hang resolution global hang confidence promotion
_hang_resolution_partial_hangs_on_asm_enabledTRUEHang Management resolution of partial hangs on ASM enabled
_hang_resolution_percent_hung_sessions_threshold300Hang Manager hang resolution percent hung sessions threshold
_hang_resolution_percent_hung_sessions_threshold25000Hang Manager hang resolution percent hung sessions threshold2
_hang_resolution_policyHIGHHang Management hang resolution policy
_hang_resolution_promote_process_terminationTRUEHang Management hang resolution promote process termination
_hang_resolution_scopeINSTANCEHang Management hang resolution scope
_hang_root_ha_phase_trigger_time300Hang Management root HA phase trigger time
_hang_running_in_lrgFALSEHang Management running in lrg
_hang_sess_enq_wait_blocked_session_threshold5Hang Management session enqueue wait blocked session threshold
_hang_sess_enq_wait_resltn_trig_time0Hang Management session enqueue wait resolution trigger time
_hang_short_stacks_output_enabledTRUEif TRUE hang manager outputs short stacks
_hang_signature_list_match_output_frequency10Hang Signature List matched output frequency
_hang_singleton_detection_rw_enabledFALSEHang Management singleton detection enabled for read-write
_hang_singleton_resolution_rw_enabledFALSEHang Management singleton resolution enabled for read-write
_hang_statistics_collection_interval15Hang Management statistics collection interval in seconds
_hang_statistics_collection_ma_alpha30Hang Management statistics collection moving average alpha
_hang_statistics_high_io_percentage_threshold25Hang Management statistics high IO percentage threshold
_hang_terminate_session_replay_enabledTRUEHang Management terminates sessions allowing replay
_hang_trace_interval32Hang Management trace interval in seconds
_hang_verification_interval46Hang Management verification interval in seconds
_hard_protectionFALSEif TRUE enable H.A.R.D specific format changes
_hash_join_enabledTRUEenable/disable hash join
_hash_multiblock_io_count0number of blocks hash join will read/write at once
_hashops_prefetch_size4maximum no of rows whose relevant memory locations are prefetched
_hb_redo_interval1000generic heartbeat redo frequency
_hb_redo_msg_interval100BOC HB redo message interval in ms
_hcs_disable_all_pruneFALSEprune hierarchies pinned to ALL level
_hcs_disable_all_qry_optzFALSEskip all query optimization on generated SQL
_hcs_disable_audit_optFALSEdisable audit optimization
_hcs_disable_av_jback_optFALSEoptimize analytic view query joinback
_hcs_disable_av_sql_hintFALSEdisable analytic view sql hint
_hcs_disable_bd_agg_optFALSEoptimize base data aggregation
_hcs_disable_calc_dtm_to_out_optFALSEapply move calc determined hier to output hier optimization
_hcs_disable_calc_optFALSEcalc optimize
_hcs_disable_calc_union_optFALSEdisable determine all optimization
_hcs_disable_cell_qry_atr_prune_optFALSEapply attribute prune optimization to cell query
_hcs_disable_cell_qry_lvl_prune_optFALSEapply level prune optimization to cell query
_hcs_disable_cell_qry_mv_cache_optFALSEapply mv cache optimization to cell query
_hcs_disable_cell_qry_no_calc_nav_optFALSEapply no calc navigation optimization to cell query
_hcs_disable_cell_qry_no_out_data_optFALSEapply no output data optimization to cell query
_hcs_disable_col_prune_optzFALSEskip column pruning optimization on generated SQL
_hcs_disable_dt_opt_cell_qryFALSEdisable cell query optimizations for datatype queries
_hcs_disable_dup_nav_calc_optFALSEduplicate navigation calc optimize
_hcs_disable_dup_src_tbl_optFALSEapply duplicate src table optimization
_hcs_disable_exists_distinctFALSEno exists distinct
_hcs_disable_filter_hierarchiesFALSEfilter hierarchies in hcs queries
_hcs_disable_fltr_below_fltr_star_optFALSEapply filter below filtered star optimization
_hcs_disable_fltr_fact_optFALSEapply filtered fact optimization
_hcs_disable_fltr_hier_star_optFALSEapply filtered hierarchy star optimization
_hcs_disable_hier_join_map_nonnullFALSEno hier join map non null
_hcs_disable_inlineFALSEadd inline hint to star block
_hcs_disable_inline_tmpl_optFALSEapply inline single ref top blocks optimization to cell query
_hcs_disable_latest_compat_checkFALSEskip compatibility check for latest compatible version
_hcs_disable_level_ordFALSEprune away MAX(MAX(...)) around level order columns
_hcs_disable_level_pruneFALSEperform all level pruning
_hcs_disable_level_prune_calc_data_joinsFALSEperform level pruning for joins across calc data
_hcs_disable_level_prune_hier_joinFALSEperform level pruning from hierarchy joins
_hcs_disable_level_prune_hier_qryFALSEperform level pruning from hierarchy queries
_hcs_disable_level_prune_hierarchizeFALSElevel prune hierarchize
_hcs_disable_level_prune_in_qryFALSEperform level pruning from level IN conditions
_hcs_disable_level_prune_mbr_lookupFALSEperform level pruning in member lookup queries
_hcs_disable_materializeFALSEadd materialize to result cache hint
_hcs_disable_mdx_cache_hintFALSEgenerate hcs query mdx cache hints
_hcs_disable_merge_fltr_star_optFALSEdisable merge filter star optimization
_hcs_disable_mv_rewrite_checkFALSEskip MV rewrite check when generating for ANALYTIC VIEW cache
_hcs_disable_no_bdfltrd_optFALSEapply no base data filtered optimization
_hcs_disable_obj_cache_nameFALSEDo not include the object number in an aggregate or level cache
_hcs_disable_opt_cell_qryFALSEoptimize cell query
_hcs_disable_opt_estimateFALSEgenerate opt estimate hints
_hcs_disable_prune_unslvd_star_optFALSEdisable prune unsolved star optimization
_hcs_disable_result_cache_hintFALSEgenerate hcs query result cache hints
_hcs_disable_rm_like_withs_optzFALSEskip like WITH element removal optimization on generated SQL
_hcs_disable_rm_unused_withs_optzFALSEskip unused WITH element removal optimization on generated SQL
_hcs_disable_smooth_descendantsFALSEperform smooth descendants
_hcs_disable_smooth_drill_allFALSEperform smooth drill all
_hcs_disable_smooth_hierarchizeFALSEperform hierarchize smoothing
_hcs_disable_smooth_noop_descendantsFALSEperform smooth no-op descendants
_hcs_disable_smooth_remove_allFALSEsmooth and remove ALL member
_hcs_disable_sql_plan_baselinesFALSEdisable sql plan baselines
_hcs_disable_unnestFALSEdisable unnest hint
_hcs_disable_use_cache_star_optFALSEdisable use cache star optimization
_hcs_disable_vector_transformFALSEdisable vector transform hint
_hcs_disable_view_mergeFALSEdisable view merge
_hcs_disable_vis_totalsFALSEgenerate visual totals
_hcs_disable_xform_gbyFALSEdisable transform group by
_hcs_enable_adwFALSEenable ADW
_hcs_enable_aggr_opt_estimateFALSEapply OPT_ESTIMATE hint to aggregation queries
_hcs_enable_all_distinctFALSEuse distinct instead of rownum=1
_hcs_enable_auto_av_cacheFALSEuse dynamic across all levels cache
_hcs_enable_av_auto_cacheFALSEenable AV auto-cache
_hcs_enable_basetbl_transformFALSEenable base table transform
_hcs_enable_code_trcFALSEenable code tracing
_hcs_enable_cube_joinFALSEenable cube join
_hcs_enable_expose_with_exprFALSEexpose internal with_expression
_hcs_enable_fact_rowsFALSEenable fact rows
_hcs_enable_in_mem_cdt_hintFALSEadd hint opt_param('_in_memory_cdt', 'off')
_hcs_enable_mdx_cache_name_colFALSEadd column for mdx cache name
_hcs_enable_mdx_mv_genFALSEenable mdx mv cache SQL generation
_hcs_enable_mdx_sleep_after_pinFALSEsleep after pinning MDX caches
_hcs_enable_no_expandFALSEenable no expand hint
_hcs_enable_parallel_hintFALSEinclude parallel hint in cell query
_hcs_enable_parse_auto_av_cacheFALSEallow parsing of dynamic across all levels cache
_hcs_enable_pred_pushTRUEenable optimizer AV predicate pushing via reparse
_hcs_enable_unsupported_calcsFALSEenable unsupported calcs
_hcs_log_max_segments1000maximum number of HCS log segments, 0 for unlimited
_hcs_log_segment_size10HCS log segment size in MB
_hcs_loggingSUMMARYanalytic view logging
_hcs_max_mdx_cursors100maximum number of MDX cursors
_hcs_mdx_sim_sga_alloc_errNONEsimulate mdx sga allocation error
_hcs_mdx_sim_so_failFALSEsimulate state object failure
_hcs_mdx_sleep_locNONEmdx location to sleep for testing
_hcs_query_hintquery hint
_hcs_sim_sqlopt_errFALSEsimulate sql optimization error
_hcs_stats_max_card2000000maximum value for stats cardinality
_heap_dump_timeout60timeout in seconds for heap dump
_heartbeat_configNONETDE heartbeat configuration parameter
_heartbeat_period_multiplier0Multiplier for the period of the TDE heartbeat
_heatmap_format_1blockFALSEheatmap related - to be used by oracle dev only
_heatmap_min_maxsize0Internal testing only
_heur_deadlock_resolution_secs0the heuristic wait time per node for deadlock resolution
_high_intrinsic_scn_growth_alert1440high intrinsic SCN growth rate alert time in minutes
_high_priority_node_instcnt_capFALSEdisable high priority lms when node inst count exceeds cap
_high_priority_processesLGWRLMS*
_high_threshold_delta65535high threshold delta
_highest_priority_processesVKTMHighest Priority Process Name Mask
_highres_drift_allowed_sec1allowed highres timer drift for VKTM
_highthreshold_undoretention31536000high threshold undo_retention in seconds
_hj_bit_filter_threshold50hash-join bit filtering threshold (0 always enabled)
_hm_analysis_oradebug_sys_dump_level0the oradebug system state level for hang manager hang analysis
_hm_xm_enabledTRUEIf TRUE, DIA0 allows message exchanges across DB/ASM boundary
_hpk_compression_range5hpk compression range
_hpk_project_cost_weighting20hpk project cost weighting
_hpk_throughput_range5hpk throughput range
_hstpr_prediction_interval10080resource SO prediction interval
_hstpr_use_linear_predictionTRUEuse session SO lin-reg prediction
_hstpr_use_periodic_predictionTRUEuse session SO periodic prediction
_http_port0HTTP port number registered with local listener
_hugetlbfs_mount_point_for_sgaHugeTLBFS mount point to be used
_hw_watchpoint_onTRUEis the HW watchpointing feature turned on?
_hwm_sync_threshold10HWM synchronization threshold in percentage
_iat_frequency_shortFALSEUse short interval (5 minutes) for inactive account time job
_idle_session_kill_enabledTRUEenables or disables resource manager session idle limit checks
_idle_session_scan_frequency60Idle session scan frequency (in seconds)
_idxrb_rowincr100000000proportionality constant for dop vs. rows in index rebuild
_ignore_desc_in_indexFALSEignore DESC in indexes, sort those columns ascending anyhow
_ignore_edition_enabled_for_EV_creationFALSEignore schema's edition-enabled status during EV creation
_ignore_fg_depsignore fine-grain dependencies during invalidation
_ignore_pdb_listenerFALSEignore pdb listener
_ignore_svc_name_conv_mismatchFALSESuppress ORA-65174 for service_name_convert clause mismatch
_ilm_mem_limit10percentage of the max shared pool heat-map can use - internal
_ilmflush_stat_limit0ILM flush statistics limit - Internal testing only
_ilmset_stat_limit0ILM set statistics limit - Internal testing only
_ilmstat_memlimit5Percentage of shared pool for use by ILM Statistics
_imado_diagtasks_log_period5IM-ADO diagnostic tasks logging period (in seconds)
_imado_diagtasks_purge_period30IM diagnostic tasks purge older than X days
_imado_disable_bgFALSEDisable AIM background task for testing
_imado_enable_coloptimTRUEEnable AIM Column level optimizations
_imado_enhancements0AIM enhancements
_imado_evict_sf2AIM evict safety factor
_imado_mem_threshold98Memory threshold percent for AIM action
_imado_optim_algoGREEDYOptimization algorithm for AIM
_imado_optimize_period0IM-store optimize period for AIM (in minutes)
_imado_sysaux_usage_limit90SYSAUX usage percent limit for storing AIM diagnostics
_imado_verification0AIM verification state
_image_redo_gen_delay0Image redo generation delay in centi-seconds (direct write mode)
_immediate_commit_propagationTRUEif TRUE, propagate commit SCN immediately
_improved_outerjoin_cardTRUEimproved outer-join cardinality calculation
_improved_row_length_enabledTRUEenable the improvements for computing the average row length
_imr1_slave1IMR1 slave
_imr_activeTRUEActivate Instance Membership Recovery feature
_imr_avoid_double_votingTRUEAvoid device voting for CSS reconfig during IMR
_imr_check_css_incarnation_numberTRUEIMR verify the global consistency of CSS incarnation number
_imr_controlfile_access_wait_time10IMR controlfile access wait time in seconds
_imr_dd_slave_wait_time30IMR max time LMON will wait for slave response in seconds
_imr_device_typecontrolfileType of device to be used by IMR
_imr_disk_voting_interval3Maximum wait for IMR disk voting (seconds)
_imr_diskvote_implementationautoIMR disk voting implementation method
_imr_evicted_member_killTRUEIMR issue evicted member kill after a wait
_imr_evicted_member_kill_wait20IMR evicted member kill wait time in seconds
_imr_extra_reconfig_wait10Extra reconfiguration wait in seconds
_imr_highload_thresholdIMR system highload threshold
_imr_largest_hub_membershipTRUEIMR will derive the largest hub membership from available votes
_imr_max_reconfig_delay75Maximum Reconfiguration delay (seconds)
_imr_mount_retry_wait_time20IMR mount retry wait time (seconds)
_imr_non_blocking_device_driverTRUEUse the Non Blocking IMR Device Driver Implementation
_imr_remount_retry_wait_time60IMR remount retry wait time in (seconds)
_imr_rim_mount_deviceFALSEEnable rim instances to mount IMR device driver
_imr_rr_holder_kill_time300IMR max time instance is allowed to hold RR lock in seconds
_imr_slave_debug0IMR slave debug flags
_imr_splitbrain_res_wait0Maximum wait for split-brain resolution (seconds)
_imr_systemload_checkTRUEPerform the system load check during IMR
_imtxn_table_enableTRUEis In-Memory Txn Table cache enabled
_imtxn_table_flags3In-Memory Txn Table cache flags
_imtxn_table_max_inc_per_slt1In-Memory Txn Table number of incarnations per slot
_imtxn_table_max_slts_per_seg34In-Memory Txn Table Slots per Undo Segment
_imtxn_table_max_undo_segs1024In-Memory Txn Table Max Undo Segments in Cache
_imtxnrma_table_enableFALSEis In-Memory RMA Txn Table cache enabled
_imtxnrma_table_flags0In-Memory RMA Txn Table cache Flags
_imu_pools3in memory undo pools
_in_memory_cdtLIMITEDIn Memory CDT
_in_memory_cdt_maxpx4Max Parallelizers allowed for IMCDT
_in_memory_cleanup_wait_timeout10000Tiemout for IMCDT cleanup waiting for end of scan
_in_memory_memory_threshold40In Memory CDT memory threshold
_in_memory_tbs_searchTRUEFALSE - disable fast path for alter tablespace read only
_in_memory_ts_onlyOFFIn Memory CDT use temp segment only
_in_memory_undoTRUEMake in memory undo for top level transactions
_increase_lmd_process0modifying this hidden parameter, will modify the numberof lmd process by the valueof this parameter
_increase_lms_process0modifying this hidden parameter, will modify the numberof lms process by the valueof this parameter
_incremental_purge_size200Setting for AWR Incremental Purge Size
_incremental_recovery_ckpt_min_batch500minimum number of writes for incremental recovery ckpt every second
_index_alert_key_not_foundFALSEdumps 8102 error to alert log file
_index_join_enabledTRUEenable the use of index joins
_index_load_analysis_frequency4index load compression analysis frequency
_index_load_buf_oltp_over_retry0index load buf and comp oltp over-estimation retry
_index_load_buf_oltp_sacrifice_pct10index load buf oltp sacrifice pct
_index_load_buf_oltp_under_pct85index load buf and comp oltp under-estimation pct
_index_load_last_leaf_comp85index load write last leaf compression threshold
_index_load_min_key_count10index load min key count for first compression
_index_max_inc_trans_pct20max itl expand percentage soft limit during index insert
_index_partition_large_extentsFALSEEnables large extent allocation for partitioned indices
_index_partition_shrink_optTRUEenable alter index modify partition shrink optimization
_index_prefetch_factor100index prefetching factor
_index_scan_check_skip_corruptFALSEcheck and skip corrupt blocks during index scans
_index_scan_check_stopkeyFALSEcheck stopkey during index range scans
_index_split_chk_cancel5index insert split check cancel
_indexable_con_idTRUEindexing of CON_ID column enabled for X$ tables
_indoubt_pdb_transactions_force_outcomeCOMMITcommit force or rollback force during undo mode switch
_inet_cluster_interconnectsInetTable Cluster Interconnects
_influx_scn_wait_timeout1active dataguard influx scn wait time in centiseconds
_influx_scn_waits100000active dataguard influx scn maximum waits
_init_granule_interval10number of granules to process for deferred cache
_init_sql_file?/rdbms/admin/sql.bsqFile containing SQL statements to execute upon database creation
_inject_simulated_error_period131072if non-zero, inject IO error once every param_value times
_inject_startup_fault0inject fault in the startup code
_inline_sql_in_plsqlFALSEinline SQL in PL/SQL
_inmemory_64k_percent30percentage of in-memory area for 64k pools
_inmemory_adg_batched_flushTRUEIf true, batched flush is performed
_inmemory_adg_journal_quotaFALSEIf true, throttled mining is performed under space pressure
_inmemory_adg_parallel_flushTRUEIf true, parallel flush is performed
_inmemory_adg_periodic_sortFALSEIf true, periodic sort is performed
_inmemory_adg_quiesce_timeout2timeout for getting ZQ enq
_inmemory_analyzer_optimize_for0inmemory analyzer optimize for
_inmemory_auto_distributeTRUEIf true, enable auto distribute
_inmemory_autodist_2safeFALSEIf true, enable auto distribute with 2safe
_inmemory_buffer_waittime100wait interval for one SMU or IMCU to be freed
_inmemory_check_prot_metaFALSEIf true, marks SMU area read only to prevent stray writes
_inmemory_checksumFALSEIf true, checksums in-memory area to detect stray writes
_inmemory_crclone_buffer_size131072In-memory CR Clone buffer size
_inmemory_crclone_min_clones6In-memory CR Clone minimum number of clones
_inmemory_crclone_min_space_percent50In-memory CR Clone minimum space percentage
_inmemory_crclone_threshold_rows100In-memory CR Clone threshold rows
_inmemory_cu_checksumFALSEIf true, checksums CU to detect stray writes
_inmemory_cudrop_timeout1000maximum wait time for IMCU to be freed during drop
_inmemory_dbg_scan0In-memory scan debugging
_inmemory_default_flags8459Default flags based on inmemory_clause_default
_inmemory_default_newFALSEForce in-memory on new tables
_inmemory_default_svc0Default In-Memory distribute service type for new tables
_inmemory_default_svcnameDefault In-Memory distribute service name for new tables
_inmemory_delta_population0Control Delta IMCU population
_inmemory_direct_reads1direct-reads for SMUs population repopulation
_inmemory_disable_alter_imco_cycleFALSEin-memory disable alter imco cycle
_inmemory_disable_selective_vircolsFALSEdisable selective columns for VCs/IMEs
_inmemory_distribute_ondemand_timeout300On demand timeout for redistribute
_inmemory_distribute_timeout300If true, enable auto distribute with 2safe
_inmemory_drcancel_cu_percent80IMCU percentage threshold to switch from DR to BC
_inmemory_dynamic_scan_disable_threshold20Inmemory dynamic scan disable threshold
_inmemory_dynamic_scansAUTOEnable IM Dynamic Scans
_inmemory_dynamic_scans_analyze_batch_size5Inmemory dynamic scan analyze batch size
_inmemory_dynamic_scans_batch_size500Number of steady state outstanding tasks
_inmemory_dynamic_scans_dbg0Inmemory dynamic scans debug
_inmemory_dynamic_scans_result_buffers5000No. of LWT allocated result buffers per thread
_inmemory_enable_population_verify1verify in-memory population
_inmemory_enable_readonlyTRUEEnable Inmemory on read only DB instance
_inmemory_enable_stat_alertFALSEdump in-memory stats in alert log file
_inmemory_enable_sysFALSEenable in-memory on system tablespace with sys user
_inmemory_exclto_timeout100maximum wait time to pin SMU for cleanout
_inmemory_expression_count20IME number of expressions to lookup from the ESS
_inmemory_expressions_area_percent10percentage of in-memory area for IMEUs
_inmemory_expressions_mark_unusedFALSEMark cold IME expressions unused instead of no inmemory
_inmemory_ext_roarea0size in bytes of inmemory rw extension area
_inmemory_ext_rwarea0size in bytes of inmemory rw extension area
_inmemory_external_tableTRUEEnable inmemory extern table
_inmemory_faststart_control_flags0in-memory faststart control flags
_inmemory_force_fsFALSEin-memory faststart force
_inmemory_force_fs_tbsSYSAUXin-memory faststart force tablespace
_inmemory_force_fs_tbs_size1073741824in-memory faststart force tablespace size
_inmemory_force_non_engineeredFALSEforce non-engineered systems in-memory behavior on RAC
_inmemory_format_compatible19.0.0In-memory format compatibility parameter
_inmemory_fs_blk_inv_blk_percent50in-memory faststart CU invalidation threshold(blocks)
_inmemory_fs_blk_inv_blkcntin-memory faststart CU invalidation threshold(blocks)
_inmemory_fs_dmlverify_read_ahead_cnt10in-memory faststart dmlverify read ahead count
_inmemory_fs_enableTRUEin-memory faststart enable
_inmemory_fs_enable_blk_lvl_invTRUEin-memory faststart enable block level invalidation
_inmemory_fs_nodmlFALSEin-memory faststart assumes no dmls while populating
_inmemory_fs_prune_pct10in-memory faststart out of mem prune percent
_inmemory_fs_raise_errorFALSEin-memory faststart raise error
_inmemory_fs_tbsmaxszin-memory faststart tablespace maximum size
_inmemory_fs_verifyFALSEin-memory faststart verify
_inmemory_fsdw_cnt2147483647in-memory faststart defer writes per cycle
_inmemory_fsdw_enableTRUEin-memory faststart deferwrite enable
_inmemory_fsdw_inlineFALSEin-memory faststart deferwrite inline
_inmemory_fsdw_maxcnt10in-memory faststart max defer writes per cycle
_inmemory_fsdw_maxmem104755200in-memory faststart max defer writes memory cap
_inmemory_fsdw_on_populateTRUEin-memory faststart deferwrite on populate
_inmemory_fsdw_penalty_threshold20in-memory faststart deferwrite penalty threshold
_inmemory_fsdw_populate_threshold_multiplier10in-memory faststart deferwrite populate threshold multiplier
_inmemory_fsdw_priority_penalty_percent10In-memory faststart defer write percent priority for penalized
_inmemory_fsdw_priority_population_percent100In-memory faststart defer write percent priority for population
_inmemory_fsdw_priority_repopulation_percent90In-memory faststart defer write percent priority for repopulation
_inmemory_fsdw_schedlrtm1in-memory faststart defer write scheduler cycle (sec)
_inmemory_fsdw_scheduler_dedicatedFALSEin-memory faststart defer write dedicated scheduler
_inmemory_fsdw_task_timeout20in-memory faststart defer writes task timeout (sec)
_inmemory_fsdw_threshold300In-memory faststart defer write minimum interval (millisec)
_inmemory_granule_size134217728In-memory granule size
_inmemory_grpcolinv_buffer_size131072In-memory grpcolinv buffer size
_inmemory_grpcolinv_granularity1In-memory grpcolinv blks per colmap
_inmemory_hpk4sql_debug0In-Memory HPK4SQL debug
_inmemory_hpk4sql_filter_threshold1In-Memory HPK4SQL filter threshold
_inmemory_hpk4sql_flags0In-Memory HPK4SQL flags
_inmemory_hpk4sql_kv_seg_size0In-Memory HPK4SQL kv segment size
_inmemory_hpk4sql_partbuf_maxrow1024In-Memory HPK4SQL partbuf maxrow
_inmemory_hpk4sql_partbuf_minrow8In-Memory HPK4SQL partbuf minrow
_inmemory_hwm_expand_percent20max blks percent can exceed in hwmimcu
_inmemory_hwm_expansion1If 0, the highwatermark CU is dropped when expanded
_inmemory_hwm_expansion_rac0If 0, the highwatermark CU is dropped when expanded
_inmemory_hwm_inv_blocks_threshold64If 0, expansion will occur even for very small hwm imcu
_inmemory_hybrid_selectivity_threshold37Selectivity threshold for a qualifying query to enable hybrid IM scans
_inmemory_imco_cycle120IMCO cycle in seconds (sleep period)
_inmemory_imcu_alignTRUEEnforce 8M IMCU alignment
_inmemory_imcu_populate_minbytes5242880minimum free space in IMA for populating IMCU
_inmemory_imcu_source_analyze_bytes134217728number of source analyze bytes per IMCU
_inmemory_imcu_source_blocks0number of source blocks per IMCU
_inmemory_imcu_source_extents0number of source extents per IMCU
_inmemory_imcu_source_maxbytes536870912IMCU maximum source size in bytes
_inmemory_imcu_source_minbytes1048576number of minimum source bytes per IMCU
_inmemory_imcu_target_bytes0IMCU target size in bytes
_inmemory_imcu_target_maxrows8388608IMCU maximum target number of rows
_inmemory_imcu_target_rows0IMCU target number of rows
_inmemory_ime_increpop_threshold1Invalidation threshold for IME incremental repopulation
_inmemory_incremental_repopulationTRUEIf true, incremental repopulation of IMCU will be attempted
_inmemory_invalidate_cursorsTRUEIn-memory populate enable cursor invalidations
_inmemory_journal_check0Depending on value does one of the DML verifications
_inmemory_journal_cla_stride4inmemory journal format cla stride
_inmemory_journal_format1inmemory journal format options
_inmemory_journal_row_loggingFALSEIf true, log the entire row into the in-memory journal
_inmemory_journal_scan0inmemory journal scan enable
_inmemory_journal_scan_formatTRUEIf true, the set journal format will be used for scan
_inmemory_lock_for_smucreateFALSEtake object lock during smu creation
_inmemory_log_level0in-memory log level
_inmemory_max_delta5Inmemory max number of deltas per CU
_inmemory_max_expressions_table50IME maximum number of SYS_IME VCs in a table
_inmemory_max_populate_retry3IM populate maximum number of retry
_inmemory_max_queued_tasks0Maximum queued populating tasks on the auxiliary queue
_inmemory_memprotFALSEenable or disable memory protection for in-memory
_inmemory_min_delta_blocks50Inmemory minimum blocks per delta
_inmemory_min_delta_rows255Inmemory minimum rows per delta
_inmemory_min_ima_defersize0Defer in-memory area allocation beyond this size
_inmemory_num_hash_latches256Maximum number of latches for IM buffers
_inmemory_opaque_contig_space_percent80Contiguous memory for opaque VC as a percent of hard maximum
_inmemory_parallel_load_extTRUEParallel load inmemory extern table
_inmemory_partrowlock_threshold10Number of committed rows that stay not cleaned out
_inmemory_patch_background_blocks200In-memory SMU patch threshold blocks to start background tasks
_inmemory_patch_commit_pathFALSEIf true, enable the SMU patching from DML path
_inmemory_patch_threshold_blocks25In-memory SMU patch threshold blocks
_inmemory_pct_inv_blocks_invalidate_imcu100In-memory percentage invalid blocks for IMCU invalidation
_inmemory_pct_inv_rows_invalidate_imcu50In-memory percentage invalid rows for IMCU invalidation
_inmemory_pga_per_server536870912minimum pga needed per inmemory populate server
_inmemory_pin_hist_mode16settings for IM pinned buffer history
_inmemory_populate_blocks_threshold8If 0, scan triggers populate for any missing blocks
_inmemory_populate_fgFALSEpopulate in foreground
_inmemory_populate_waitFALSEwait for population to complete
_inmemory_populate_wait_max600maximum wait time in seconds for segment populate
_inmemory_prefer_xmem_memcompressPrefer to store tables with given memcompress levels in xmem
_inmemory_prefer_xmem_priorityPrefer to store tables with given priority levels in xmem
_inmemory_prefix_encode_dsbsFALSEPrefix-encode the DSB-dictionary
_inmemory_prepopulateTRUEEnable inmemory populate by IMCO
_inmemory_prepopulate_fg0Force prepopulate of in-memory segment in foreground
_inmemory_private_journal_maxexts5000000Max number of extents per PJ
_inmemory_private_journal_numbkts512Number of priv jrnl ht bkts
_inmemory_private_journal_numgran255Number of granules per HT node
_inmemory_private_journal_quota100quota for transaction in-memory private journals
_inmemory_private_journal_sharedpool_quota20quota for transaction in-memory objects
_inmemory_pruningONIn-memory pruning
_inmemory_query_check0In-memory query checking
_inmemory_query_fetch_by_rowidFALSEIn-memory fetch-by-rowid enabled
_inmemory_query_scanTRUEIn-memory scan enabled
_inmemory_relimcusz_thresh25in-memory relative imcusz thresh for direct reads
_inmemory_repopulate_disable2disable In-memory repopulate
_inmemory_repopulate_flags2In-memory repopulate decision flags
_inmemory_repopulate_invalidate_rate_percent0In-memory repopulate invalidate rate percent
_inmemory_repopulate_optimizeTRUEIf true, itl transfer will be attempted during repopulation of IMCU
_inmemory_repopulate_priority_scale_factor100In-memory repopulate priority threshold scale factor
_inmemory_repopulate_priority_threshold_block320In-memory repopulate priority threshold block
_inmemory_repopulate_priority_threshold_row160In-memory repopulate priority threshold row
_inmemory_repopulate_threshold_blocksIn-memory repopulate threshold number of modified blocks
_inmemory_repopulate_threshold_blocks_percent10In-memory repopulate threshold blocks invalid percentage
_inmemory_repopulate_threshold_mintime0In-memory repopulate minimum interval (millisec)
_inmemory_repopulate_threshold_mintime_factor5In-memory repopulate minimum interval (N*timetorepop)
_inmemory_repopulate_threshold_rowsIn-memory repopulate threshold number of modified rows
_inmemory_repopulate_threshold_rows_percent5In-memory repopulate threshold rows invalid percentage
_inmemory_repopulate_threshold_scans0In-memory repopulate threshold number of scans
_inmemory_retention_time120maximum retention time of imcu after repopulation
_inmemory_rows_check_interrupt1000Number of rows buffered before interrupt check
_inmemory_scan_invalid_percent30Inmemory scan invalid percentage
_inmemory_scan_overrideFALSEIn-memory scan override
_inmemory_servers_throttle_pgalim_percent55In-memory populate servers throttling pga limit percentage
_inmemory_shared_journal_maxexts1024Max number of extents per SJ
_inmemory_shared_journal_minexts_repop256min number of extents per SJ to trigger repop
_inmemory_small_segment_threshold65536In-memory small segment threshold (must be larger for in-memory)
_inmemory_smu_patch_options7Inmemory SMU patching options
_inmemory_strdlxid_timeout0max time to determine straddling transactions
_inmemory_subcu_histsize0In-memory subCU Histogram size
_inmemory_subcusize512In-memory subCU size
_inmemory_suppress_vsga_imaFALSESuppress inmemory area in v$sga
_inmemory_test_verification0In-memory verification testing
_inmemory_transaction_options2806in-memory transaction performance options
_inmemory_trickle_populateTRUEEnable inmemory trickle populate
_inmemory_trickle_repopulateTRUEEnable inmemory trickle repopulate
_inmemory_trickle_repopulate_fg0Trickle Repopulate in the Foreground
_inmemory_trickle_repopulate_min_interval300IMCO Trickle Repopulate Interval
_inmemory_trickle_repopulate_threshold_dirty_ratio0IMCO Trickle Repopulate threshold dirty ratio
_inmemory_txn_checksum0checksum for SMUs and private journals
_inmemory_txnpjrnl_debug0txn priv jrnl debugging parameter
_inmemory_validate_fetchFALSEIf true, validate single-row fetch between in-memory and disk
_inmemory_vector_encode_overrideFALSEPopulate and use DSBs for Vector Encode columns
_inmemory_waitinvis_count8in-memory waitinvisible retry count
_inmemory_xmem_size0size in bytes of in-memory xmem area
_inplace_update_retryTRUEinplace update retry for ora1551
_inquiry_retry_interval3if greater than 0 enables inquiry retry after specified interval
_insert_enable_hwm_brokeredTRUEduring parallel inserts high water marks are brokered
_inst_locking_period5period an instance can retain a newly acquired level1 bitmap
_instance_dbnest_nameInstance dbNest Name
_instance_recovery_bloom_filter_fprate0Allowable false positive percentage [0-100]
_instance_recovery_bloom_filter_size83886080Bloom filter size (in num of bits) used during claim phase
_instant_file_createFALSEenable instant file creation on sparse media
_instant_file_create_exascaleFALSEenable instant file creation on Exascale
_intra_cdb_dblinkFALSEenable intra CDB implicit dblink
_intrapart_pdml_enabledTRUEEnable intra-partition updates/deletes
_intrapart_pdml_randomlocal_enabledTRUEEnable intra-partition updates/deletes with random local dist
_invalidate_upon_revokeTRUEInvalidate all dependent objects upon revoke
_io_internal_test0I/O internal testing parameter
_io_osd_param1OSD specific parameter
_io_outlier_threshold500Latency threshold for io_outlier table
_io_resource_manager_always_onFALSEio resource manager always on
_io_shared_pool_size4194304Size of I/O buffer pool from SGA
_io_slaves_disabledFALSEDo not use I/O slaves
_io_statisticsTRUEif TRUE, ksfd I/O statistics are collected
_iocalibrate_init_ios2iocalibrate init I/Os per process
_iocalibrate_max_ios0iocalibrate max I/Os per process
_ioq_fanin_multiplier2IOQ miss count before a miss exception
_ior_serialize_fault0inject fault in the ior serialize code
_iorm_tout1000IORM scheduler timeout value in msec
_ios_root_directoryIOSIOS default root directory
_ioslave_batch_count1Per attempt IOs picked
_ioslave_issue_count500IOs issued before completion check
_ipc_aggr_limit_percentage40KSIPC memory as a percentage of PGA aggregate limit
_ipc_config_opts_dyn0Dyn config for ipclw startup
_ipc_config_opts_stat0static config for ipclw startup
_ipc_emu_aop_timeout0static emu AOP tinmeout
_ipc_fail_network0Simulate cluster network failer
_ipc_switch_reconfig_neededFALSEto trigger a ipc switch reconfiguration
_ipc_test_failover0Test transparent cluster network failover
_ipc_test_mult_nets0simulate multiple cluster networks
_ipddb_enableFALSEEnable IPD/DB data collection
_iut_enableTRUEControl Index usage tracking
_iut_max_entries30000Maximum Index entries to be tracked
_iut_stat_collection_typeSAMPLEDSpecify Index usage stat collection type
_job_queue_interval5Wakeup interval in seconds for job queue co-ordinator
_k2q_latches0number of k2q latches
_ka_allow_reenableFALSEreenability of kernel accelerator service after disable
_ka_compatibility_requirementallkernel accelerator compatibility operation requirement
_ka_doorbell0kernel accelerator doorbell mode
_ka_enabledFALSEEnable/disable kernel accelerator
_ka_grant_policyAUTOKA grant policy to favor fusion grant, make it automatic, or favor KA
_ka_lma_msg_wait_count100KA maximum number of requests to retrieve per OSD wait by LMA
_ka_lma_wait_time200KA wait time for skjcxWait call by LMA process in microseconds
_ka_locks_per_sector12locks per sector in kernel accelerator
_ka_max_wait_delay1000KA maximum amount of time before forcing OSD wait call
_ka_mode0kernel accelerator mode
_ka_msg_reap_count40maximum number of KA messages to receive and process per wait
_ka_msg_wait_count20KA maximum number of requests to retrieve per OSD wait
_ka_pbatch_messagesTRUEkernel accelerator perform pbatch messages
_ka_scn_accel_shrmemTRUEKA SCN accelerate shr memory
_ka_scn_enabledFALSEKA SCN processing enabled
_ka_scn_use_ka_msgsTRUEKA SCN use KA type messages
_kcb_reused_max16384reused array max parameter
_kcbl_assert_reset_slotTRUEassert slot state in kcblResetSlot
_kcfis_automem_level1Set auto memory management control for kcfis memory allocation
_kcfis_block_dump_level0Smart IO block dump level
_kcfis_byteswap_opt_disabledFALSEDon't use byte swapping optimization on the storage cell
_kcfis_caching_enabledTRUEenable kcfis intra-scan session caching
_kcfis_cell_passthru_dataonlyTRUEAllow dataonly passthru for smart scan
_kcfis_cell_passthru_enabledFALSEDo not perform smart IO filtering on the cell
_kcfis_cell_passthru_fromcpu_enabledTRUEEnable automatic passthru mode when cell CPU util is too high
_kcfis_cellcache_disabledFALSEDon't use cellcache rewrite optimization on the storage cell
_kcfis_celloflsrv_passthru_enabledFALSEEnable offload server usage for passthru operations
_kcfis_celloflsrv_usage_enabledTRUEEnable offload server usage for offload operations
_kcfis_control10Kcfis control1
_kcfis_control20Kcfis control2
_kcfis_control30Kcfis control3
_kcfis_control40Kcfis control4
_kcfis_control50Kcfis control5
_kcfis_control60Kcfis control6
_kcfis_disable_platform_decryptionFALSEDon't use platform-specific decryption on the storage cell
_kcfis_dump_corrupt_blockTRUEDump any corrupt blocks found during smart IO
_kcfis_fast_response_enabledTRUEEnable smart scan optimization for fast response (first rows)
_kcfis_fast_response_initiosize2Fast response - The size of the first IO in logical blocks
_kcfis_fast_response_iosizemult4Fast response - (next IO size = current IO size * this parameter)
_kcfis_fast_response_threshold1048576Fast response - the number of IOs after which smartIO is used
_kcfis_fastfileinit_disabledFALSEDon't use ffi during file creation
_kcfis_fault_control0Fault Injection Control
_kcfis_io_prefetch_size8Smart IO prefetch size for a cell
_kcfis_ioreqs_throttle_enabledTRUEEnable Smart IO requests throttling
_kcfis_kept_in_cellfc_enabledTRUEEnable usage of cellsrv flash cache for kept objects
_kcfis_large_payload_enabledFALSEenable large payload to be passed to cellsrv
_kcfis_max_cached_sessions10Sets the maximum number of kcfis sessions cached
_kcfis_max_out_translations5000Sets the maximum number of outstanding translations in kcfis
_kcfis_nonkept_in_cellfc_enabledFALSEEnable use of cellsrv flash cache for non-kept objects
_kcfis_oss_io_size0KCFIS OSS I/O size
_kcfis_pmem_enabledTRUERDMA Persistent Memory support enabled
_kcfis_qm_prioritize_sys_planTRUEPrioritize Quaranitine Manager system plan
_kcfis_qm_user_plan_nameQuaranitine Manager user plan name
_kcfis_rdbms_blockio_enabledFALSEUse block IO instead of smart IO in the smart IO module on RDBMS
_kcfis_read_buffer_limit0KCFIS Read Buffer (per session) memory limit in bytes
_kcfis_spawn_debuggerFALSEDecides whether to spawn the debugger at kcfis initialize
_kcfis_stats_level0sets kcfis stats level
_kcfis_storageidx_diag_mode0Debug mode for storage index on the cell
_kcfis_storageidx_disabledFALSEDon't use storage index optimization on the storage cell
_kcfis_storageidx_set_membership_disabledFALSEDon't use set membership optimization on the storage cell
_kcfis_storageidx_xtss_disabledFALSEDon't use storage index optimization on the storage cell for XTSS
_kcfis_test_control10kcfis tst control1
_kcfis_trace_bucket_size131072KCFIS tracing bucket size in bytes
_kcfis_xtgran_prefetch_count1External Table Smart Scan granule prefetch count
_kcl_debugTRUEif TRUE, record le history
_kcl_index_splitTRUEif TRUE, reject pings on blocks in middle of a split
_kcrfwrma_flags0KCRFWRMA Flags
_kd_dbg_control0kernel data generic control
_kd_rows_chkTRUEenable or disable row block check
_kd_symtab_chkTRUEenable or disable symbol table integrity block check
_kdbl_enable_post_allocationFALSEallocate dbas after populating data buffers
_kdfip_bufl_nbkt128memopt w buffers list buckets
_kdfip_cmap_nbkt16memopt w chunk map buckets
_kdfip_debug0memopt w debug
_kdfip_drain_sleeps60memopt w drain coord sleep count
_kdfip_elem_nclatch64memopt w chunkmap elem child latches
_kdfip_flush_nrows2147483647memopt w flush num rows
_kdfip_flush_rowsz1048576memopt w flush row size
_kdfip_flush_rowtm60memopt w flush time
_kdfip_iga_bufsz1048576memopt w write buffer size
_kdfip_iga_maxsz2147483648memopt w max global area size
_kdfip_iga_minsz268435456memopt w min global area size
_kdfip_par_flushTRUEmemopt w parallel flush
_kdfip_traceFALSEmemopt w tracing on-off
_kdfs_fix_control0dbfs fix_control
_kdfs_timer_dmpFALSEdbfs timers
_kdfs_trace1dbfs trace level
_kdfs_trace_size131072size of the uts buffer for generic traces
_kdi_avoid_block_checkingFALSEavoid index block checking on sensitive opcodes
_kdic_segarr_sz0size threshold for segmented arrays for seg_info_kdicctx
_kdis_reject_level24b+tree level to enable rejection limit
_kdis_reject_limit5#block rejections in space reclamation before segment extension
_kdis_reject_opsFALSEenable rejection heuristic for branch splits
_kdis_split_xid_pruneTRUEprune xids during an index split
_kdizoltp_uncompsentinal_freq16kdizoltp uncomp sentinal frequency
_kdkv_fg_drop_memoptTRUEhashindex foreground drop
_kdkv_fg_no_memoptFALSEhashindex foreground cleanup
_kdkv_fg_populateFALSEhashindex foreground populate
_kdkv_fg_repopulateFALSEhashindex foreground repopulate
_kdkv_force_fastpathFALSEkdkv fast path on-off
_kdkv_force_samehashFALSEkdkv hash to same bucket on-off
_kdkv_index_lossyTRUEhashindex lossiness on-off
_kdkv_index_relocateFALSEhashindex relocation on-off
_kdkv_indexinvalidFALSEobjd and rdba based index invalidation
_kdkv_traceFALSEkdkv tracing on-off
_kdlf_fast_move_compressed_lobTRUEkdlf fast move commpressed lobs
_kdlf_layers_cacheTRUEenable kdlf securefiles layers cache
_kdlf_read_flag0kdlf read flag
_kdli_STOP_bsz0undocumented parameter for internal use only
_kdli_STOP_dba0undocumented parameter for internal use only
_kdli_STOP_fsz0undocumented parameter for internal use only
_kdli_STOP_nio0undocumented parameter for internal use only
_kdli_STOP_tsn0undocumented parameter for internal use only
_kdli_adaptive_cache_inodeTRUEenable adaptive inode cache
_kdli_allow_corruptFALSEallow corrupt filesystem_logging data blocks during read/write
_kdli_buffer_injectTRUEuse buffer injection for CACHE [NO]LOGGING lobs
_kdli_cache_inodeTRUEcache inode state across calls
_kdli_cache_inode_off_limit8192cache_off limit for adaptive inode cache
_kdli_cache_read_threshold0minimum lob size for cache->nocache read (0 disables heuristic)
_kdli_cache_size8maximum #entries in inode cache
_kdli_cache_verifyFALSEverify cached inode via deserialization
_kdli_cache_write_threshold0minimum lob size for cache->nocache write (0 disables heuristic)
_kdli_cacheable_length0minimum lob length for inode cacheability
_kdli_checkpoint_flushFALSEdo not invalidate cache buffers after write
_kdli_dbcnoneoverride db_block_checking setting for securefiles
_kdli_delay_flushesTRUEdelay flushing cache writes to direct-write lobs
_kdli_descn_adjFALSEcoalesce extents with deallocation scn adjustment
_kdli_flush_cache_readsFALSEflush cache-reads data blocks after load
_kdli_flush_injectionsTRUEflush injected buffers of CACHE NOLOGGING lobs before commit
_kdli_force_crTRUEforce CR when reading data blocks of direct-write lobs
_kdli_force_cr_metaTRUEforce CR when reading metadata blocks of direct-write lobs
_kdli_force_storagenoneforce storage settings for all lobs
_kdli_full_readahead_threshold0maximum lob size for full readahead
_kdli_full_vllFALSEmaterialize full vll lobmap for reads
_kdli_icache_entries3size of itree cache
_kdli_inject_assert0inject asserts into the inode
_kdli_inject_batch0buffer injection batch size [1, KCBNEWMAX]
_kdli_inject_crash0inject crashes into the inode
_kdli_inline_xfmTRUEallow inline transformed lobs
_kdli_inode_preferencedatainline inode evolution preference (data, headless, lhb)
_kdli_inplace_overwrite0maximum inplace overwrite size (> chunksize)
_kdli_itree_entries0#entries in lhb/itree blocks (for testing only)
_kdli_memory_protectFALSEtrace accesses to inode memory outside kdli API functions
_kdli_mts_soTRUEuse state objects in shared server for asyncIO pipelines
_kdli_oneblkFALSEallocate chunks as single blocks
_kdli_preallocation_modelengthpreallocation mode for lob growth
_kdli_preallocation_pct0percentage preallocation [0 .. inf) for lob growth
_kdli_ralc_length10485760lob length threshold to trigger rounded allocations
_kdli_ralc_rounding1048576rounding granularity for rounded allocations
_kdli_rci_lobmap_entries255#entries in RCI lobmap before migration to lhb
_kdli_readahead_limit0shared/cached IO readahead limit
_kdli_readahead_strategycontigshared/cached IO readahead strategy
_kdli_recent_scnFALSEuse recent (not dependent) scns for block format/allocation
_kdli_reshapeFALSEreshape an inode to inline or headless on length truncation
_kdli_safe_callbacksTRUEinvoke inode read/write callbacks safely
_kdli_sio_asyncTRUEasynchronous shared IO
_kdli_sio_backoffFALSEuse exponential backoff when attempting SIOP allocations
_kdli_sio_bps0maximum blocks per IO slot
_kdli_sio_dop2degree-of-parallelism in the SIO keep pool
_kdli_sio_fbwrite_pct35percentage of buffer used for direct writes in flashback-db
_kdli_sio_fgioTRUEreap asynchronous IO in the foreground
_kdli_sio_fileopennoneshared IO fileopen mode: datasync vs nodatasync vs async
_kdli_sio_flushFALSEenable shared IO pool operations
_kdli_sio_freeTRUEfree IO buffers when not in active use
_kdli_sio_min_read0shared IO pool read threshold
_kdli_sio_min_write0shared IO pool write threshold
_kdli_sio_nbufs8maximum #IO buffers to allocate per session
_kdli_sio_niods8maximum #IO descriptors to allocate per session
_kdli_sio_onTRUEenable shared IO pool operations
_kdli_sio_pgaFALSEuse PGA allocations for direct IO
_kdli_sio_pga_topFALSEPGA allocations come from toplevel PGA heap
_kdli_sio_strategyextentshared IO strategy: block vs. extent
_kdli_sio_write_pct100percentage of buffer used for direct writes
_kdli_small_append_redoTRUEdetect and use redo optimizations for small appends
_kdli_small_cache_limit32size limit of small inode cache
_kdli_sort_dbasFALSEsort dbas during chunkification
_kdli_space_cache_limit2048maximum #blocks in per-segment space cache
_kdli_space_cache_segments16#segments in space cache
_kdli_squeezeTRUEcompact lobmap extents with contiguous dbas
_kdli_timer_dmpFALSEdump inode timers on session termination
_kdli_timer_trcFALSEtrace inode timers to uts/tracefile
_kdli_trace0inode trace level
_kdli_vll_directTRUEuse skip-navigation and direct-positioning in vll-domain
_kdlu_max_bucket_size4194304UTS kdlu bucket size
_kdlu_max_bucket_size_mts131072UTS kdlu bucket size for mts
_kdlu_trace_layer0UTS kdlu per-layer trace level
_kdlu_trace_system0UTS system dump
_kdlw_enable_ksi_lockingFALSEenable ksi locking for lobs
_kdlw_enable_write_gatheringTRUEenable lob write gathering for sql txns
_kdlwp_flush_threshold4194304WGC flush threshold in bytes
_kdlwp_memory_checkTRUEbug 31354021: memory diagnostics
_kdlxp_cmp_subunit_size262144size of compression sub-unit in bytes
_kdlxp_dedup_flush_threshold8388608deduplication flush threshold in bytes
_kdlxp_dedup_hash_algoSHA1secure hash algorithm for deduplication - only on SecureFiles
_kdlxp_dedup_inl_pctfree5deduplication pct size increase by which inlining avoided
_kdlxp_dedup_prefix_threshold1048576deduplication prefix hash threshold in bytes
_kdlxp_dedup_wapp_len0deduplication length to allow write-append
_kdlxp_lobcmpadpFALSEenable adaptive compression - only on SecureFiles
_kdlxp_lobcmplevel2Default securefile compression
_kdlxp_lobcmprciver1Default securefile compression map version
_kdlxp_lobcompressFALSEenable lob compression - only on SecureFiles
_kdlxp_lobdeduplicateFALSEenable lob deduplication - only on SecureFiles
_kdlxp_lobdedupvalidateTRUEenable deduplicate validate - only on SecureFiles
_kdlxp_lobencryptFALSEenable lob encryption - only on SecureFiles
_kdlxp_mincmp20minimum comp ratio in pct - only on SecureFiles
_kdlxp_mincmplen200minimum loblen to compress - only on SecureFiles
_kdlxp_minxfm_size32768minimum transformation size in bytes
_kdlxp_no_dedup_on_insertFALSEdisable deduplication for new inserts of deduplicated lobs
_kdlxp_spare10deduplication spare 1
_kdlxp_uncmpFALSElob data uncompressed - only on SecureFiles
_kdlxp_xfmcacheTRUEenable xfm cache - only on SecureFiles
_kdmado_partial_pop_backoff_mb64AIM Backoff for partial populate
_kdt_bufferingTRUEcontrol kdt buffering for conventional inserts
_kdtgsp_retries1024max number of retries in kdtgsp if space returns same block
_kdu_array_depth16array update retry recursion depth limits
_kdz_clear_analysis_percent60percentage to clear dictionary analysis
_kdz_hcc_flags0Miscellaneous HCC flags
_kdz_hcc_track_upd_ridsFALSEEnable rowid tracking during updates
_kdz_pcode_flags0pcode flags
_kdz_pred_nrows32767Number of rows to predicate at a time in kdzt
_kdz_proj_nrows1024Number of rows to project at a time in kdzt
_kdzk_enable_init_traceFALSEEnable kdzk initialization tracing
_kdzk_load_specialized_library3Flags for loading HPK specialized library
_kdzk_specialized_library_nameHPK specialized library name
_kdzk_trace_level0HPK trace level
_kebm_autotask_cont_resource_scheduleFALSEEnable/disable container resource schedule
_kebm_autotask_nstrikes3kebm # strikes to auto suspend an autotask
_kebm_max_parallel_autotasksAUTOmaximum parallel autotask executions per instance
_kebm_nstrikes3kebm # strikes to auto suspend an action
_kebm_preshut_act_enabledFALSEEnable/disable MMON Pre-shutdown Action
_kebm_sanity_check_enabledFALSEEnable/disable MMON Action Sanity Check
_kebm_suspension_time104400kebm auto suspension time in seconds
_kecap_cache_size10240Workload Replay INTERNAL parameter used to set memory usage in Application Replay
_keep_19907_during_recoveryFALSEkeep until scn within recovery target check in recovery
_keep_relocated_source_pdbFALSEMove source pdb to unplugged state after relocation
_keep_remote_column_sizeFALSEremote column size does not get modified
_kernel_message_network_driverFALSEkernel message network driver
_kes_parse_model2SQL Tune/SPA KES Layer Parse Model control parameter
_kewm_simulate_oer40310Simulate OER(4031) for one or more Metric Groups
_kewm_trace_sgaFALSEEnable/Disable Metrics SGA Allocation Tracing
_key_vector_alternate_dictionaryTRUEenables or disables key vector alternate dictionary generation
_key_vector_create_pushdown_threshold20000minimum grouping keys for key vector create pushdown
_key_vector_double_enabledTRUEenables or disables key vector support for binary_double
_key_vector_force_alternate_dictionaryFALSEstops key vector alternate dictionary from being disabled
_key_vector_join_pushdown_enabledTRUEenables or disables key vector join push down support
_key_vector_max_size0maximum key vector size (in KB)
_key_vector_offloadpredicatecontrols key vector offload to cells
_key_vector_predicate_enabledTRUEenables or disables key vector filter predicate pushdown
_key_vector_predicate_threshold0selectivity pct for key vector filter predicate pushdown
_key_vector_shared_dgk_htTRUEallows shared DGK hash table
_key_vector_timestamp_enabledTRUEenables or disables key vector support for timestamp
_kffmap_hash_size1024size of kffmap_hash table
_kffmlk_hash_size512size of kffmlk_hash table
_kffmof_fprate1acceptable false positive rate [1-10000] of the kffmof bloom filter
_kffmof_size1048576number of entries of the kffmof opened files bloom filter
_kffmop_chunks42number of chunks of kffmop's
_kffmop_hash_size2048size of kffmop_hash table
_kffmop_list_checkFALSEenable PGA mop list sanity check
_kffmspw_hash_size128size of kffmspw_hash table
_kfi_software_patchmapvalue of patchmap for software
_kfi_version_patchmappairs of version:patchmap for testing
_kfm_disable_set_fenceFALSEdisable set fence calls and revert to default (process fence)
_kgh_free_list_min_effort12typical number of free list chunks to visit
_kgh_restricted_subheaps180number of subheaps in heap restricted mode
_kgh_restricted_trace0trace level for heap dump-restricted mode
_kghdsidx_count1max kghdsidx count
_kgl_bucket_bitvectorTRUEEnable creation of PDB bit vector in KGL Hash Buckets
_kgl_bucket_bitvector_clearTRUEEnable clearing library cache bucket bit vector
_kgl_bucket_count9Library cache hash table bucket count (2^_kgl_bucket_count * 256)
_kgl_cluster_lockTRUELibrary cache support for cluster lock
_kgl_cluster_lock_read_mostlyFALSELibrary cache support for cluster lock read mostly optimization
_kgl_cluster_pinTRUELibrary cache support for cluster pins
_kgl_debugLibrary cache debugging
_kgl_fixed_extentsTRUEfixed extent size for library cache memory allocations
_kgl_hash_collisionFALSELibrary cache name hash collision possible
_kgl_heap_size4096extent size for library cache heap 0
_kgl_hot_object_copies0Number of copies for the hot object
_kgl_iterator_actionSKIPAction to take if we dereference in-flux state in kgl iterator
_kgl_kqr_cap_so_stacks0capture stacks for library and row cache state objects
_kgl_large_heap_assert_threshold524288000maximum heap size before KGL raises an internal error
_kgl_large_heap_warning_threshold52428800maximum heap size before KGL writes warnings to the alert log
_kgl_latch_count0number of library cache latches
_kgl_message_locks0RAC message lock count
_kgl_min_cached_so_count1Minimum cached SO count. If > 1 can help find SO corruptions
_kgl_time_to_wait_for_locks15time to wait for locks and pins before timing out
_kglsim_maxmem_percent5max percentage of shared pool size to be used for KGL advice
_kgsb_threshold_size16777216threshold size for base allocator
_kgx_latches1024# of mutex latches if CAS is not supported.
_kill_controlfile_enqueue_blockerTRUEenable killing controlfile enqueue blocker on timeout
_kill_diagnostics_timeout60timeout delay in seconds before killing enqueue blocker
_kill_enqueue_blocker2if greater than 0 enables killing enqueue blocker
_kill_java_threads_on_eocFALSEKill Java threads and do sessionspace migration at end of call
_kill_session_dumpFALSEProcess dump on kill session immediate
_kjac_direct_path_enabledTRUEIf direct path is enabled for TG
_kjac_force_outcome_current_sessionFALSEif TRUE, enable to run force outcome on the current session
_kjdd_call_stack_dump_enabledFALSEEnables printing of short call stack with the WFG
_kjdd_wfg_dump_cntrl0To control the way Wait-For_Graph is dumped
_kjltmaxgt1000record latch requests that takes longer than this many us
_kjltmaxht1000record latch reqeust that are held longer than this many us
_kjltonFALSEtrack DLM latch usage on/off
_kkfi_traceFALSEtrace expression substitution
_kkpap_zm_pruning_cacheTRUEcache result of recursive zonemap partition pruning query
_kkpogpi_nocpy1attempt to avoid partition metadata copy in kkpogpi
_kkpox_prtmv_rel_lock0explicitly release PRTMV heap during cursor compile
_kks_always_check_bind_equivalenceFALSECheck bind equivalence every time
_kks_cached_parse_errors0KKS cached parse errors
_kks_obsolete_dump_threshold1Number of parent cursor obsoletions before dumping cursor
_kks_parse_error_warning100Parse error warning
_kktAllowInsteadOfDDLTriggeronDDL0Oracle internal parameter to allow instead of DDL triggers on specified DDLs
_kokli_cache_size128Size limit of ADT Table Lookup Cache
_kokln_current_readFALSEMake all LOB reads for this session 'current' reads
_kolfuseslfFALSEallow kolf to use slffopen
_kqdsn_cpu_digits3number of cpu digits in scalable sequence
_kqdsn_instance_digits2number of instance digits in scalable sequence
_kql_clientlocks_enabled15clients allocating DLM memory
_kql_subheap_trace0tracing level for library cache subheap level pins
_kqr_enable_conservative_loggingTRUElog kgl/kqr objects conservativly in redo
_kqr_hot_copy_sample_size1000000number of mutex gets between periodic checks for hot objects
_kqr_hot_copy_sleep_limit500threshold of mutex sleeps to enable object hot copies
_kqr_max_hot_copies16upper limit of object hot copies allowed
_kqr_optimistic_readsTRUEoptimistic reading of row cache objects
_kra_cfile_compactionTRUEcontrolfile record compation
_kra_trace_buffer_size131072size of I/O trace buffer
_krb_check_osd_block_endianessTRUECheck OSD Block Endianess
_krb_trace_buffer_size131072size of per-process I/O trace buffer
_krbabr_trace_buffer_size131072size of I/O trace buffer
_krc_trace_buffer_size131072size of I/O trace buffer
_krpm_trace_buffer_size262144size of per-process mira trace buffer
_ksb_restart_clean_time30000process uptime for restarts
_ksb_restart_policy_times0, 60, 120, 240process restart policy times in seconds
_ksd_test_param999KSD test parmeter
_ksdx_charset_ratio0ratio between the system and oradebug character set
_ksdxdocmd_default_timeout_ms30000default timeout for internal oradebug commands
_ksdxdocmd_enabledTRUEif TRUE ksdxdocmd* invocations are enabled
_ksdxw_cini_flg0ksdxw context initialization flag
_ksdxw_nbufs1000ksdxw number of buffers in buffered mode
_ksdxw_num_pgw10number of watchpoints on a per-process basis
_ksdxw_num_sgw10number of watchpoints to be shared by all processes
_ksdxw_stack_depth4number of PCs to collect in the stack when watchpoint is hit
_ksdxw_stack_readableFALSEdump readable stack when watchpoint is hit
_kse_alt_stack_sig_syms25The number of top symbols used for the alternate stack signature
_kse_auto_coreFALSEgenerate core for unexpected SIGSEGV/SIGBUS
_kse_die_timeout60000amount of time a dying process is spared by PMON (in centi-secs)
_kse_pc_table_size256kse pc table cache size
_kse_signature_entries0number of entries in the kse stack signature cache
_kse_signature_limit7number of stack frames to cache per kse signature
_kse_snap_ring_disableFALSEset to TRUE or FALSE to disable or enable error logging
_kse_snap_ring_record_minminimize recorded information in error stack history
_kse_snap_ring_record_stackFALSEshould error snap ring entries show a short stack trace
_kse_snap_ring_size100ring buffer to debug internal error 17090
_kse_snap_ring_suppress942 1403List of error numbers to suppress in the snap error history
_kse_ssntFALSEdisables symbol translation in short stacks to make them faster
_kse_trace_int_msg_clearFALSEenables soft assert of KGECLEAERERROR is cleares an interrupt message
_ksfd_fob_pct0percentage of FOB state objects allocation
_ksfd_verify_writeFALSEverify asynchronous writes issued through ksfd
_ksfdx_testsksfdx testing - INTERNAL USE ONLY!
_ksfqp_row_count0row count of x$ksfqp
_ksgl_ltchs_held_ctxt8Average number of latches held per KSGL context
_ksgl_max_dyn_latches1024Maximum number of KSGL dynamic latches
_ksi_clientlocks_enabledTRUEif TRUE, DLM-clients can provide the lock memory
_ksi_pdb_checksTRUEif TRUE (default), do consistency checks on PDB IDs
_ksi_traceKSI trace string of lock type(s)
_ksi_trace_bucketSHAREDmemory tracing: use ksi-private or rdbms-shared bucket
_ksi_trace_bucket_sizeLCK1:1048576-REST:8192KSI trace bucket size in bytes (format: "LCK1:-REST:")
_ksim_time_monitorautoksim layer time dynamic monitor and statistics
_ksipc_aspc_enabledFALSEis KSIPC Address Space Support Enabled
_ksipc_cksum_levelConfigure IPC Checksum level for clients on a per transport basis
_ksipc_common_slConfigure a single SL value for all client/transport combinations
_ksipc_efchecks3Check HCA/OS version for Exafusion
_ksipc_group_sz1024Configure KSIPC group size
_ksipc_heap_extent1048576KSIPC Heap Extent Size
_ksipc_ipclw_cksum_enable0Configure IPCLW cksum
_ksipc_ipclw_conn_dump0Configure IPCLW connection dump rate
_ksipc_ipclw_enable_paramipclw parameter enablement
_ksipc_ipclw_library_pathover-ride default location of lib ipclw
_ksipc_ipclw_rcvbuf_mb0Configure IPCLW RCVBUF SIZE (in MB)
_ksipc_ipclw_spare_param2ksipc ipclw spare parameter 2
_ksipc_ipclw_spare_param3ksipc ipclw spare parameter 3
_ksipc_ipclw_spare_param4ksipc ipclw spare parameter 4
_ksipc_ipclw_spare_param5ksipc ipclw spare parameter 5
_ksipc_ipclw_spare_param6ksipc ipclw spare parameter 6
_ksipc_ipclw_spare_param7ksipc ipclw spare parameter 7
_ksipc_ipclw_spare_param8ksipc ipclw spare parameter 8
_ksipc_libipc_pathover-ride default location of libipc
_ksipc_loopback_ipsKSIPC Loopback IP addresses
_ksipc_mga_segment_size268435456KSIPC MGA Segment Size
_ksipc_mode0ksipc mode
_ksipc_netintr_timeoutipq.KSMSQ_UDP_TRANS=30Specify the timeout for queueing network interrupt to a processon a per transport basis
_ksipc_service_levelConfigure service level for clients on a per transport basis
_ksipc_service_mask1KSIPC Service Mask
_ksipc_skgxp_compat_library_pathover-ride default location of lib skgxp compat
_ksipc_skgxp_library_pathover-ride default location of lib skgxp
_ksipc_spare_param10ksipc spare param 1
_ksipc_spare_param30ksipc spare param 3
_ksipc_spare_param40ksipc spare param 4
_ksipc_spare_param50ksipc spare param 5
_ksipc_trace_bucketPRIVATEmemory tracing: use ksipc-private or rdbms-shared bucket
_ksipc_trace_bucket_sizeIPC0:1048576-REST:8192KSIPC trace bucket size in bytes (format: "IPC0:-REST:")
_ksipc_wait_flags0tune ksipcwait
_ksipc_window_sizeConfigure IPC Windowing Value for clients on a per transport basis
_ksipcsnsrvConfigure Shared Nothing Server Name
_ksm_post_sga_init_notif_delay_secs0seconds to delay instance startup at sga initialization (post)
_ksm_pre_sga_init_notif_delay_secs0seconds to delay instance startup at sga initialization (pre)
_ksm_shared_pool_stats_minsz524288min value for printing stats
_ksm_shared_pool_stats_num_pdb8number of pdbs to dump shared pool info for
_ksm_sp_rcr_hits10hits to make object recurrent
_ksmb_debug0ksmb debug flags
_ksmd_protect_modeoffKSMD protect mode for catching stale access
_ksmd_trace0ksmd tracing
_ksmg_granule_size16777216granule size in bytes
_ksmlsaf0KSM log alloc and free
_ksmsq_conn_per_epoch0KSMSQ Connections Per Epoch
_ksmsq_hintmaxinst1024KSMSQ Hint Max Instances
_ksmsq_hintmaxproc320KSMSQ Hint Max Processes
_kspmx_enabledFALSEKSPMX Is Enabled
_kspmxs_flush_cache_size1KSPMXS flush cache size
_kspmxs_latch_freelists2Number of managed PMEM latch freelists
_kspmxs_latch_usid_map_size256KSPMXS latch usid map size
_kspmxs_max_regions64KSPMXS max regions
_kspmxs_max_waits4KSPMXS max waits
_kspmxs_txn_freelists32Number of PMEM transactions freelists
_kspmxs_upgrade_mutexes64KSPMXS upgrade mutex
_kspmxs_usid_map_size1024KSPMXS usid map size
_kspmxs_wait_buckets1024KSPMXS wait buckets
_kspol_tac_timeout5timeouts for TAC registerd by kspol
_ksr_control_dyn_flags0KSR dyanamic control flags
_ksr_control_flags0KSR control flags
_ksr_unit_test_processes0number of ksr unit test processes
_ksrma_enabledAUTOturn ksrma off, make it automatic, or turn on CMI or KSMSQ provider. Default is off
_ksrma_gsm_base_addrBase Address to use for GSM
_kss_callstack_typestate object callstack trace type
_kss_quietTRUEif TRUE access violations during kss dumps are not recorded
_ksu_diag_kill_time5number of seconds ksuitm waits before killing diag
_ksu_proc_percent_target50dynamic process usage target
_ksu_proc_percent_threshold70dynamic process usage threshold
_ksuitm_addon_trccmdcommand to execute when dead processes don't go away
_ksuitm_dont_kill_dumperFALSEdelay inst. termination to allow processes to dump
_ksv_dynamic_flags10ksv dynamic flags 1 - override default behavior
_ksv_max_spawn_fail_limit5bg slave spawn failure limit
_ksv_pool_hang_kill_to0bg slave pool terminate timeout
_ksv_pool_wait_timeout600bg slave pool wait limit
_ksv_slave_exit_timeout120slave exit timeout
_ksv_spawn_control_allFALSEcontrol all spawning of background slaves
_ksv_static_flags10ksv static flags 1 - override default behavior
_ksvppktmode0ksv internal pkt test
_ksws_alb_block_serviceFALSEenable ALB Blocking of overloaded service
_ksws_alb_session_age120KSWS ALB Minimum age(seconds) of session to consider marking
_ksws_alb_test_delta_override0KSWS ALB total sessions after which service is blocked
_ksws_alb_test_drain_timeout300KSWS ALB time in seconds before draining kicks in
_ksws_alb_test_load_balance_frequency300KSWS ALB Load Balance Frequency in deci seconds
_ksws_alb_test_load_percent106KSWS ALB Load Percentage to trigger marking for draining
_ksws_alb_test_selection_bias100KSWS ALB percentage of sessions to target
_ksws_enable_albTRUEenable ALB metrics processing
_ksws_fallback_to_rootFALSEKSWS Fallback to Root CDB service
_ksws_goodness_control1KSWS Goodness Control to Manually override
_ksws_java_patching0java patching mode
_ksws_modsvc_call_out_enabledFALSEmodify service call out enabled
_ksws_rlb_cpu_busy_scopeTRUEKSWS RLB CPU BUSY SCOPE
_ksws_use_placement_template_attributeFALSEuse placement_template attribute
_kswsas_close_pdb_on_lstsvcTRUEClose a PDB when the last user service is stopped
_kswsas_db_svc_mappingMap db service name to different service
_kswsas_drain_kill_batch_size5Batch size for killing non-drained sessions
_kswsas_ht_log_size7kswsas_ht_log_size
_kswsas_num_jp_slaves0Number of slaves for java patching
_kswsas_pdb_auto_close_timeout600Close a PDB after the timeout
_ksxp_compat_flags0ksxp compat flags
_ksxp_control_flags0modify ksxp behavior
_ksxp_diagmodeOFFset to OFF to disable automatic slowsend diagnostics
_ksxp_disable_clss0disable CLSS interconnects
_ksxp_disable_dynamic_loadingFALSEdisable dynamic loadin of lib skgxp
_ksxp_disable_ipc_statsFALSEdisable ipc statistics
_ksxp_disable_rolling_migrationFALSEdisable possibility of starting rolling migration
_ksxp_dump_timeout20set timeout for kjzddmp request
_ksxp_dynamic_skgxp_paramdynamic skgxp parameters
_ksxp_exa_ip_config0ksxp exa ip config
_ksxp_if_config0ksxp if config flags
_ksxp_init_stats_bkts0initial number arrays for ipc statistics
_ksxp_ipclw_enabled1enable ipclw for KSXP
_ksxp_ipclw_ptswinsz8KSXP port conn send window
_ksxp_ksmsq_ip_config0ksxp ksmsq ip config
_ksxp_lw_post_flags0tune ksxp post (lw)
_ksxp_max_stats_bkts0max. arrays for ipc statistics
_ksxp_ping_enableTRUEdisable dynamic loadin of lib skgxp
_ksxp_ping_polling_time0max. arrays for ipc statistics
_ksxp_poll_netintr_timeout3600ksxp poll network interrupt timeout in seconds
_ksxp_reaping50tune ksxp layer reaping limit
_ksxp_reporting_processLMD0reporting process for KSXP
_ksxp_save_sockets0Limit foreground process's sockets
_ksxp_save_sockets_pattern*Process pattern on which sockets saving is active
_ksxp_send_timeout300set timeout for sends queued with the inter-instance IPC
_ksxp_skgxp_ant_optionsSKGXP ANT options
_ksxp_skgxp_ctx_flags10IPC debug options flags (RAC)
_ksxp_skgxp_ctx_flags1mask0IPC debug options flags mask (RAC)
_ksxp_skgxp_dynamic_protocol4096IPC protocol override (RAC) (0/-1=*,2=UDP,3=RDS,!0x1000=ipc_X)
_ksxp_skgxp_inetslimit SKGXP networks
_ksxp_skgxp_rgn_ports0region socket limits (0xFFFFNNXX): F=flags, N=min, X=max
_ksxp_skgxp_spare_param1ipc ksxp spare parameter 1
_ksxp_skgxp_spare_param2ipc ksxp spare parameter 2
_ksxp_skgxp_spare_param3ipc ksxp spare parameter 3
_ksxp_skgxpg_last_parameter27last defined skgxpg parameter - ksxp
_ksxp_spare_param1KSXP Spare Parameter 1
_ksxp_stats_mem_lmt0limit ipc statistics memory. this parameter is a percentage value
_ksxp_testing0KSXP test parameter
_ksxp_unit_test_byte_transformationFALSEenable byte transformation unit test
_ksxp_validate_cnh_life_cycle0enable validation of ksxp connection life cycle
_ksxp_wait_flags0tune ksxpwait
_ksxp_xrc_cm_portoverride XRC CM port
_ksz_dummy_parameterInternal spare parameter for ksz.c
_ksz_dummy_parameter2Internal spare parameter2 for ksz.c
_ktb_debug_flags8ktb-layer debug flags
_ktc_debug0for ktc debug
_ktc_latches0number of ktc latches
_ktilm_uga_offFALSEDisable KTILM UGA cache activity tracking
_ktilmsc_exp600expiration time of ktilm segment cache (in second)
_ktslj_segext_max_mb0segment pre-extension max size in MB (0: unlimited)
_ktslj_segext_retry5segment pre-extension retry
_ktslj_segext_warning10segment pre-extension warning threshold in percentage
_ktslj_segext_warning_mb0segment pre-extension warning threshold in MB
_ktspsrch_maxsc1024maximum segments supported by space search cache
_ktspsrch_maxskip5space search cache rejection skip upper limit
_ktspsrch_scchk60cleanout check time of space search cache
_ktspsrch_scexp60expiration time of space search cache
_ktst_rss_max1000maximum temp extents to be released across instance
_ktst_rss_min100minimum temp extents to be released across instance
_ktst_rss_retry5maximum retries of sort segment release
_ktt_tsid_reuse_threshold60000tablespace id reuse threshold
_ktte_ts_shrink_group6tablespace shrink group
_ktte_ts_shrink_interval3600tablespace shrink interval
_kttext_warning1285tablespace pre-extension and shrink warning threshold in percentage
_ktu_latches0number of KTU latches
_ku_tracenonedatapump trace parameter
_kxdbio_ctx_init_count32initial count of KXDBIO state object
_kxdbio_disable_offload_opcode0KXDBIO Disable offload for the set opcodes. Value is a Bitmap of 0x00000001 - disable cell to cell data copy offload 0x00000002 - disable disk scrubbing offload to cell 0x00000004 - disable offloaded writes to cell
_kxdbio_enable_ds_opcode0KXDBIO Enable Dumb storage simulation for the set opcodes.
_kxdbio_hca_loadavg_thresh74HCA loadavg threshold at which writes need to get offloaded
_kxdbio_offena_timeout7200000kxdbio re-enable offloaded write timeout
_kxdbio_ut_ctl0kxdbio unit test controls
_kxscio_cap_stacksFALSEcapture location when kxscio is set to null
_large_pool_min_alloc65536minimum allocation size in bytes for the large allocation pool
_last_allocation_period5period over which an instance can retain an active level1 bitmap
_latch_class_0latch class 0
_latch_class_1latch class 1
_latch_class_2latch class 2
_latch_class_3latch class 3
_latch_class_4latch class 4
_latch_class_5latch class 5
_latch_class_6latch class 6
_latch_class_7latch class 7
_latch_classeslatch classes override
_latch_miss_stat_sid0Sid of process for which to collect latch stats
_latch_pause_count0Latch pause count
_latch_pause_modestaticLatch pause mode
_latch_wait_list_pri_sleep_secs1Time to sleep on latch wait list until getting priority
_ldap_adaptive_to_no_nested_group_searchTRUELDAP adaptive to no nested group search
_ldap_config_force_sync_upFALSELDAP configure force sync up
_ldap_config_ssl_for_sasl_md5TRUELDAP configure SSL for SASL-DIGEST-MD5
_ldap_no_nested_group_searchFALSELDAP no nested group search
_ldap_password_oneway_authFALSEUse oneway auth for password based LDAP directory bind
_ldap_reset_user_account_flcTRUELDAP reset user account lockout counter
_ldap_use_all_direct_groups_onlyTRUELDAP use all direct groups only
_ldap_warning_on_multi_shared_mappingsFALSELDAP warning on multiple shared mappings
_ldr_io_size1048576size of write IOs used during a load operation
_ldr_pga_lim0pga limit, beyond which new partition loads are delayed
_ldr_tempseg_threshold8388608amount to buffer prior to allocating temp segment (extent sizing)
_left_nested_loops_randomTRUEenable random distribution method for left of nestedloops
_lgwr_delay_writeFALSELGWR write delay for debugging
_lgwr_io_outlier0LGWR I/O outlier frequency
_lgwr_io_slaves0LGWR I/O slaves
_lgwr_max_ns_wt1Maximum wait time for lgwr to allow NetServer to progress
_lgwr_ns_nl_max1000Variable to simulate network latency or buffer threshold
_lgwr_ns_nl_min500Variable to simulate network latency or buffer threshold
_lgwr_ns_sim_err0Variable to simulate errors lgwrns
_lgwr_posts_for_pending_bcastsFALSELGWR posts commit waiters for pending broadcasts
_lgwr_ta_sim_err0Variable to simulate errors lgwr true async
_library_cache_adviceTRUEwhether KGL advice should be turned on
_library_cache_dump_cooling_period10Period to wait (in minutes) before resetting dump count
_library_cache_dump_interval0Interval (in seconds) between each dump
_light_work_rule_debugFALSEif TRUE, light work rule debugging is enabled
_lightweight_hdrsTRUELightweight headers for redo
_like_with_bind_as_equalityFALSEtreat LIKE predicate with bind as an equality predicate
_limit_itls20limit the number of ITLs in OLTP Compressed Tables
_link_ts_force_onlineTRUEforce linked tablespace to be online
_link_ts_nameName of linked tablespace
_listener_registration_retry_secs60listener registration retry time (in seconds)
_lm_activate_lms_threshold100threshold value to activate an additional lms
_lm_adrm_interval300active drm interval in centiseconds
_lm_adrm_options3active drm options
_lm_adrm_scan_timeout50active drm f2a/flush scan timeout in centisecs
_lm_adrm_time_out120active drm timeout in minutes
_lm_asm_enq_hashingTRUEif TRUE makes ASM use enqueue master hashing for fusion locks
_lm_async_daFALSEenable async da requests
_lm_batch_compression_threshold0GES threshold to start compression on batch messages
_lm_better_ddvictimTRUEGES better deadlock victim
_lm_big_cluster_optimizationsTRUEenable certain big cluster optimizations in drm
_lm_broadcast_resenable_broadcastEnable broadcast of highest held mode of resource.
_lm_cache_allocated_res_ratio50ratio of cached over allocated resources
_lm_cache_enqueuestring of enqueues to cache at the client: separate by
_lm_cache_lvl0_cleanup0how often to cleanup level 0 cache res (in sec)
_lm_cache_res_cleanup25percentage of cached resources should be cleanup
_lm_cache_res_cleanup_tries10max number of batches of cached resources to free per cleanup
_lm_cache_res_options0ges resource cache options
_lm_cache_res_skip_cleanup20multiple of iniital res cache below which cleanup is skipped
_lm_cache_res_typeTMHWHVDIcache resource: string of lock types(s)
_lm_check_ges_resource0GES: additional checks during resource allocation (0
_lm_checksum_batch_msg0GES checksum batch messages
_lm_chk_inv_domenq_opsTRUEenable checks for invalid enqueue operations on domains
_lm_comm_channelmsgqGES communication channel type
_lm_comm_msgq_bufr_multiple8MSGQ_DRMQ multiple for maximum buffers
_lm_comm_msgq_busywait0busy wait time in microsecond for msgq
_lm_comm_msgq_copy_buffersFALSEMSGQ_DRMQ copy msgs to new buffer
_lm_comm_msgq_fixed_buffersFALSEMSGQ with fixed number of receive buffers
_lm_comm_rcv_msg_history_slots50GES communication receive message history slots
_lm_comm_reap_count1message reap count for receive
_lm_comm_send_proxy_nr_delay10Send proxy delay before sending NULLREQ
_lm_comm_send_proxy_tkt_returnTRUEAllow send proxy to return tickets
_lm_comm_slow_op_loop_threshold15GES communication slow operation loop threshold in ms
_lm_comm_slow_op_spx_loop_threshold30000GES comm slow spx operation loop threshold in microsec
_lm_comm_slow_op_stat_dump_threshold5GES communication slow operation stat dump threshold in sec
_lm_comm_sync_seq_on_send_failureTRUEGES communication sync seq for failed sends after reconfig
_lm_comm_tkts_adaptiveTRUEAdpative ticketing enabled
_lm_comm_tkts_adpt_rsv1Adpative ticketing reserve multiple
_lm_comm_tkts_calc_period_length100000Weighted average calculation interval length (us)
_lm_comm_tkts_max_add5Ticket allocation maximum allotments
_lm_comm_tkts_max_periods10Max number of periods used in weighted avearage calculation
_lm_comm_tkts_min_decrease_wait120Seconds to wait before allowing an allocation decrease
_lm_comm_tkts_min_increase_wait10Seconds to wait before allowing an allocation increase
_lm_comm_tkts_mult_factor1Ticket allocation multiplication factor
_lm_comm_tkts_nullreq_threshold1Null request threshold
_lm_comm_tkts_sub_factor10Ticket allocation subtraction factor
_lm_compression_schemezlibGES compression scheme
_lm_contiguous_res_count128number of contiguous blocks that will hash to the same HV bucket
_lm_da_win_enableTRUEenable da windowing
_lm_da_window1number of windows in domain action
_lm_da_window_interval0Interval in centiseconds between each domain action window
_lm_db_rank6rank of this DB for process priority purposes
_lm_db_ranksranks of DBs on this node
_lm_dd_ignore_noddFALSEif TRUE nodeadlockwait/nodeadlockblock options are ignored
_lm_dd_interval10dd time interval in seconds
_lm_dd_max_search_time180max dd search time per token
_lm_dd_maxdump50max number of locks to be dumped during dd validation
_lm_dd_scan_interval5dd scan interval in seconds
_lm_dd_search_cnt3number of dd search per token get
_lm_default_failure_action0default failure action
_lm_deferred_msg_timeout163deferred message timeout
_lm_domain_hash_buckets64number of buckets for the domains hash table
_lm_drm_banned_objslist of objects not allowed to do drm
_lm_drm_batch_time10time in seconds to wait to batch drm requests
_lm_drm_disable0disable drm in different level
_lm_drm_disable_kjfcFALSEdisable drm at kjfc level
_lm_drm_duration_limitset drm object duration limit (secs time/object size)
_lm_drm_duration_limit_type2drm object time limit type (time/size)
_lm_drm_filter_history_windowdrm filter history window
_lm_drm_filter_history_window_type2drm object time limit type (time/size)
_lm_drm_filters3enable drm filters
_lm_drm_hiload_percentage200drm high load threshold percentage
_lm_drm_lowload_percentage200drm low load threshold percentage
_lm_drm_max_banned_objs235maximum number of objects not allowed to do drm
_lm_drm_max_requests100dynamic remastering maximum affinity requests processed together
_lm_drm_min_interval600minimum interval in secs between two consecutive drms
_lm_drm_object_scanTRUEenable/disable object scan to force full table scan always
_lm_drm_we_interval60drm wait events collection interval in seconds
_lm_drm_we_size2000size of drm wait events statistics
_lm_drm_window0dynamic remastering bucket window size
_lm_drm_xlatch0dynamic remastering forced exclusive latches
_lm_drmopt1256enable drm scan optimizations in 12
_lm_dump_null_lockFALSEdump null lock in state dump
_lm_dynamic_lmsFALSEdynamic lms invocation
_lm_dynamic_loadTRUEdynamic load adjustment
_lm_dynamic_sga_targetdynamically adjust for changes in SGA size
_lm_enable_aff_benefit_statsFALSEenables affinity benefit computations if TRUE
_lm_enable_pdb_abort0enable pdb abort as default failure action
_lm_enable_translationFALSEtells if KJURN_PDBID should translate using kpdb calls
_lm_enq_iso_enabledTRUEif TRUE enables enqueue isolation
_lm_enq_lock_freelistNumber of ges enqueue element freelist
_lm_enq_rcfgTRUEif TRUE enables enqueue reconfiguration
_lm_enqueue_blocker_dump_timeout120enqueue blocker dump timeout
_lm_enqueue_blocker_dump_timeout_cnt30enqueue blocker dump timeout count
_lm_enqueue_blocker_kill_timeout0enqueue blocker kill timeout
_lm_enqueue_freelist3Number of enqueue freelist
_lm_enqueue_timeout360enqueue suggested min timeout in seconds
_lm_exadata_fence_typeTRUEif FALSE disable Exadata fence type
_lm_fdrm_statsFALSEgather full drm statistics
_lm_file_affinitymapping between file id and master instance number
_lm_file_read_mostlymapping between read-mostly file id and master instance number
_lm_free_queue_threshold0GES free queue threshold
_lm_freeze_kill_time30timeout for killing unfrozen processes in rcfg/drm freeze step
_lm_gcs_rht_alloc_size4096gcs rht allocation chunk size
_lm_ges_rht_alloc_size4096ges rht allocation chunk size
_lm_ges_rht_mem_pct15options to size RHT structures per pdb
_lm_gl_hash_scheme1group lock table hashing scheme (0
_lm_global_postsTRUEif TRUE deliver global posts to remote nodes
_lm_hash_control5bit field controlling the hashing behavior of the lock manager
_lm_hashtable_bkt_high5High element threshold in hash table bucket
_lm_hashtable_bkt_low3Low element threshold in hash table bucket
_lm_hashtable_bkt_thr70Threshold for hash table resizing
_lm_hb_acceptable_hang_conditiondefaultlist of acceptable hang conditions in heartbeat check
_lm_hb_callstack_collect_time5hb diagnostic call stack collection time in seconds
_lm_hb_callstack_collect_time_long60extended hb diagnostic call stack collection time in seconds
_lm_hb_cfio_timeout70control file io timeout in seconds
_lm_hb_disable_check_listARC*list of process names to be disabled in heartbeat check
_lm_hb_enable_acl_checkTRUEto enable the wait analysis with acceptable condition lists
_lm_hb_exponential_hang_time_factor2heartbeat exponential hang time multiplier
_lm_hb_lgio_timeout70LGWR io timeout in seconds
_lm_hb_maximum_hang_report_count20maximum heartbeat hang report count
_lm_hb_per_proc_behaviordefaultheartbeat behavior
_lm_hb_per_proc_timeoutdefaultheartbeat timeout
_lm_hb_timeout_extensionheartbeat timeout extension in seconds
_lm_high_load_sysload_percentage90high watermark system load percentage
_lm_high_load_threshold5high load threshold parameter
_lm_hwc_disabledFALSEto disable handle with care behavior
_lm_idle_connection_actionkillGES idle connection action
_lm_idle_connection_checkTRUEGES idle connection check
_lm_idle_connection_check_interval140GES idle connection check interval time
_lm_idle_connection_instance_check_calloutTRUEGES idle connection instance check callout
_lm_idle_connection_killTRUEGES idle connection kill
_lm_idle_connection_kill_max_skips1GES idle connection max skip kill request
_lm_idle_connection_load_checkTRUEGES idle connection load check
_lm_idle_connection_max_ignore_kill_count2GES maximum idle connection kill request ignore count
_lm_idle_connection_quorum_threshold50GES idle connection health quorum threshold
_lm_inherited_max_requests100maximum inherited affinity dissolve requests processed together
_lm_kill_fg_on_timeoutTRUEGES kill fg on IPC timeout
_lm_lazy_domain_timeout600lazy domain timeout in seconds
_lm_lazy_recovery_member_timeout300lazy recovery member detach timeout in seconds
_lm_lhupd_interval5load and health update interval
_lm_lmd_waittime8default wait time for lmd in centiseconds
_lm_lmon_nowait_latchTRUEif TRUE makes lmon get nowait latches with timeout loop
_lm_lms0number of background gcs server processes to start
_lm_lms_no_yieldFALSEif TRUE, LMS will not yield in spin mode
_lm_lms_opt_priorityTRUEenable freeslot lms priority optimization
_lm_lms_priority_check_frequency60000frequency of LMS priority decisions in milliseconds
_lm_lms_priority_dynamicTRUEenable lms priority modification
_lm_lms_rt_thresholdmaximum number of real time lms processes on machine
_lm_lms_spinFALSEmake lms not sleep
_lm_lms_waittime3default wait time for lms in centiseconds
_lm_local_hp_enqTRUEuse static file affinity for HP enqueue mastership
_lm_locks12000number of enqueues configured for cluster database
_lm_low_load_percentage75low watermark percentage for load threshold
_lm_master_weight1master resource weight for this instance
_lm_max_lms0max. number of background global cache server processes
_lm_max_lms_block_time5max blocking time allowed on LMS (sec)
_lm_mp_additional_big_buffers20GES MP extra big buffers per pool
_lm_mp_additional_reg_buffers20GES MP extra regular buffers per pool
_lm_mp_avail_queue_threshold0GES MP avail queue threshold
_lm_mp_bulk_mbuf_freeFALSEGES MP bulk free message buffer queues
_lm_mp_expand_big_pool_percent1GES MP expand big pool
_lm_mp_expand_reg_pool_percent5GES MP expand regular pool
_lm_mp_latch_trigger4000GES MP Latch trigger threshold for trace lines
_lm_mp_latch_trigger_soft40000GES MP Latch trigger threshold for soft assert
_lm_mp_share_lms_poolsTRUEGES MP share LMS pools with critical BGs
_lm_mp_small_lms_poolsTRUEGES MP small regular pool for LMS when not sharing
_lm_msg_batch_size0GES batch message size
_lm_msg_cleanup_interval3000GES message buffer cleanup interval time
_lm_msg_pool_dump_threshold20000GES message pool dump threshold in terms of buffer count
_lm_msg_pool_user_callstack_dumpFALSEGES message pool call stack dump upon exceeding of threshold
_lm_new_esm1use new enter server mode code
_lm_no_lh_checkFALSEskip load and health check at decision points
_lm_no_syncTRUEskip reconfiguration/drm syncr/synca messaging
_lm_node_join_optFALSEcluster database node join optimization in reconfig
_lm_non_fault_tolerantFALSEdisable cluster database fault-tolerance mode
_lm_nonisolated_restypeTOTTULstring of resource types banned from enqueue isolation
_lm_num_bnft_stats_buckets1number of buckets in the benefit stats hash table
_lm_num_msg_pools_per_type1number of GES message pools per type
_lm_num_pt_buckets8192number of buckets in the object affinity hash table
_lm_num_pt_latches128number of latches in the object affinity hash table
_lm_omni_ack_timeout60Max time to wait for omni acks before triggering netcheck in secs
_lm_optmode_switch0GES: Optmode switching for enqueues (none, manual, stats-driven)
_lm_pdb_domains_enable7enable pdb domains in DLM
_lm_pdb_wait_all_goneFALSEpdb domain attach wait until all locks are gone
_lm_pdb_weight_opts27options to size RHT structures per pdb
_lm_postevent_buffer_size256postevent buffer size
_lm_preregister_css_restypeCFenqueue type that requires pre-registration to css
_lm_proc_freeze_timeout70reconfiguration: process freeze timeout
_lm_process_batchingTRUEGES implicit process batching for IPC messages
_lm_process_lock_q_scan_limit100limit on scanning process lock queue instead of resource convert lock queue
_lm_procs1088number of client processes configured for cluster database
_lm_psrcfgTRUEenable pseudo reconfiguration
_lm_rac_spare_dp10rac parameter dp1
_lm_rac_spare_dp10rac parameter dp10
_lm_rac_spare_dp20rac parameter dp2
_lm_rac_spare_dp30rac parameter dp3
_lm_rac_spare_dp40rac parameter dp4
_lm_rac_spare_dp50rac parameter dp5
_lm_rac_spare_dp6rac parameter dp6
_lm_rac_spare_dp7rac parameter dp7
_lm_rac_spare_dp8rac parameter dp8
_lm_rac_spare_dp9rac parameter dp9
_lm_rac_spare_p10rac parameter p1
_lm_rac_spare_p10rac parameter p10
_lm_rac_spare_p110rac parameter p11
_lm_rac_spare_p120rac parameter p12
_lm_rac_spare_p130rac parameter p13
_lm_rac_spare_p14rac parameter p14
_lm_rac_spare_p15rac parameter p15
_lm_rac_spare_p16rac parameter p16
_lm_rac_spare_p20rac parameter p2
_lm_rac_spare_p30rac parameter p3
_lm_rac_spare_p40rac parameter p4
_lm_rac_spare_p50rac parameter p5
_lm_rac_spare_p6rac parameter p6
_lm_rac_spare_p7rac parameter p7
_lm_rac_spare_p8rac parameter p8
_lm_rac_spare_p9rac parameter p9
_lm_rcfg_kjcdump_time60dlm reconfiguration communication dump interval
_lm_rcfg_timeout489dlm reconfiguration timeout
_lm_rcvinstTRUEinstance inheritance
_lm_rcvinst_atp_optTRUErecovery instance optimization for ATP
_lm_rcvinst_sga_threshold85recovery buddy SGA threshold
_lm_rcvr_hang_allow_time70receiver hang allow time in seconds
_lm_rcvr_hang_cfio_killFALSEto kill receiver hang at control file IO
_lm_rcvr_hang_check_frequency20receiver hang check frequency in seconds
_lm_rcvr_hang_check_system_loadTRUEexamine system load when check receiver health
_lm_rcvr_hang_killTRUEto kill receiver hang
_lm_rcvr_hang_systemstate_dump_level0systemstate dump level upon receiver hang
_lm_receiver_type0receiver thread type performing receive function
_lm_recovery_pdbw_reduction4recovery member pdbw reduction
_lm_recovery_set1enable recovery set checking for accessing invalid domains
_lm_reloc_use_mhintFALSEif TRUE, AR-/AH-enqueues use mastering hints
_lm_res_hash_bucket0number of resource hash buckets
_lm_res_part128number of resource partition configured for gcs
_lm_res_tm_hash_bucket0number of extra TM resource hash buckets
_lm_resend_open_convert_timeout30timeout in secs before resubmitting the open-convert
_lm_resource_recycle_cnt32GES: number of resources to recycle optimization
_lm_ress6000number of resources configured for cluster database
_lm_rm_object_bypassTRUEenable read-mostly object bypass for HARIM
_lm_rm_slaves1number of remastering slaves
_lm_send_modeautoGES send mode
_lm_send_queue_batchingTRUEGES send queue message batching
_lm_send_queue_length5000GES send queue maximum length
_lm_sendproxy_reserve25GES percentage of send proxy reserve of send tickets
_lm_share_lock_optTRUEif TRUE enables share lock optimization
_lm_share_lock_pdbisolationTRUEif TRUE enables share lock optimization with pdb isolation
_lm_share_lock_restypestring of enqueue resource types eligible for S-optimisation
_lm_single_inst_affinity_lockFALSEenable single instance affinity lock optimization
_lm_singleton_pdb_optTRUERAC PDB singleton optimization
_lm_sndq_flush_int5send queue flush time interval (ms)
_lm_sp_slave_mode0sendproxy slave operation mode
_lm_sp_slaves0number of sendproxy slaves
_lm_spare_threads0number of spare threads to be created by the GPnP master
_lm_spare_undo0number of spare undo tablespaces to be created by GPnP master
_lm_sq_batch_factor2GES send queue minimum batching factor
_lm_sq_batch_typeautoGES send queue batching mechanism
_lm_sq_batch_waittick3GES send queue batching waittime in tick
_lm_sync_timeout163Synchronization timeout for DLM reconfiguration steps
_lm_throttle_time_interval60GES message throttle interval time in sec
_lm_ticket_active_sendback50Flow control ticket active sendback threshold
_lm_ticket_check_injectFALSEInject tickets when flow control tkt leak discoverd
_lm_ticket_low_limit_warning10lowest number of avail tickets percentage threshold warning
_lm_ticket_min50GES messaging tickets per instance minimum
_lm_tickets1000GES messaging tickets
_lm_timed_statistics_level0if non zero, it enables timed statistics on lmd and lms
_lm_tkt_leak_check_count5Consecutive low NULLACKs to trigger leak check
_lm_tkt_leak_check_seconds300Duration of leak check in seconds
_lm_tx_delta16TX lock localization delta
_lm_uid_default_lookup_valueTRUEreturns the default value for uid to id translation
_lm_use_gcrTRUEuse GCR module if TRUE
_lm_use_new_defmsgtmo_actionTRUEuse new defered msg queue timeout action
_lm_use_tx_tsnTRUEuse undo tsn affinity master as TX enqueue master
_lm_use_us_timerFALSEUse microsecond timer for LM hist
_lm_validate_pbatchFALSEGES process batch validation
_lm_wait_for_hub_rcv_timeout300000read-only insts wait for hub avaliable to recover in millis
_lm_wait_pending_send_queueTRUEGES wait on pending send queue
_lm_watchpoint_kjmddplist of kjmddp fields for memory watchpoint
_lm_watchpoint_maximum3GES number of watchpoints
_lm_watchpoint_timeout3600GES maximum time in seconds to keep watchpoint
_lm_wrkr_mode0LMS worker thread mode
_lm_wrkr_slaves0number of LMS worker slaves
_lm_xids1196number of transaction IDs configured for cluster database
_lmhb_max_dynamic_hb10max number of proc heartbeats that can be dynamically monitored
_lmhb_procstate_dump_cputime_limit60hb diagnostic cputime limit for process state dump in secs
_lmhb_procstate_dump_runtime_limit60hb diagnostic runtime limit for process state dump in secs
_lmn_invalidlkr_enabledTRUEsuppl logging for invalid lkr enabled
_lms_rollbacks1000Maximum number of CR rollbacks per block under LMS
_load_without_compilenoneLoad PL/SQL or Database objects without compilation
_lob_use_locator_varying_widthFALSEuse varying width flag in lob locator
_local_arc_assert_on_waitFALSEAssert whenever local ORL arch waits for space
_local_communication_costing_enabledTRUEenable local communication costing when TRUE
_local_communication_ratio50set the ratio between global and local communication (0..100)
_local_hang_analysis_interval_secs3the interval at which local hang analysis is run
_lock_dc_users_time120max time to attempt to lock dc_users
_lock_next_constraint_count3max number of attempts to lock _NEXT_CONSTRAINT
_lock_ref_constraint_count50number of nowait attempts to lock referential constraint
_lock_ref_descendants_count50number of nowait attempts to lock ref-partitioning descendants
_log_archive_buffers10Number of buffers to allocate for archiving
_log_archive_network_redo_size10Log archive network redo buffer size used by ARCH
_log_archive_prot_auto_demoteFALSElog archive protection auto demotion
_log_archive_strong_authTRUElog archive security strong auth
_log_archive_trace_pidslog archive trace pids parameter
_log_blocks_during_backupTRUElog block images when changed during backup
_log_buffer_coalesceFALSECoalescing log buffers for log writes
_log_buffers_corruptFALSEcorrupt redo buffers before write
_log_buffers_debugFALSEdebug redo buffers (slows things down)
_log_checkpoint_recovery_check0# redo blocks to verify after checkpoint
_log_committime_block_cleanoutFALSELog commit-time block cleanout
_log_deletion_policymandatoryarchivelog deletion policy for mandatory/all destination
_log_file_sync_timeout10Log file sync timeout (centiseconds)
_log_max_optimize_threads128maximum number of threads to which log scan optimization is applied
_log_parallelism_dynamicTRUEEnable dynamic strands
_log_parallelism_max2Maximum number of log buffer strands
_log_private_mul5Private strand multiplier for log space preallocation
_log_private_parallelism_mul10Active sessions multiplier to deduce number of private strands
_log_read_buffer_size8buffer size for reading log files
_log_read_buffers8Number of log read buffers for media recovery
_log_segment_dump_parameterTRUEDump KSP on Log Segmentation
_log_segment_dump_patchTRUEDump Patchinfo on Log Segmentation
_log_silicon_secured_memoryTRUEenable silicon secured memory (log)
_log_simultaneous_copies8number of simultaneous copies into redo buffer(# of copy latches)
_log_space_errorsTRUEshould we report space errors to alert log
_log_switch_timeout0Maximum number of seconds redos in the current log could span
_log_switch_tracing_iterations5no. of iterations to trace after logswitch timeout
_log_switch_tracing_timeout200dbwr to trace after logswitch timeout in secs
_log_write_info_size4096Size of log write info array
_log_write_worker_post_spinwait0How long log write workers spin wait before posting FGs
_log_write_worker_task_prefetchEARLYLog write worker prefetches tasks
_log_write_worker_task_spinwait0How long log write workers spin wait for imminent tasks
_log_writer_worker_dlm_hearbeat_update_freq5000LGWR worker DLM health-monitoring heartbeat update frequency (ms)
_logminer_parallel_readTRUELogMiner parallel read
_logout_storm_rate0number of processes that can logout in a second
_logout_storm_retrycnt600maximum retry count for logouts
_logout_storm_timeout5timeout in centi-seconds for time to wait between retries
_long_bcast_ack_warning_threshold500threshold for long bcast ack warning messages in ms
_long_log_write_warning_threshold500threshold for long log write warning messages in ms
_longops_enabledTRUElongops stats enabled
_longops_per_latch64number of longops to allocate per latch
_lost_write_parallelism_change_tracking2Maximum number of lost write change tracking buffers
_low_scn_headroom_warning_threshold_days90low SCN headroom warning threshold in days
_low_server_threshold0low server thresholds
_lowres_drift_allowed_sec5allowed lowres timer drift for VKTM
_lrgdbcz6_ignore_restrictionsFALSETemp parameter to ignore app script restrictions for lrgdbcz6
_ltc_trace0tracing level for load table conventional
_lthread_cleanup_intv_secs1interval for cleaning lightweight threads in secs
_lthread_clnup_hk_wait_secs3timeout after hard killing operation for lthread to exit
_lthread_clnup_pmon_softkill_wait_secs1wait timeout for PMON between soft kill and hard kill of lthreads
_lthread_clnup_spawner_sk_wait_secs30timeout for spawner between soft kill and hard kill of lthreads
_lthread_debugFALSEEnable Debugging mode for lightweight threads
_lthread_enabledTRUEEnable lightweight threads
_lthread_idle_timeout_secs600Idle timeout in seconds for LWTs to terminate
_lthread_max_spawn_time_csecs12000maximum time interval a spawner will wait for a lthread to get ready
_lthread_spawn_check_intv_ms10time interval for a spawner to check for spawnee to get ready
_lthread_step_debuggingFALSEEnable Step wise Debugging mode for lightweight threads
_main_dead_process_scan_interval0PMON main dead process scan interval (in seconds)
_master_direct_sends63direct sends for messages from master (DFS)
_mav_refresh_consistent_readTRUErefresh materialized views using consistent read snapshot
_mav_refresh_double_count_preventedFALSEmaterialized view MAV refreshes avoid double counting
_mav_refresh_opt0optimizations during refresh of materialized views
_mav_refresh_unionall_tables3# tables for union all expansion during materialized view refresh
_max_aq_persistent_queue_memory10max aq persistent queue memory
_max_async_wait_for_catch_up20Switchover wait time for async LNS to catch up in seconds
_max_clients_per_emon8maximum number of clients per emon
_max_cr_rollbacks1000Maximum number of CR rollbacks per block (LMS)
_max_data_transfer_cache_size536870912Maximum size of data transfer cache
_max_defer_gran_xfer_atonce10Maximum deferred granules transferred by MMAN atonce
_max_dynamic_processes320max dynamic processes count
_max_dynamic_sessions504max dynamic session count
_max_exponential_sleep0max sleep during exponential backoff
_max_filestat_tries10maximum number of file stat tries
_max_flashback_shrink_size1048576maximum size(in KBs) a datafile can be shrunk with flashback DB
_max_fsu_exptime7200Fast Space Usage: Entry expiration time in seconds
_max_fsu_segments1024Maximum segments to track for fast space usage
_max_fsu_sgapcent10Percentage of shared pool for Fast Space Usage
_max_fsu_stale_time600Allowed space usage staleness in seconds
_max_gg_extracts65535maximum limit for goldengate extract instances
_max_incident_file_sizeMaximum size (in KB, MB, GB, Blocks) of incident dump file
_max_io_size1048576Maximum I/O size in bytes for sequential file accesses
_max_kcnibr_ranges1048576Max number of nonlogged data block ranges
_max_large_io0IORM:max number of large I/O's to issue
_max_largepage_alloc_time_secs10Maximum number of seconds to spend on largepage allocation
_max_library_cache_dumps1000Maximum number of dumps allowed
_max_lns_shutdown_archival_time30Maximum time spent by LNS to archive last log during shutdown
_max_log_write_parallelism1Maximum parallelism within a log write (auto=0)
_max_lwt_cpu_ratio2ratio to determine the maximum CPUs for LWTs
_max_outstanding_log_writes2Maximum number of outstanding redo log writes
_max_pending_scn_bcasts9maximum number of pending SCN broadcasts
_max_physmem_perc_mmt90maximum percentage of physical memory for memory_max_target
_max_physmem_perc_sga80maximum percentage of physical memory for SGA
_max_protocol_support10000Max occurrence protocols supported in a process
_max_queued_report_requests300Maximum number of report requests that can be queued in a list
_max_reasonable_scn_rate32768Max reasonable SCN rate
_max_remote_tool_requests10Maximum number of remote tool requests
_max_report_flushes_percycle5Max no of report requests that can be flushed per cycle
_max_row_cache_dumps1000Maximum number of dumps allowed
_max_rwgs_groupings8192maximum no of groupings on materialized views
_max_services8200maximum number of database services
_max_shrink_obj_stats0number of segments for which shrink stats will be maintained
_max_shutdown_abort_secs10Maximum wait time for shutdown abort in seconds
_max_sleep_holding_latch4max time to sleep while holding a latch
_max_small_io0IORM:max number of small I/O's to issue
_max_spacebg_msgs_percentage50maximum space management interrupt message throttling
_max_spacebg_slaves1024maximum space management background slaves
_max_spacebg_tasks8192maximum space management background tasks
_max_sql_stmt_length0Maximum allowed sql statement length
_max_stmt_tries_sync2Maximum number of tries of a statement during Application Sync
_max_string_size_bypass0controls error checking for the max_string_size parameter
_max_sys_next_extent0Dictionary managed SYSTEM tablespace maximum next extent size in MB (allowed range [16-4095], 0 if unlimited)
_maxrpop_files_inst4Maxmimum files rpop works on per instance
_maxrpop_instances8Maxmimum rpop file instances
_mdapi_transform_engineLPXDDL transformation engine
_media_recovery_read_batch32media recovery block read batch
_mem_annotation_pr_lev0private memory annotation collection level
_mem_annotation_scale1memory annotation pre-allocation scaling
_mem_annotation_sh_lev0shared memory annotation collection level
_mem_annotation_storeFALSEmemory annotation in-memory store
_mem_std_extent_size4096standard extent size for fixed-size-extent heaps
_memoptimize_xmem_pool_size0Size of MEMOPTIMIZE buffer pool for standard block size buffers on extended memory
_memory_adi_bytes_per_alloc0bytes per allocation to get memory application data integrity
_memory_adi_enabledTRUEenable memory application data integrity
_memory_adi_extendFALSEenable ADI for kgh headers and free memory
_memory_adi_heap_mask610enable ADI versioning for these heaps
_memory_adi_module_mask0bit mask of modules to enable ADI versioning
_memory_adi_precise_errorsFALSEenable precise memory application data integrity errors
_memory_broker_log_stat_entries5memory broker num stat entries
_memory_broker_marginal_utility_bc12Marginal Utility threshold pct for bc
_memory_broker_marginal_utility_sp7Marginal Utility threshold pct for sp
_memory_broker_sga_grow_splitTRUEif TRUE, allow sga grow to be split between cache and sp
_memory_broker_sga_grow_splitif_size20split sga target grow if atleast this many granules.
_memory_broker_sga_shrink_chunk_size20if kmgsbshnkbrk set, sga request resize chunk size in granules.
_memory_broker_sga_shrink_chunkedTRUEif TRUE, break a large sga shrink request to chunks
_memory_broker_shrink_heaps15memory broker allow policy to shrink shared pool
_memory_broker_shrink_java_heaps900memory broker allow policy to shrink java pool
_memory_broker_shrink_streams_pool900memory broker allow policy to shrink streams pool
_memory_broker_shrink_timeout60000000memory broker policy to timeout shrink shared/java pool
_memory_broker_stat_interval30memory broker statistics gathering interval for auto sga
_memory_checkinuse_timeintv30check inuse time interval
_memory_imm_mode_without_autosgaTRUEAllow immediate mode without sga/memory target
_memory_initial_sga_split_perc60Initial default sga target percentage with memory target
_memory_management_tracing0trace memory management activity
_memory_max_tgt_inc_cnt0counts the times checker increments memory target
_memory_mgmt_fail_immreqFALSEalways fail immediate mode request
_memory_mgmt_immreq_timeout150time in seconds to time out immediate mode request
_memory_nocancel_defsgareqFALSEdo not cancel deferred sga reqs with auto-memory
_memory_sanity_check0partial granule sanity check
_merge_monitor_threshold10000threshold for pushing information to MERGE monitoring
_messages640message queue resources - dependent on # processes & # buffers
_mga_large_page_pathlarge page path
_mgd_rcv_handle_orphan_datafilesFALSEManaged recovery handle orphan datafile situation
_midtier_affinity_cluswait_prc_threshold6cluster wait precentage threshold to enter affinity
_midtier_affinity_goodness_threshold2000goodness gradient threshold to dissolve affinity
_min_autotask_percentage
_min_lwt_lt24minimum low threshold for LWTs
_min_spacebg_slaves2minimum space management background slaves
_min_sys_percentage
_min_sys_process2minimum system processess
_min_time_between_psp0_diag_secs300minimum time between PSP0 diagnostic used for flow control
_min_undosegs_for_parallel_fptr100minimum undo segments for parallel first-pass recovery
_minact_timeout180Configurable interval for minact-scn
_minfree_plus0max percentage of block space + minfree before we mark block full
_minimal_stats_aggregationTRUEprohibit stats aggregation at compile/partition maintenance time
_minimum_blocks_to_shrink0minimum number freeable blocks for shrink to be present
_minimum_db_flashback_retention60Minimum flashback retention
_minimum_extents_to_shrink1minimum number freeable extents for shrink to be present
_minmax_spacebg_slaves8min-max space management background slaves
_mira_free_unused_buffersTRUEfree unused buffers when idle
_mira_mark_archivelog_timeout60mira mark archive log as applied timeout
_mira_num_local_buffers25Number of local buffers for multi instance media recovery
_mira_num_receive_buffers25Number of receive buffers for multi instance media recovery
_mira_rcv_catchup_buffers5Number of buffers to allocate before catch up
_mira_rcv_max_buffers500Maximum number of outstanding buffers
_mira_sender_process2Number of sender processes
_mirror_redo_buffersFALSESave buffers for debugging redo corruptions
_mle_compilation_errors_are_fatalFALSEfailed compilations are fatal for MLE
_mle_compile_immediatelyFALSEforce compilation for MLE
_mle_enable_compilationFALSEenable runtime compilation for MLE
_mmv_query_rewrite_enabledTRUEallow rewrites with multiple MVs and/or base tables
_modify_column_index_unusableFALSEallow ALTER TABLE MODIFY(column) to violate index key length limit
_modify_other_app_objectFALSEParameter to allow modification of another application's object
_monitor_sql_stmt_lengthFALSEMonitor sql statement length
_monitor_workload_interval24workload monitoring interval in hours
_mpmt_enabledFALSEMPMT mode enabled
_mpmt_enabled_backgrounds*mpmt enabled backgrounds
_mpmt_fg_enabledFALSEMPMT mode foreground enabled
_mpmt_fthread_mode0MPMT - Fthreads Mode for FG/BG/ALL
_mpmt_prefer_enabledTRUEMPMT prefer mode enabled
_mpmt_procs_per_osp100max procs per osp
_mpmt_single_process_instanceFALSEMPMT - single process instance mode enabled
_mpmt_use_fthreadFALSEMPMT - Use Fthreads
_multi_instance_pmrTRUEenable multi instance redo apply
_multi_join_key_table_lookupTRUETRUE iff multi-join-key table lookup prefetch is enabled
_multi_transaction_optimization_enabledTRUEreduce SGA memory use during create of a partitioned table
_multiple_char_set_cdbTRUEMultiple character sets enabled in CDB
_multiple_instance_recoveryFALSEuse multiple instances for media recovery
_multiple_name_convert_patternsFALSEapply multiple patterns on a name during file_name_convert in PDB
_mutex_spin_count255Mutex spin count
_mutex_wait_scheme2Mutex wait scheme
_mutex_wait_time1Mutex wait time
_mv_access_compute_fresh_dataONmv access compute fresh data
_mv_add_log_placeholderTRUEadd log placeholder
_mv_cleanup_orphaned_metadataTRUEcleanup orphaned materialized view metadata
_mv_complete_refresh_conventionalFALSEuse conventional INSERTs for MV complete refresh
_mv_deferred_no_log_age_valTRUEavoid build deferred MV log age validate
_mv_expression_extend_size4096MV expression extend size
_mv_generalized_oj_refresh_optTRUEenable/disable new algorithm for MJV with generalized outer joins
_mv_logical_partition_rewrite_enabledFALSEenable/disable Logical Partition based rewrite
_mv_logical_partition_tracking_enabledFALSEenable/disable Logical Partition Tracking
_mv_master_lock_timeout3timeout that mv create/drop waits to lock the master table
_mv_refresh_ana0what percent to analyze after complete/PCT refresh
_mv_refresh_costingrulerefresh decision based on cost or on rules
_mv_refresh_delta_fraction10delta mv as fractional percentage of size of mv
_mv_refresh_enhanced_dml_detectionON_RCenable enhanced detection of DML types from MV log
_mv_refresh_eutTRUErefresh materialized views using EUT(partition)-based algorithm
_mv_refresh_force_parallel_query0force materialized view refreshes to use parallel query
_mv_refresh_insert_no_appendTRUEmaterialized view refresh using insert no append
_mv_refresh_new_setup_disabledFALSEmaterialized view MV refresh new setup disabling
_mv_refresh_no_idx_rebuildFALSEavoid index rebuild as part of the MV refresh
_mv_refresh_pipe_timeout600timeout that MV refresh coordinator waits for a job pipe
_mv_refresh_pkfk_data_units_optautocontrol MV refresh based on the assumption of PK-FK data units
_mv_refresh_pkfk_relationship_optTRUEcontrol MV refresh based on the use of PK-FK relationships
_mv_refresh_rebuild_percentage10minimum percentage change required in MV to force an indexrebuild
_mv_refresh_selectionsTRUEcreate materialized views with selections and fast refresh
_mv_refresh_shrink_logTRUEmaterialized view refresh shrink MV log
_mv_refresh_truncate_logFALSEmaterialized view refresh truncate MV log
_mv_refresh_update_analysisTRUEmaterialized view refresh using update analysis
_mv_refresh_use_hash_sjTRUEuse hash_sj hint in queries
_mv_refresh_use_no_mergeTRUEuse no_merge hint in queries
_mv_refresh_use_statsFALSEpass cardinality hints to refresh queries
_mv_refsched_timeincr300000proportionality constant for dop vs. time in MV refresh
_mv_rolling_invFALSEcreate/alter mv uses rolling cursor invalidation instead of immediate
_mwin_scheduleTRUEEnable/disable Maintenance Window Schedules
_nameservice_consistency_checkTRUENameService Consistency check switch
_nameservice_request_batchingTRUENameService request batching switch
_nbr_recovery_max_request_size8the maximum size in MBs of a request for data blocks
_nbr_recovery_target_bufs0the target number of oustanding buffers to maintain
_nbr_recovery_timeout60seconds recovery will wait for any invalid block range to arrive
_nchar_imp_cnvTRUENLS allow Implicit Conversion between CHAR and NCHAR
_nchar_imp_convTRUEshould implicit conversion bewteen clob and nclob be allowed
_ncmb_readahead_enabled0enable multi-block readahead for an index scan
_ncmb_readahead_tracing0turn on multi-block readahead tracing
_ncomp_shared_objects_dirnative compilation shared objects dir
_ndb_enableFALSENative Database Blockchain Enable
_nested_loop_fudge100nested loop fudge
_nested_mv_fast_oncommit_enabledTRUEnested MV refresh fast on commit allowed
_new_initial_join_ordersTRUEenable initial join orders based on new ordering heuristics
_new_sort_cost_estimateTRUEenables the use of new cost estimate for sort
_newsort_enabledTRUEcontrols whether new sorts can be used as system sort
_newsort_ordered_pct63controls when new sort avoids sorting ordered input
_newsort_type0specifies options for the new sort algorithm
_next_pdbid3Hint for the next PDBID to use when creating a new PDB entry
_nineteenth_spare_parameternineteenth spare parameter - integer
_nineteenth_spare_pdb_parameternineteenth spare pdb parameter - integer
_ninetieth_spare_parameterninetieth spare parameter - string
_ninety-eighth_spare_parameterninety-eighth spare parameter - string
_ninety-fifth_spare_parameterninety-fifth spare parameter - string
_ninety-first_spare_parameterninety-first spare parameter - string
_ninety-fourth_spare_parameterninety-fourth spare parameter - string
_ninety-ninth_spare_parameterninety-ninth spare parameter - string
_ninety-second_spare_parameterninety-second spare parameter - string
_ninety-seventh_spare_parameterninety-seventh spare parameter - string
_ninety-sixth_spare_parameterninety-sixth spare parameter - string
_ninety-third_spare_parameterninety-third spare parameter - string
_ninth_spare_pdb_parameterninth spare pdb parameter - integer
_nlj_batching_ae_flag2FAE flag type set after restoring to IO batching buffer
_nlj_batching_enabled1enable batching of the RHS IO in NLJ
_nlj_batching_misses_enabled1enable exceptions for buffer cache misses
_nls_binaryTRUEforce binary collation
_nls_parameter_sync_enabledTRUEenables or disables updates to v$parameter whenever an alter session statement modifies various nls parameters
_no_catalogoptions whose schemas should not be created
_no_objectsFALSEno object features are used
_no_or_expansionFALSEOR expansion during optimization disabled
_no_recovery_through_resetlogsFALSEno recovery through this resetlogs operation
_no_small_fileFALSENot to apply new extent scheme for small file temp spaces
_no_snapshot_root_cloneFALSENo snapshot clone during Application Root Clone creation
_no_stale_joinback_rewriteFALSENo joinbacks if mv is stale
_node_instcnt_average_interval1800node inst count average interval in seconds
_node_instcnt_sample_frequency60node inst count average sample frequency in seconds
_node_instcnt_update_frequency300node inst count average global update frequency in seconds
_nologging_apply_stall_time1000milli-seconds recovery waits after DTC full before changing RCVID
_nologging_block_cleanout_delay300Nologging standby: block cleanout delay (seconds)
_nologging_fetch_demote_count10Nologging standby fetch demote count
_nologging_fetch_initial_interval2seconds recovery waits between issuing fetches for old ranges
_nologging_fetch_retry_interval_cold1800Interval before fetch request for older invalid block range
_nologging_fetch_retry_interval_hot60Interval before fetch request for recently created invalid block range
_nologging_fetch_slv_wt600Nologging standby fetch slave wait time
_nologging_kcnbuf_hash_buckets1024Number of nologging buffer hash buckets
_nologging_kcnbuf_hash_latches256Number of nologging buffer hash latches
_nologging_load_slotsz1048576Nologging standby: direct load buffer size
_nologging_mode_override0Override the database logging mode; 1=Force, 2=NoForce, 3=LP, 4=DA
_nologging_progress_keep_alive10Nologging standby progress keep alive time
_nologging_sdcl_append_wait200Nologging standby append sdcl wait time
_nologging_sendbuf_ratio90Nologging standby: outstanding send buffer ratio
_nologging_slots20Nologging standby: initial buffer count
_nologging_standby_cold_buffer_timeout500Centi-seconds recovery will wait for a buffer that is not being sent by a direct load client in Nologging Standby Data Availability mode
_nologging_standby_dtc_expire600The number of seconds a Data Transfer Cache buffer may remain unclaimed
_nologging_standby_fetch_disableFALSEcontrols whether invalid block ranges are fecthed during recovery
_nologging_standby_hot_buffer_timeout500Centi-seconds recovery will wait for a buffer being sent by a direct load client in Nologging Standby Data Availabilty mode
_nologging_standby_refetch_disableFALSEcontrols fetching of pre-existing invalid block ranges during standby recovery
_nologging_txn_cmt_wait1500Nologging standby transaction commit wait time
_nologging_txn_history_to_sessions_percent100Ratio, as a percentage, of sessions to set X$KCNT max. size
_non_app_ignore_errorsTRUEignore errors during containers() on non-application object
_non_blocking_hard_parse_min_extend_time2minimum additional lifetime added to cursor
_nonce_history_buffer_size0Size of Nonce History Buffer
_nonfatalprocess_redo_dump_time_limit3600time limit, in secs, for diagnostic redo dumps by a non-fatal process
_noseg_for_unusable_index_enabledTRUEno segments for unusable indexes if set to TRUE
_notify_crsFALSEnotify cluster ready services of startup and shutdown
_ns_max_flush_wt1Flush wait time for NetServer to flush oustanding writes
_ns_max_send_delay15Data Loss Time Bound for NetServer
_num_longop_child_latches4number of child latches for long op array
_num_rlslaves8number of rl slaves to clear orls
_numa_buffer_cache_stats0Configure NUMA buffer cache stats
_numa_shift_enabledTRUEEnable NUMA shift
_numa_shift_value0user defined value for numa nodes shift
_numa_trace_level0numa trace event
_number_cached_attributes10maximum number of cached attributes per instance
_number_cached_group_memberships2048maximum number of cached group memberships
_number_group_memberships_per_cache_line6maximum number of group memberships per cache line
_number_ksim_group_req_threshold64ksim maximum number of group operations requests
_number_of_undo_blocks_to_prefetch8number of undo blocks to prefetch
_numgrans_per_file64Number of granules per SGA file
_nusa_data_containerslist of data containers in the nusa universe
_nusa_metadata_storemetadata store in nusa
_nvm_dispatcher_bind_policy1NVM Dispatcher binding policy
_nvm_dispatchers3number of NVM Dispatcher Slaves
_nvmeof_zcopy_enableFALSEEnable Zero Copy for NVMeoF
_obj_ckpt_tracing0Enable object checkpoint tracing
_object_activity_control0controls tracing for object activity tracking system (OATS)
_object_activity_disable0disables some object activity tracking (OATS)
_object_activity_trackingTRUEenable object activity tracking system (OATS)
_object_link_fixed_enabledTRUEobject linked views evaluated using fixed table
_object_linked_remoteFALSEEnable remote transformation of Object Linked table
_object_number_cache_size5Object number cache size
_object_reuse_bast2if 1 or higher, handle object reuse
_object_statisticsTRUEenable the object level statistics collection
_object_stats_max_entries3072Maximum number of entries to be tracked per stat
_obsolete_result_cache_modeMANUALUSERS SHOULD NOT SET THIS! Used for old qksced parameterof result_cache_mode
_odci_aggregate_save_spaceFALSEtrade speed for space in user-defined aggregation
_odci_index_pmo_rebuildFALSEdomain index running pmo rebuild
_offline_rollback_segmentsoffline undo segment list
_ofs_read_buffer_size1031680OFS read ahead buffer size in bytes
_ofs_write_buffer_size1048576OFS write buffer size in bytes
_ogms_homeGMS home directory
_olap_adv_comp_stats_cc_precomp20do additional predicate stats analysis for AW rowsource
_olap_adv_comp_stats_max_rows100000do additional predicate stats analysis for AW rowsource
_olap_aggregate_buffer_size1048576OLAP Aggregate max buffer size
_olap_aggregate_flags0OLAP Aggregate debug flags
_olap_aggregate_function_cache_enabledTRUEOLAP Aggregate function cache enabled
_olap_aggregate_max_thread_tuples5000OLAP Aggregate max thread tuples creation
_olap_aggregate_min_buffer_size1024OLAP Aggregate min buffer size
_olap_aggregate_min_thread_status64OLAP Aggregate minimum cardinality of dimensions for thread
_olap_aggregate_multipath_hierFALSEOLAP Aggregate Multi-path Hierarhies enabled
_olap_aggregate_statlen_thresh1024OLAP Aggregate status array usage threshold
_olap_aggregate_work_per_thread1024OLAP Aggregate max work parents
_olap_aggregate_worklist_max5000OLAP Aggregate max worklists generated at once
_olap_allocate_errorlog_format%8p %8y %8z %e (%n)OLAP Allocate Errorlog Format
_olap_allocate_errorlog_headerDim Source Basis
%-8d %-8s %-8b Description
-------- -------- -------- -----------OLAP Allocate Errorlog Header format
_olap_analyze_max10000OLAP DML ANALYZE command max cells to analyze
_olap_continuous_trace_filefalseOLAP logging definition
_olap_dbgoutfile_echo_to_eventlogFALSEOLAP DbgOutfile copy output to event log (tracefile)
_olap_dimension_corehash_forceFALSEOLAP Dimension In-Core Hash Table Force
_olap_dimension_corehash_large50000OLAP Dimension In-Core Hash Table Large Threshold
_olap_dimension_corehash_pressure90OLAP Dimension In-Core Hash Table Pressure Threshold
_olap_dimension_corehash_size30OLAP Dimension In-Core Hash Table Maximum Memory Use
_olap_disable_loop_optimizedFALSEDisable LOOP OPTIMIZED directive in OLAP_TABLE
_olap_eif_export_lob_size2147483647OLAP EIF Export BLOB size
_olap_lmgen_dim_size100Limitmap generator dimension column size
_olap_lmgen_meas_size1000Limitmap generator measure column size
_olap_object_hash_class3OLAP Object Hash Table Class
_olap_page_pool_expand_rate20OLAP Page Pool Expand Rate
_olap_page_pool_hi50OLAP Page Pool High Watermark
_olap_page_pool_hit_target100OLAP Page Pool Hit Target
_olap_page_pool_low262144OLAP Page Pool Low Watermark
_olap_page_pool_pressure90OLAP Page Pool Pressure Threshold
_olap_page_pool_shrink_rate50OLAP Page Pool Shrink Rate
_olap_parallel_update_server_num0OLAP parallel update server count
_olap_parallel_update_small_threshold1000OLAP parallel update threshold for number of small pagespaces
_olap_parallel_update_threshold1000OLAP parallel update threshold in pages
_olap_row_load_time_precisionDEFAULTOLAP Row Load Time Precision
_olap_sesscache_enabledTRUEOLAP Session Cache knob
_olap_sort_buffer_pct10OLAP Sort Buffer Size Percentage
_olap_sort_buffer_size262144OLAP Sort Buffer Size
_olap_statbool_corebits20000000OLAP Status Boolean max incore bits
_olap_statbool_threshold8100OLAP Status Boolean CBM threshold
_olap_table_function_statisticsFALSESpecify TRUE to output OLAP table function timed statistics trace
_olap_wrap_errorsFALSEWrap error messages to OLAP outfile
_olapi_history_retentionFALSEenable olapi history retention
_olapi_iface_object_history1000enable olapi interface object history collection
_olapi_iface_object_history_retentionFALSEenable olapi interface object history retention
_olapi_iface_operation_history_retentionFALSEenable olapi interface operation history retention
_olapi_interface_operation_history1000enable olapi interface operation history collection
_olapi_memory_operation_history1000enable olapi memory alloc/free history collection
_olapi_memory_operation_history_pause_at_seqno0enable olapi memory alloc/free history collection pausing
_olapi_memory_operation_history_retentionFALSEenable olapi memory operation history retention
_olapi_session_history300enable olapi session history collection
_olapi_session_history_retentionFALSEenable olapi session history retention
_old_connect_by_enabledFALSEenable/disable old connect by
_old_extent_schemeFALSERevert to old extent allocation
_ols_cleanup_taskTRUEClean up unnecessary entries in OLS sessinfo table
_oltp_comp_dbg_scan0oltp compression scan debug
_oltp_compress_dbg0oltp compression debug
_oltp_compressionTRUEoltp compression enabled
_oltp_compression_gain10oltp compression gain
_oltp_spillFALSEspill rows for oltp compression if loader pga limit is exceeded
_omfenabledenable/disable OMF
_omni_enqueue_enable1Enable Omni Enqueue feature (0 = disable, 1 = enable on ASM (default), 2 = enable)
_one-hundred-and-eighteenth_spare_parameterone-hundred-and-eighteenth spare parameter - string
_one-hundred-and-eighth_spare_parameterone-hundred-and-eighth spare parameter - string
_one-hundred-and-eightieth_spare_parameterFALSEone-hundred-and-eightieth spare parameter - boolean
_one-hundred-and-eighty-eighth_spare_parameterFALSEone-hundred-and-eighty-eighth spare parameter - boolean
_one-hundred-and-eighty-fifth_spare_parameterFALSEone-hundred-and-eighty-fifth spare parameter - boolean
_one-hundred-and-eighty-first_spare_parameterFALSEone-hundred-and-eighty-first spare parameter - boolean
_one-hundred-and-eighty-fourth_spare_parameterFALSEone-hundred-and-eighty-fourth spare parameter - boolean
_one-hundred-and-eighty-ninth_spare_parameterFALSEone-hundred-and-eighty-ninth spare parameter - boolean
_one-hundred-and-eighty-second_spare_parameterFALSEone-hundred-and-eighty-second spare parameter - boolean
_one-hundred-and-eighty-seventh_spare_parameterFALSEone-hundred-and-eighty-seventh spare parameter - boolean
_one-hundred-and-eighty-sixth_spare_parameterFALSEone-hundred-and-eighty-sixth spare parameter - boolean
_one-hundred-and-eighty-third_spare_parameterFALSEone-hundred-and-eighty-third spare parameter - boolean
_one-hundred-and-eleventh_spare_parameterone-hundred-and-eleventh spare parameter - string
_one-hundred-and-fifteenth_spare_parameterone-hundred-and-fifteenth spare parameter - string
_one-hundred-and-fifth_spare_parameterone-hundred-and-fifth spare parameter - string
_one-hundred-and-fifty-eighth_spare_parameterFALSEone-hundred-and-fifty-eighth spare parameter - boolean
_one-hundred-and-fifty-fifth_spare_parameterFALSEone-hundred-and-fifty-fifth spare parameter - boolean
_one-hundred-and-fifty-fourth_spare_parameterFALSEone-hundred-and-fifty-fourth spare parameter - boolean
_one-hundred-and-fifty-ninth_spare_parameterFALSEone-hundred-and-fifty-ninth spare parameter - boolean
_one-hundred-and-fifty-seventh_spare_parameterFALSEone-hundred-and-fifty-seventh spare parameter - boolean
_one-hundred-and-fifty-sixth_spare_parameterFALSEone-hundred-and-fifty-sixth spare parameter - boolean
_one-hundred-and-first_spare_parameterone-hundred-and-first spare parameter - string
_one-hundred-and-fortieth_spare_parameterone-hundred-and-fortieth spare parameter - string list
_one-hundred-and-forty-seventh_spare_parameterFALSEone-hundred-and-forty-seventh spare parameter - boolean
_one-hundred-and-fourteenth_spare_parameterone-hundred-and-fourteenth spare parameter - string
_one-hundred-and-fourth_spare_parameterone-hundred-and-fourth spare parameter - string
_one-hundred-and-nineteenth_spare_parameterone-hundred-and-nineteenth spare parameter - string
_one-hundred-and-ninetieth_spare_parameterFALSEone-hundred-and-ninetieth spare parameter - boolean
_one-hundred-and-ninety-eighth_spare_parameterFALSEone-hundred-and-ninety-eighth spare parameter - boolean
_one-hundred-and-ninety-fifth_spare_parameterFALSEone-hundred-and-ninety-fifth spare parameter - boolean
_one-hundred-and-ninety-first_spare_parameterFALSEone-hundred-and-ninety-first spare parameter - boolean
_one-hundred-and-ninety-fourth_spare_parameterFALSEone-hundred-and-ninety-fourth spare parameter - boolean
_one-hundred-and-ninety-ninth_spare_parameterFALSEone-hundred-and-ninety-ninth spare parameter - boolean
_one-hundred-and-ninety-second_spare_parameterFALSEone-hundred-and-ninety-second spare parameter - boolean
_one-hundred-and-ninety-seventh_spare_parameterFALSEone-hundred-and-ninety-seventh spare parameter - boolean
_one-hundred-and-ninety-sixth_spare_parameterFALSEone-hundred-and-ninety-sixth spare parameter - boolean
_one-hundred-and-ninety-third_spare_parameterFALSEone-hundred-and-ninety-third spare parameter - boolean
_one-hundred-and-ninth_spare_parameterone-hundred-and-ninth spare parameter - string
_one-hundred-and-second_spare_parameterone-hundred-and-second spare parameter - string
_one-hundred-and-seventeenth_spare_parameterone-hundred-and-seventeenth spare parameter - string
_one-hundred-and-seventh_spare_parameterone-hundred-and-seventh spare parameter - string
_one-hundred-and-seventieth_spare_parameterFALSEone-hundred-and-seventieth spare parameter - boolean
_one-hundred-and-seventy-eighth_spare_parameterFALSEone-hundred-and-seventy-eighth spare parameter - boolean
_one-hundred-and-seventy-fifth_spare_parameterFALSEone-hundred-and-seventy-fifth spare parameter - boolean
_one-hundred-and-seventy-first_spare_parameterFALSEone-hundred-and-seventy-first spare parameter - boolean
_one-hundred-and-seventy-fourth_spare_parameterFALSEone-hundred-and-seventy-fourth spare parameter - boolean
_one-hundred-and-seventy-ninth_spare_parameterFALSEone-hundred-and-seventy-ninth spare parameter - boolean
_one-hundred-and-seventy-second_spare_parameterFALSEone-hundred-and-seventy-second spare parameter - boolean
_one-hundred-and-seventy-seventh_spare_parameterFALSEone-hundred-and-seventy-seventh spare parameter - boolean
_one-hundred-and-seventy-sixth_spare_parameterFALSEone-hundred-and-seventy-sixth spare parameter - boolean
_one-hundred-and-seventy-third_spare_parameterFALSEone-hundred-and-seventy-third spare parameter - boolean
_one-hundred-and-sixteenth_spare_parameterone-hundred-and-sixteenth spare parameter - string
_one-hundred-and-sixth_spare_parameterone-hundred-and-sixth spare parameter - string
_one-hundred-and-sixtieth_spare_parameterFALSEone-hundred-and-sixtieth spare parameter - boolean
_one-hundred-and-sixty-eighth_spare_parameterFALSEone-hundred-and-sixty-eighth spare parameter - boolean
_one-hundred-and-sixty-fifth_spare_parameterFALSEone-hundred-and-sixty-fifth spare parameter - boolean
_one-hundred-and-sixty-first_spare_parameterFALSEone-hundred-and-sixty-first spare parameter - boolean
_one-hundred-and-sixty-fourth_spare_parameterFALSEone-hundred-and-sixty-fourth spare parameter - boolean
_one-hundred-and-sixty-ninth_spare_parameterFALSEone-hundred-and-sixty-ninth spare parameter - boolean
_one-hundred-and-sixty-second_spare_parameterFALSEone-hundred-and-sixty-second spare parameter - boolean
_one-hundred-and-sixty-seventh_spare_parameterFALSEone-hundred-and-sixty-seventh spare parameter - boolean
_one-hundred-and-sixty-sixth_spare_parameterFALSEone-hundred-and-sixty-sixth spare parameter - boolean
_one-hundred-and-sixty-third_spare_parameterFALSEone-hundred-and-sixty-third spare parameter - boolean
_one-hundred-and-tenth_spare_parameterone-hundred-and-tenth spare parameter - string
_one-hundred-and-third_spare_parameterone-hundred-and-third spare parameter - string
_one-hundred-and-thirteenth_spare_parameterone-hundred-and-thirteenth spare parameter - string
_one-hundred-and-thirtieth_spare_parameterone-hundred-and-thirtieth spare parameter - string
_one-hundred-and-thirty-eighth_spare_parameterone-hundred-and-thirty-eighth spare parameter - string list
_one-hundred-and-thirty-fifth_spare_parameterone-hundred-and-thirty-fifth spare parameter - string list
_one-hundred-and-thirty-first_spare_parameterone-hundred-and-thirty-first spare parameter - string list
_one-hundred-and-thirty-fourth_spare_parameterone-hundred-and-thirty-fourth spare parameter - string list
_one-hundred-and-thirty-ninth_spare_parameterone-hundred-and-thirty-ninth spare parameter - string list
_one-hundred-and-thirty-second_spare_parameterone-hundred-and-thirty-second spare parameter - string list
_one-hundred-and-thirty-seventh_spare_parameterone-hundred-and-thirty-seventh spare parameter - string list
_one-hundred-and-thirty-sixth_spare_parameterone-hundred-and-thirty-sixth spare parameter - string list
_one-hundred-and-thirty-third_spare_parameterone-hundred-and-thirty-third spare parameter - string list
_one-hundred-and-twelfth_spare_parameterone-hundred-and-twelfth spare parameter - string
_one-hundred-and-twentieth_spare_parameterone-hundred-and-twentieth spare parameter - string
_one-hundred-and-twenty-eighth_spare_parameterone-hundred-and-twenty-eighth spare parameter - string
_one-hundred-and-twenty-fifth_spare_parameterone-hundred-and-twenty-fifth spare parameter - string
_one-hundred-and-twenty-first_spare_parameterone-hundred-and-twenty-first spare parameter - string
_one-hundred-and-twenty-fourth_spare_parameterone-hundred-and-twenty-fourth spare parameter - string
_one-hundred-and-twenty-ninth_spare_parameterone-hundred-and-twenty-ninth spare parameter - string
_one-hundred-and-twenty-second_spare_parameterone-hundred-and-twenty-second spare parameter - string
_one-hundred-and-twenty-seventh_spare_parameterone-hundred-and-twenty-seventh spare parameter - string
_one-hundred-and-twenty-sixth_spare_parameterone-hundred-and-twenty-sixth spare parameter - string
_one-hundred-and-twenty-third_spare_parameterone-hundred-and-twenty-third spare parameter - string
_one-hundredth_spare_parameterone-hundredth spare parameter - string
_oneside_colstat_for_equijoinsTRUEsanity check on default selectivity for like/range predicate
_onl_ddl_progress3track progress of online ddl
_onl_pmo_wait_query0online pmos wait for queries after swapping partitions
_onl_pmo_wait_timeout0online pmos wait for queries after swapping partitions timeout
_online_ctas_diag0controls dumping diagnostic information for online ctas
_online_file_conversion_batchsize16Online datafile move/conversion sync batchsize
_online_patch_disable_stack_checkFALSEdisable check for function on stack for online patches
_online_pmo_global_index_methodCLEANUP ONLYUnique global index method for partition maintenance DDLs
_ops_per_semopthe exact number of operations per semop system call
_optim_adjust_for_part_skewsTRUEadjust stats for skews across partitions
_optim_dict_stats_at_db_cr_upgTRUEenable/disable dictionary stats gathering at db create/upgrade
_optim_enhance_nnull_detectionTRUETRUE to enable index [fast] full scan more often
_optim_new_default_join_selTRUEimproves the way default equijoin selectivity are computed
_optim_peek_user_bindsTRUEenable peeking of user binds
_optimize_dvconfig_cloudpdbFALSEOptimize Database Vault setup for cloud PDB
_optimizer_adaptive_cursor_sharingTRUEoptimizer adaptive cursor sharing
_optimizer_adaptive_plan_control0internal controls for adaptive plans
_optimizer_adaptive_plans_continuousFALSEenable continuously adaptive plans
_optimizer_adaptive_plans_iterativeFALSEenable iterative adaptive plans
_optimizer_adaptive_random_seed0random seed for adaptive plans
_optimizer_adjust_for_nullsTRUEadjust selectivity for null values
_optimizer_ads_for_pqFALSEuse ADS for parallel queries
_optimizer_ads_max_table_count0maximum number of tables in a join under ADS
_optimizer_ads_result_cache_life3600result cache shelf life for ADS queries
_optimizer_ads_spd_cache_owner_limit64Maximum number of directives under an owner in SPD cache
_optimizer_ads_time_limit0maximum time limit (seconds) under ADS
_optimizer_ads_use_partial_resultsTRUEUse partial results of ADS queries
_optimizer_ads_use_result_cacheTRUEuse result cache for ADS queries
_optimizer_ads_use_spd_cacheTRUEuse Sql Plan Directives for caching ADS queries
_optimizer_aggr_groupby_elimTRUEgroup-by and aggregation elimination
_optimizer_allow_all_access_pathsTRUEallow all access paths
_optimizer_ansi_join_lateral_enhanceTRUEoptimization of left/full ansi-joins and lateral views
_optimizer_ansi_rearchitectureTRUEre-architecture of ANSI left, right, and full outer joins
_optimizer_answering_query_using_statsFALSEenable statistics-based query transformation
_optimizer_autostats_jobTRUEenable/disable auto stats collection job
_optimizer_aw_join_push_enabledTRUEEnables AW Join Push optimization
_optimizer_aw_stats_enabledTRUEEnables statistcs on AW olap_table table function
_optimizer_band_join_awareTRUEenable the detection of band join by the optimizer
_optimizer_batch_table_access_by_rowidTRUEenable table access by ROWID IO batching
_optimizer_better_inlist_costingALLenable improved costing of index access using in-list(s)
_optimizer_block_size8192standard block size used by optimizer
_optimizer_bushy_cost_factor100cost factor for bushy join
_optimizer_bushy_fact_dim_ratio20bushy join dimension to fact ratio
_optimizer_bushy_fact_min_size100000minimumm fact size for bushy join
_optimizer_bushy_joinoffenables bushy join
_optimizer_cache_statsFALSEcost with cache statistics
_optimizer_cartesian_enabledTRUEoptimizer cartesian join enabled
_optimizer_cbqt_factor50cost factor for cost-based query transformation
_optimizer_cbqt_no_size_restrictionTRUEdisable cost based transformation query size restriction
_optimizer_cbqt_or_expansionONenables cost based OR expansion
_optimizer_ceil_costTRUECEIL cost in CBO
_optimizer_cluster_by_rowidTRUEenable/disable the cluster by rowid feature
_optimizer_cluster_by_rowid_batch_size100Sorting batch size for cluster by rowid feature
_optimizer_cluster_by_rowid_batchedTRUEenable/disable the cluster by rowid batching feature
_optimizer_cluster_by_rowid_control129internal control for cluster by rowid feature mode
_optimizer_coalesce_subqueriesTRUEconsider coalescing of subqueries optimization
_optimizer_compare_plans_control0compare plans controls for testing
_optimizer_complex_pred_selectivityTRUEenable selectivity estimation for builtin functions
_optimizer_compute_index_statsTRUEforce index stats collection on index creation/rebuild
_optimizer_connect_by_cb_whr_onlyFALSEuse cost-based transformation for whr clause in connect by
_optimizer_connect_by_combine_swTRUEcombine no filtering connect by and start with
_optimizer_connect_by_cost_basedTRUEuse cost-based transformation for connect by
_optimizer_connect_by_elim_dupsTRUEallow connect by to eliminate duplicates from input
_optimizer_control_shard_qry_processing65472control shard query processing
_optimizer_correct_sq_selectivityTRUEforce correct computation of subquery selectivity
_optimizer_cost_based_transformationLINEARenables cost-based query transformation
_optimizer_cost_filter_predFALSEenables costing of filter predicates in IO cost model
_optimizer_cost_hjsmj_multimatchTRUEadd cost of generating result set when #rows per key > 1
_optimizer_cost_modelCHOOSEoptimizer cost model
_optimizer_cube_join_enabledTRUEenable cube join
_optimizer_db_blocks_buffers0optimizer value for _db_blocks_buffers
_optimizer_degree0force the optimizer to use the same degree of parallelism
_optimizer_dim_subq_join_selTRUEuse join selectivity in choosing star transformation dimensions
_optimizer_disable_strans_sanity_checks0disable star transformation sanity checks
_optimizer_distinct_agg_transformTRUETransforms Distinct Aggregates to non-distinct aggregates
_optimizer_distinct_eliminationTRUEEliminates redundant SELECT DISTNCT's
_optimizer_distinct_placementTRUEconsider distinct placement optimization
_optimizer_dsdir_usage_control0controls optimizer usage of dynamic sampling directives
_optimizer_dyn_smp_blks32number of blocks for optimizer dynamic sampling
_optimizer_eliminate_filtering_joinTRUEoptimizer filtering join elimination enabled
_optimizer_eliminate_subqueryTRUEconsider elimination of subquery optimization
_optimizer_enable_density_improvementsTRUEuse improved density computation for selectivity estimation
_optimizer_enable_extended_statsTRUEuse extended statistics for selectivity estimation
_optimizer_enable_plsql_statsTRUEUse statistics of plsql functions
_optimizer_enable_table_lookup_by_nlTRUEconsider table lookup by nl transformation
_optimizer_enhanced_filter_pushTRUEpush filters before trying cost-based query transformation
_optimizer_enhanced_join_eliminationTRUEEnhanced(12.2) join elimination
_optimizer_exists_to_any_rewriteTRUEconsider exists-to-any rewrite of subqueries
_optimizer_extend_jppd_view_typesTRUEjoin pred pushdown on group-by, distinct, semi-/anti-joined view
_optimizer_extended_cursor_sharingUDOoptimizer extended cursor sharing
_optimizer_extended_cursor_sharing_relSIMPLEoptimizer extended cursor sharing for relational operators
_optimizer_extended_stats_usage_control192controls the optimizer usage of extended stats
_optimizer_false_filter_pred_pullupTRUEoptimizer false predicate pull up transformation
_optimizer_fast_access_pred_analysisTRUEuse fast algorithm to traverse predicates for physical optimizer
_optimizer_fast_pred_transitivityTRUEuse fast algorithm to generate transitive predicates
_optimizer_feedback_controlcontrols the optimizer feedback framework
_optimizer_filter_pred_pullupTRUEuse cost-based flter predicate pull up transformation
_optimizer_filter_pushdownTRUEenable/disable filter predicate pushdown
_optimizer_fkr_index_cost_bias10Optimizer index bias over FTS/IFFS under first K rows mode
_optimizer_force_CBQTforce CBQT transformation regardless of cost
_optimizer_free_transformation_heapTRUEfree transformation subheap after each transformation
_optimizer_full_outer_join_to_outerTRUEenable/disable full outer to left outer join conversion
_optimizer_gather_feedbackTRUEoptimizer gather feedback
_optimizer_gather_stats_on_conventional_config0settings for optimizer online stats gathering on conventional DML
_optimizer_gather_stats_on_conventional_dmlFALSEoptimizer online stats gathering for conventional DML
_optimizer_gather_stats_on_loadTRUEenable/disable online statistics gathering
_optimizer_gather_stats_on_load_allFALSEenable/disable online statistics gathering for nonempty segments
_optimizer_gather_stats_on_load_histFALSEenable/disable online histogram gathering for loads
_optimizer_gather_stats_on_load_indexTRUEenable/disable online index stats gathering for loads
_optimizer_generate_ptf_implied_predsTRUEGenerate implied predicates for PTF
_optimizer_generate_transitive_predTRUEoptimizer generate transitive predicates
_optimizer_group_by_placementTRUEconsider group-by placement optimization
_optimizer_hll_entry4096number of entries in hll hash table
_optimizer_hybrid_fpwj_enabledTRUEenable hybrid full partition-wise join when TRUE
_optimizer_improve_selectivityTRUEimprove table and partial overlap join selectivity computation
_optimizer_inmemory_access_pathTRUEoptimizer access path costing for in-memory
_optimizer_inmemory_autodopTRUEoptimizer autoDOP costing for in-memory
_optimizer_inmemory_bloom_filterTRUEcontrols serial bloom filter for in-memory tables
_optimizer_inmemory_capture_stored_statsTRUEoptimizer capture and store statistics for in-memory tables
_optimizer_inmemory_cluster_aware_dopTRUEAffinitize DOP for inmemory objects
_optimizer_inmemory_gen_pushable_predsTRUEoptimizer generate pushable predicates for in-memory
_optimizer_inmemory_minmax_pruningTRUEcontrols use of min/max pruning for costing in-memory tables
_optimizer_inmemory_pruning_ratio_rows100in-memory pruning ratio for # rows (% of rows remaining after pruning)
_optimizer_inmemory_quotient0in-memory quotient (% of rows in in-memory format)
_optimizer_inmemory_table_expansionTRUEoptimizer in-memory awareness for table expansion
_optimizer_inmemory_use_stored_statsAUTOoptimizer use stored statistics for in-memory tables
_optimizer_instance_count0force the optimizer to use the specified number of instances
_optimizer_interleave_jppdTRUEinterleave join predicate pushdown during CBQT
_optimizer_interleave_or_expansionTRUEinterleave OR Expansion during CBQT
_optimizer_invalidation_period18000time window for invalidation of cursors of analyzed objects
_optimizer_join_elimination_enabledTRUEoptimizer join elimination enabled
_optimizer_join_factorizationTRUEuse join factorization transformation
_optimizer_join_order_control3controls the optimizer join order search algorithm
_optimizer_join_sel_sanity_checkTRUEenable/disable sanity check for multi-column join selectivity
_optimizer_key_vector_aggr_factor75the required aggregation between IJK and DGK
_optimizer_key_vector_payloadTRUEenables or disables dimension payloads in vector transform
_optimizer_key_vector_payload_dim_aggsTRUEenables or disables dimension payloading of aggregates in VT
_optimizer_key_vector_pruning_enabledTRUEenables or disables key vector partition pruning
_optimizer_key_vector_use_max_size1048576maximum key vector use size (in KB)
_optimizer_max_permutations2000optimizer maximum join permutations per query block
_optimizer_min_cache_blocks10set minimum cached blocks
_optimizer_mjc_enabledTRUEenable merge join cartesian
_optimizer_mode_forceTRUEforce setting of optimizer mode for user recursive SQL also
_optimizer_multi_level_push_predTRUEconsider join-predicate pushdown that requires multi-level pushdown to base table
_optimizer_multi_table_outerjoinTRUEallows multiple tables on the left of outerjoin
_optimizer_multicol_join_eliminationTRUEeliminate multi-column key based joins
_optimizer_multiple_cenvgenerate and run plans using several compilation environments
_optimizer_multiple_cenv_reportresultcontrol what to report in trace file when run in multi-plan mode
_optimizer_multiple_cenv_stmtquerycontrol the types of statements that are run in multi-plan mode
_optimizer_native_full_outer_joinFORCEexecute full outer join using native implementaion
_optimizer_nested_loop_joinonfavor/unfavor nested loop join
_optimizer_nested_rollup_for_gset100number of groups above which we use nested rollup exec for gset
_optimizer_new_join_card_computationTRUEcompute join cardinality using non-rounded input values
_optimizer_nlj_hj_adaptive_joinTRUEallow adaptive NL Hash joins
_optimizer_non_blocking_hard_parseTRUEenable non-blocking hard parse
_optimizer_null_accepting_semijoinTRUEenables null-accepting semijoin
_optimizer_null_aware_antijoinTRUEnull-aware antijoin parameter
_optimizer_or_expansionDEPTHcontrol or expansion approach used
_optimizer_or_expansion_subheapTRUEUse subheap for optimizer or-expansion
_optimizer_order_by_elimination_enabledTRUEEliminates order bys from views before query transformation
_optimizer_outer_join_to_innerTRUEenable/disable outer to inner join conversion
_optimizer_outer_to_anti_enabledTRUEEnable transformation of outer-join to anti-join if possible
_optimizer_partial_join_evalTRUEpartial join evaluation parameter
_optimizer_percent_parallel101optimizer percent parallel
_optimizer_performance_feedbackOFFcontrols the performance feedback
_optimizer_proc_rate_levelBASICcontrol the level of processing rates
_optimizer_proc_rate_sourceDEFAULTcontrol the source of processing rates
_optimizer_purge_stats_iteration_row_count10000number of rows to be deleted at each iteration of the stats purging process
_optimizer_push_down_distinct0push down distinct from query block to table
_optimizer_push_pred_cost_basedTRUEuse cost-based query transformation for push pred optimization
_optimizer_random_plan0optimizer seed value for random plans
_optimizer_reduce_groupby_keyTRUEgroup-by key reduction
_optimizer_reuse_cost_annotationsTRUEreuse cost annotations during cost-based query transformation
_optimizer_rownum_bind_default10Default value to use for rownum bind
_optimizer_rownum_pred_based_fkrTRUEenable the use of first K rows due to rownum predicate
_optimizer_save_statsTRUEenable/disable saving old versions of optimizer stats
_optimizer_search_limit5optimizer search limit
_optimizer_self_induced_cache_costFALSEaccount for self-induced caching
_optimizer_skip_scan_enabledTRUEenable/disable index skip scan
_optimizer_skip_scan_guessFALSEconsider index skip scan for predicates with guessed selectivity
_optimizer_sortmerge_join_enabledTRUEenable/disable sort-merge join method
_optimizer_sortmerge_join_inequalityTRUEenable/disable sort-merge join using inequality predicates
_optimizer_squ_bottomupTRUEenables unnesting of subquery in a bottom-up manner
_optimizer_star_tran_in_with_clauseTRUEenable/disable star transformation in with clause queries
_optimizer_star_trans_min_cost0optimizer star transformation minimum cost
_optimizer_star_trans_min_ratio0optimizer star transformation minimum ratio
_optimizer_starplan_enabledTRUEoptimizer star plan enabled
_optimizer_stats_on_conventional_dml_sample_rate100sampling rate for online stats gathering on conventional DML
_optimizer_strans_adaptive_pruningTRUEallow adaptive pruning of star transformation bitmap trees
_optimizer_synopsis_min_size2minimal synopsis size (kb)
_optimizer_system_stats_usageTRUEsystem statistics usage
_optimizer_table_expansionTRUEconsider table expansion transformation
_optimizer_tracenoneoptimizer trace parameter
_optimizer_track_hint_usageTRUEenable tracking of optimizer hint usage
_optimizer_transitivity_retainTRUEretain equi-join pred upon transitive equality pred generation
_optimizer_try_st_before_jppdTRUEtry Star Transformation before Join Predicate Push Down
_optimizer_undo_changesFALSEundo changes to query optimizer
_optimizer_undo_cost_change21.1.0optimizer undo cost change
_optimizer_union_all_gsetsTRUEUse Union All Optimization for Grouping Sets
_optimizer_unnest_all_subqueriesTRUEenables unnesting of every type of subquery
_optimizer_unnest_corr_set_subqTRUEUnnesting of correlated set subqueries (TRUE/FALSE)
_optimizer_unnest_disjunctive_subqTRUEUnnesting of disjunctive subqueries (TRUE/FALSE)
_optimizer_unnest_scalar_sqTRUEenables unnesting of of scalar subquery
_optimizer_unnest_update_set_subqonenables unnesting of subquery in set for update
_optimizer_use_auto_indexesAUTOUse Auto Index
_optimizer_use_cbqt_star_transformationTRUEuse rewritten star transformation using cbqt framework
_optimizer_use_feedbackTRUEoptimizer use feedback
_optimizer_use_feedback_for_joinFALSEoptimizer use feedback for join
_optimizer_use_gtt_session_statsTRUEuse GTT session private statistics
_optimizer_use_histogramsTRUEenable/disable the usage of histograms by the optimizer
_optimizer_use_stats_modelsFALSEuse optimizer statistics extrapolation models
_optimizer_use_stats_on_conventional_config0settings for optimizer usage of online stats on conventional DML
_optimizer_use_stats_on_conventional_dmlFALSEuse optimizer statistics gathered for conventional DML
_optimizer_use_subheapTRUEEnables physical optimizer subheap
_optimizer_use_table_scanrateHADOOP_ONLYUse Table Specific Scan Rate
_optimizer_use_xt_rowidTRUEUse external table rowid
_optimizer_vector_base_dim_fact_factor200cost based vector transform base dimension to base fact ratio
_optimizer_vector_cost_adj100cost adjustment for vector aggregation processing estimates
_optimizer_vector_fact_dim_ratio10cost based vector transform dimension to fact ratio
_optimizer_vector_fact_payload_ratio20cost based vector transform payload dimension to fact ratio
_optimizer_vector_min_fact_rows10000000min number of rows required for vector aggregation transform
_optimizer_vector_transformationTRUEperform vector transform
_optimizer_wc_filter_pushdownTRUEenable/disable with clause filter predicate pushdown
_or_expand_nvl_predicateTRUEenable OR expanded plan for NVL/DECODE predicate
_oracle_employee_testingFALSESwitch on all features for the purpose of testing
_oracle_scriptFALSERunning an Oracle-supplied script
_oracle_script_counter0Helper parameter to set the value of _oracle_script counter
_oracle_special_license_1_grantedFALSEOracle internal parameter
_oradbg_pathnamepath of oradbg script
_oradebug_cmds_at_startuporadebug commands to execute at instance startup
_oradebug_forceFALSEforce target processes to execute oradebug commands?
_ordered_nested_loopTRUEenable ordered nested loop costing
_ordered_semijoinTRUEenable ordered semi-join subquery
_orph_cln_interval1200qmon periodic interval for removed subscriber messages cleanup
_os_sched_high_priority1OS high priority level
_os_sched_highest_priority1OS highest priority level
_oss_skgxp_udp_dynamic_credit_mgmtOSSLIB set dynamic credit for SKGXP-UDP
_other_wait_event_exclusionexclude event names from _other_wait_threshold calculations
_other_wait_threshold0threshold wait percentage for event wait class Other
_outline_bitmap_treeTRUEBITMAP_TREE hint enabled in outline
_override_datafile_encrypt_checkFALSEif TRUE, override datafile tablespace encryption cross check
_parallel_adaptive_max_users4maximum number of users running with default DOP
_parallel_blackbox_enabledTRUEparallel execution blackbox enabled
_parallel_blackbox_sgaTRUEtrue if blackbox will be allocated in SGA, false if PGA
_parallel_blackbox_size16384parallel execution blackbox bucket size
_parallel_broadcast_enabledTRUEenable broadcasting of small inputs to hash and sort merge joins
_parallel_cluster_cache_pct80max percentage of the global buffer cache to use for affinity
_parallel_cluster_cache_policyADAPTIVEpolicy used for parallel execution on cluster(ADAPTIVE/CACHED)
_parallel_conservative_queuingFALSEconservative parallel statement queuing
_parallel_ctas_enabledTRUEenable/disable parallel CTAS operation
_parallel_default_max_instances1default maximum number of instances for parallel query
_parallel_execution_message_alignFALSEAlignment of PX buffers to OS page boundary
_parallel_fake_class_pct0fake db-scheduler percent used for testing
_parallel_fault_tolerance_enabledFALSEenables or disables fault-tolerance for parallel statement
_parallel_fault_tolerance_threshold3total number of faults fault-tolerance will handle
_parallel_fixwrite_bucket1000Number of buckets for each round of fix write
_parallel_heartbeat_snapshot_interval2interval of snapshot to track px msging between instances
_parallel_heartbeat_snapshot_max128maximum number of historical snapshots archived
_parallel_inmemory_min_time_thresholdAUTOthreshold above which a plan is a candidate for parallelization for in-memory tables (in seconds)
_parallel_inmemory_time_unit1unit of work used to derive the degree of parallelism for in-memory tables (in seconds)
_parallel_lmd_reconfig1parallel lmd work in reconfiguration for enqueues.
_parallel_load_bal_unit0number of threads to allocate per instance
_parallel_load_balancingTRUEparallel execution load balanced slave allocation
_parallel_load_publish_threshold10diffrence in percentage controlling px load propagation
_parallel_log_write_cleanupFALSEPerform (null) log write cleanup in parallel
_parallel_min_message_pool491520minimum size of shared pool memory to reserve for pq servers
_parallel_optimization_phase_for_localFALSEparallel optimization phase when all slaves are local
_parallel_queuing_max_waitingtimeparallel statement queuing: max waiting time in queue
_parallel_recovery_stopat32767stop at -position- to step through SMON
_parallel_replay_msg_limit4000Number of messages for each round of parallel replay
_parallel_scalability50Parallel scalability criterion for parallel execution
_parallel_server_idle_time30000idle time before parallel query server dies (in 1/100 sec)
_parallel_server_sleep_time1sleep time between dequeue timeouts (in 1/100ths)
_parallel_slave_acquisition_wait1time(in seconds) to wait before retrying slave acquisition
_parallel_statement_queuingFALSEparallel statement queuing enabled
_parallel_syspls_obey_forceTRUETRUE to obey force parallel query/dml/ddl under System PL/SQL
_parallel_time_unit10unit of work used to derive the degree of parallelism (in seconds)
_parallel_txn_globalFALSEenable parallel_txn hint with updates and deletes
_parallelism_cost_fudge_factor350set the parallelism cost fudge factor
_parameter_spfile_syncFALSESPFILE sync mode
_parameter_table_block_size2048parameter table block size
_part_redef_global_index_updateTRUEonline partition redefinition update global indexes
_partial_comp_enabledTRUEpartial table compression enabled
_partial_log_preserve_spaceTRUEuse only required space for partial archive logs
_partial_pwise_join_enabledTRUEenable partial partition-wise join when TRUE
_partition_advisor_srs_activetrueenables sampling based partitioning validation
_partition_by_con_nameFALSEenable partitioning by con$name
_partition_cdb_view_enabledTRUEpartitioned cdb view evaluation enabled
_partition_large_extentsTRUEEnables large extent allocation for partitioned tables
_partition_read_onlyTRUEbypass all read only check for partition
_partition_view_enabledTRUEenable/disable partitioned views
_passwordfile_enqueue_timeout900password file enqueue timeout in seconds
_path_prefix_create_dirTRUECreate path in file system for CREATE DIRECTORY with PATH_PREFIX
_pbkdf2_sder_count3The PBKDF2 count to use for session key derivation
_pct_refresh_double_count_preventedTRUEmaterialized view PCT refreshes avoid double counting
_pdb_auto_save_stateFALSESave pdb state automatically on state change on a given instance
_pdb_auto_undots_create_offFALSEdisable automatic creation of undo tablespace in local undo mode
_pdb_char_set_intconvFALSEEnforce internal_convert for PDB character set conversion
_pdb_clone_preserve_guidFALSEUse same guid for a pdb clone
_pdb_cluster_databaseTRUEThis parameter can be turned-off when cluster_database is TRUE
_pdb_create_use_sysoper_connFALSEspread file copy slaves across instances
_pdb_datapatch_violation_restrictedTRUEOpen pdb in restricted mode for datapatch error violation
_pdb_failure_testing0Testing failure in pluggable database related operations
_pdb_file_copy_affinitizeFALSEspread file copy slaves across instances
_pdb_file_copy_buffers8number of buffers to use for pdb file copy
_pdb_first_scriptFALSERunning a script that is PDB-first/ROOT-last
_pdb_force_cfdFALSEForce DB_CREATE_FILE_DEST path for all datafiles in PDB
_pdb_hash_table_latches16number of PDB hash table latches
_pdb_hash_table_size255number of buckets in PDB hash table
_pdb_hybrid_read_onlyFALSEHybrid read only mode allows CDB common user to patch the PDB
_pdb_ignore_table_clausesTRUEIgnore subset of clauses in CREATE TABLE and ALTER TABLE
_pdb_inherit_cfdFALSEAutomatically enable CREATE_FILE_DEST clause in the PDB
_pdb_isolation_classNONEPDB isolation level: NONE, HIGH or MAX
_pdb_ktg_buffer_size16KTG buffer size (in KB) to store inmemory traces
_pdb_ldp_cascade0pluggable database lockdown profile cascade param
_pdb_lockdown_bypass_sr0special run lockdown parameter
_pdb_lockdown_ddl_clauses0pluggable database lockdown clauses for statements
_pdb_lrg_auto_undots_createFALSEenable automatic creation of undo tablespace in local undo mode
_pdb_mask_cdb_infoFALSEEnable masking CDB information within a PDB
_pdb_max_audit_size0Default value for MAX_AUDIT_SIZE property in new PDB creation
_pdb_max_diag_size0Default value for MAX_DIAG_SIZE property in new PDB creation
_pdb_max_size_discount10Discount percentable on PDB Max space usage
_pdb_name_case_sensitiveFALSEKeeps PDB name case sensitive
_pdb_oper_trace_threshold600PDB operations timing trace threshold
_pdb_oper_trace_threshold_softassertFALSEPDB operations timing threshold soft assert
_pdb_read_only_refreshFALSEallow refresh when pdb is open r/o
_pdb_refresh_apply_master_key_rekeyTRUEApply master rekey marker during pdb refresh
_pdb_refresh_use_dblink_to_catalogFALSEUse central catalog for pdb refresh
_pdb_refresh_use_local_logsTRUEUse local logs for pdb refresh
_pdb_seed_mcscFALSEAllow PDB SEED to have different character set than the CDB.
_pdb_service_on_root_listenerFALSEpdb services on CDB ROOT listeners
_pdb_small_table_threshold20lower threshold level of table size for direct reads in a pdb
_pdb_strict_plugin_compatFALSEPluggable database strict plugin compatibility
_pdb_transition_clean_bg_delay0delay in GEN0 to transition PDB to clean state
_pdb_use_sequence_cacheTRUEUse sequence cache in PDB mode
_pdb_vm_max_sizePDB SGA maximum virtual memory size
_pdml_gim_sampling5000control separation of global index maintenance for PDML
_pdml_gim_staggeredFALSEslaves start on different index when doing index maint
_pdml_slaves_diff_partTRUEslaves start on different partition when doing index maint
_percent_flashback_buf_partial_full50Percent of flashback buffer filled to be considered partial full
_pga_aggregate_xmem_limit0limit of aggregate PGA XMEM memory consumed by the instance
_pga_auto_snapshot_percentage20percent growth of PGA memory for additional snapshots
_pga_auto_snapshot_threshold524288000bytes of PGA memory in one process to trigger detail snapshot
_pga_in_sga_param1pga in sga param1
_pga_in_sga_param2pga in sga param2
_pga_in_sga_param3pga in sga param4
_pga_in_sga_param4pga in sga param4
_pga_in_sga_param5pga in sga param4
_pga_large_extent_size1048576PGA large extent size
_pga_limit_check_wait_time1000000microseconds to wait for over limit confirmation
_pga_limit_dump_summaryTRUEdump PGA summary when signalling ORA-4036
_pga_limit_interrupt_smallerFALSEwhether to interrupt smaller eligible processes
_pga_limit_min_req_size4194304bytes of PGA usage below which process will not get ORA-4036
_pga_limit_per_process_minimum3145728pga_aggregate_limit per-process minimum
_pga_limit_physmem_perc90default percent of physical memory for pga_aggregate_limit and SGA
_pga_limit_simulated_physmem_size0bytes of physical memory to determine pga_aggregate_limit with
_pga_limit_target_perc200default percent of pga_aggregate_target for pga_aggregate_limit
_pga_limit_time_to_interrupt2seconds to wait until direct interrupt
_pga_limit_time_until_idle15seconds to wait before treating process as idle
_pga_limit_time_until_killed30seconds to wait before killing session over limit
_pga_limit_tracing0trace pga_aggregate_limit activity
_pga_limit_use_immediate_killTRUEuse immediate kill for sessions over limit
_pga_limit_watch_perc50percentage of limit to have processes watch
_pga_limit_watch_size104857600bytes of PGA usage at which process will begin watching limit
_pga_max_size209715200Maximum size of the PGA memory for one process
_pgactx_cap_stacksFALSEcapture stacks for setting pgactx
_pin_time_statisticsFALSEif TRUE collect statistics for how long a current pin is held
_pivot_implementation_methodCHOOSEpivot implementation method
_pkt_enableFALSEenable progressive kill test
_pkt_pmon_interval50PMON process clean-up interval (cs)
_pkt_startFALSEstart progressive kill test instrumention
_plan_outline_dataTRUEexplain plan outline data enabled
_plan_verify_improvement_margin150Performance improvement criterion for evolving plan baselines
_plcmnt_template_svc_nameservice placement template name
_plsql_anon_block_code_typeINTERPRETEDPL/SQL anonymous block code-type
_plsql_cache_enableTRUEPL/SQL Function Cache Enabled
_plsql_dump_buffer_eventsconditions upon which the PL/SQL circular buffer is dumped
_plsql_icd_arg_dumpFALSEDump arguments to ICD
_plsql_max_stack_size0PL/SQL maximum stack size
_plsql_minimum_cache_hit_percent20plsql minimum cache hit percentage required to keep caching active
_plsql_native_frame_threshold4294967294Allocate PL/SQL native frames on the heap if size exceeds this value
_plsql_nvl_optimizeFALSEPL/SQL NVL optimize
_plsql_share_instantiationTRUEPL/SQL share kgscc for same SQL executed at multiple locations
_pluggable_database_debug0Debug flag for pluggable database related operations
_pmem_exchange_cold_victim_threshold0worthy touch count threshold for a victim buffer to be exchanged into pmem
_pmem_small_table_threshold20lower threshold of PMEM table size as percentage to PMEM cache for direct reads
_pmemfs_alloc_dataptrs1Set PMEMfs to preallocate inode tree
_pmemfs_enable_spacetrackingFALSEEnable PMEMfs Space Accounting Checks
_pmemfs_shrink_level0Enable pmemstore shrink
_pmemfs_smallfile_threshold1024Block count threshold for metedata
_pmon_cleanup_max_dfs100max dfs elements during cleanup
_pmon_dead_blkrs_alive_chk_rate_secs3rate to check blockers are alive during cleanup (in seconds)
_pmon_dead_blkrs_max_blkrs50max blockers to check during cleanup
_pmon_dead_blkrs_max_cleanup_attempts5max attempts per blocker while checking dead blockers
_pmon_dead_blkrs_scan_rate_secs3rate to scan for dead blockers during cleanup (in seconds)
_pmon_enable_dead_blkrsTRUElook for dead blockers during PMON cleanup
_pmon_exitnfy_enabledFALSEPMON Exit notification enabled
_pmon_idle_scan_interval60PMON idle scan interval (in seconds)
_pmon_incr_slaves3PMON cleanup: slave increment
_pmon_load_constants300,192,64,3,10,10,0,0server load balancing constants (S,P,D,I,L,C,M)
_pmon_max_consec_posts5PMON max consecutive posts in main loop
_pmon_max_slaves10Maximum number of PMON slaves
_pmon_min_slaves1Minimum number of PMON slaves
_pmon_new_slave_secs30PMON cleanup: new slave (in seconds)
_pmon_slave_stop_secs60PMON cleanup: slave stop limit (in seconds)
_pmon_slaves_arr_size160Array size for PMON slaves
_pmon_trees_per_slave10PMON cleanup: trees per slave
_posix_spawn_enabledTRUEposix_spawn enabled
_post_run_job_evaluationFALSEControl if jobs should evaluate at end of execution
_post_wait_queues_num_per_classPost Wait Queues - Num Per Class
_pq_numa_working_set_affinityTRUEif TRUE, enable pq slave NUMA affinity
_pqq_debug_txn_actFALSEpq queuing transaction active
_pqq_enabledTRUEEnable Resource Manager based Parallel Statement Queuing
_pqq_pdb_load_publish_threshold0difference in percentage controlling PDB load publish
_pre_rewrite_push_predTRUEpush predicates into views before rewrite
_precompute_gid_valuesTRUEprecompute gid values and copy them before returning a row
_pred_move_aroundTRUEenables predicate move-around
_pred_push_cdb_view_enabledTRUEpredicate pushdown enabled for CDB views
_predicate_elimination_enabledTRUEallow predicate elimination if set to TRUE
_predicate_validity_executionFALSEenable execution-time check for predicate validation
_prefer_local_tempFALSEUse Local Temp as preferred default tablespace
_prefered_standbystandby db_unique_name prefered for krb operations
_preplugin_backupenabledenable/disable pre-plugin backup feature
_prescommFALSEpresume commit of IMU transactions
_prespawn_batch_count20prespawn batch count
_prespawn_bg_init_count0prespawn background init count
_prespawn_enabledFALSEIs prespawn enabled
_prespawn_fg_init_count0prespawn foreground init count
_prespawn_min_count10prespawn minimum count
_print_inmem_heatmap0print inmem ilm heatmap
_print_inmem_srmap0print inmem spacereuse map
_print_refresh_schedulefalseenable dbms_output of materialized view refresh schedule
_print_stat_segment0print ilm statistics segment
_priv_for_set_current_schemaFALSEALTER SESSION privilege required for SET CURRENT_SCHEMA
_private_memory_addressStart address of large extent memory segment
_proc_grp_enabled3proc-group enabled
_proc_grp_numa_mapproc-group map string
_process_allocation_slots100process allocation slots
_process_heartbeat_range3Process heartbeat range
_process_max_pred_increase20000process SO max predicted increase
_process_percent_rampup_end320process SO percent rampup end
_process_percent_rampup_start320process SO percent rampup start
_process_prediction_failover_buffer1process prediction failover buffer
_process_save_predictionFALSEsave process prediction for next instance startup
_process_so_max_inc20000process SO max inc
_profile_sensitive_usersDatabase Users with restricted password profile
_project_view_columnsTRUEenable projecting out unreferenced columns of a view
_projection_pushdownTRUEprojection pushdown
_projection_pushdown_debug0level for projection pushdown debugging
_prop_old_enabledFALSEShift to pre 11g propagation behaviour
_propogate_restore_pointTRUEAllow shipping of restore point from primary to standby
_protect_frame_heapsFALSEProtect cursor frame heaps
_proxy_connect_after_set_containerTRUEEnable proxy connection after set container
_psdclog_enableFALSEMandatory Cloud Logging of PL/SQL Utility Packages Usages
_psdclog_threshold10Threshold for Cloud Logging of PL/SQL Utility Packages Usages
_pseudo_bootstrapFALSEIndicate that pseudo boostrap be done
_psr_optenable featureoptions for standby pdb recovery
_ptf_enable_objectsFALSEenable object types in PTF
_ptf_max_rows1024number of rows per row-buffer
_ptn_cache_threshold1flags and threshold to control partition metadata caching
_ptt_max_num16Maximum number of PTTs per session
_purge_idcs_access_tokenFALSEPurge IDCS Access Token
_push_join_predicateTRUEenable pushing join predicate inside a view
_push_join_union_viewTRUEenable pushing join predicate inside a union all view
_push_join_union_view2TRUEenable pushing join predicate inside a union view
_pwise_distinct_enabledTRUEenable partition wise distinct
_px_adaptive_dist_bypass_enabledTRUEenable the bypass table queue for adaptive distribution methods
_px_adaptive_dist_bypass_optimization1sets optimizations for bypass table queue for ADM
_px_adaptive_dist_methodCHOOSEdetermines the behavior of adaptive distribution methods
_px_adaptive_dist_method_threshold0Buffering / decision threshold for adaptive distribution methods
_px_adaptive_dist_nij_enabledONenable adaptive distribution methods for left non-inner joins
_px_adaptive_offload_percentage30percentage for PQ adaptive offloading of granules
_px_adaptive_offload_threshold10threshold (GB/s) for PQ adaptive offloading of granules
_px_autodop_pq_overheadTRUEadjust auto dop calculation using pq overhead
_px_back_to_parallelOFFallow going back to parallel after a serial operation
_px_bind_peek_sharingTRUEenables sharing of px cursors that were built using bind peeking
_px_broadcast_fudge_factor100set the tq broadcasting fudge factor percentage
_px_buffer_ttl30ttl for px mesg buffers in seconds
_px_cdb_view_enabledTRUEparallel cdb view evaluation enabled
_px_cdb_view_join_enabledTRUEdisable parallelism cap on CDB view
_px_chunk_size1000000default size of a chunk for row id granules (in KB)
_px_chunklist_count_ratio32ratio of the number of chunk lists to the default DOP per instance
_px_compilation_debug0debug level for parallel compilation
_px_compilation_trace0tracing level for parallel compilation
_px_concurrentTRUEenables pq with concurrent execution of serial inputs
_px_cpu_autodop_enabledTRUEenables or disables auto dop cpu computation
_px_cpu_operator_bandwidthCPU operator bandwidth in MB/sec for DOP computation
_px_cpu_process_bandwidth200CPU process bandwidth in MB/sec for DOP computation
_px_dist_agg_partial_rollup_pushdownADAPTIVEperform distinct agg partial rollup pushdown for px execution
_px_dp_array_size32767Max number of pq processes supported
_px_dump_12805_sourceTRUEenables or disables tracing of 12805 signal source
_px_dynamic_granulesTRUEenable dynamic granule generation
_px_dynamic_granules_adjust10adjust dynamic granule regeneration
_px_dynamic_optTRUEturn off/on restartable qerpx dynamic optimization
_px_dynamic_sample_size50num of samples for restartable qerpx dynamic optimization
_px_execution_services_enabledTRUEenable service-based constraint of px slave allocation
_px_extended_join_skew_handlingTRUEenables extended skew handling for parallel joins
_px_external_table_default_statsTRUEthe external table default stats collection enable/disable
_px_filter_parallelizedTRUEenables or disables correlated filter parallelization
_px_filter_skew_handlingTRUEenable correlated filter parallelization to handle skew
_px_freelist_latch_divisor2Divide the computed number of freelists by this power of 2
_px_gim_factor100weighted autodop global index maintenance factor
_px_granule_alignment1024default size of a rowid range granule (in KB)
_px_granule_batch_size26maximum size of a batch of granules
_px_granule_randomizeTRUEenables or disables randomization of parallel scans rowid granules
_px_granule_size1000000default size of a rowid range granule (in KB)
_px_groupby_pushdownFORCEperform group-by pushdown for parallel query
_px_hold_time0hold px at execution time (unit: second)
_px_hybrid_TSM_HWMB_loadTRUEEnable Hybrid Temp Segment Merge/High Water Mark Brokered load method
_px_hybrid_partition_execution_enabledTRUEenable parallel hybrid partition execution
_px_hybrid_partition_skew_threshold10partitions bigger than threshold times average size are skewed
_px_increase_join_frag_sizeTRUEincrease join message fragment size
_px_index_sampling_objsizeTRUEparallel query sampling for index create based on object size
_px_io_process_bandwidth200IO process bandwidth in MB/sec for computing DOP
_px_io_system_bandwidth0total IO system bandwidth in MB/sec for computing DOP
_px_join_skew_handlingTRUEenables skew handling for parallel joins
_px_join_skew_minfreq30sets minimum frequency(%) for skewed value for parallel joins
_px_join_skew_null_handlingTRUEenables null skew handling improvement for parallel outer joins
_px_join_skew_ratio10sets skew ratio for parallel joins
_px_join_skew_sampling_percent0Sets sampling percentage for skew handling sampling queries
_px_join_skew_sampling_time_limit50Sets execution time limit for skew handling sampling queries
_px_join_skew_use_histogramTRUEEnables retrieval of skewed values from histogram when possible
_px_join_skewed_values_count0force join skew handling with specified skewed values count
_px_kxib_tracing0turn on kxib tracing
_px_load_balancing_policyUNIFORMparallel load balancing policy
_px_load_factor300weighted autodop load factor
_px_load_monitor_threshold10000threshold for pushing information to load slave workload monitor
_px_load_publish_interval200interval at which LMON will check whether to publish PX load
_px_loc_msg_cost1000CPU cost to send a PX message via shared memory
_px_max_granules_per_slave100maximum number of rowid range granules to generate per slave
_px_max_map_val32Maximum value of rehash mapping for PX
_px_max_message_pool_pct40percentage of shared pool for px msg buffers range [5,90]
_px_message_compressionTRUEenable compression of control messages for parallel query
_px_min_granules_per_slave13minimum number of rowid range granules to generate per slave
_px_min_ndv_per_slave_perc_func2mininum NDV of TQ keys needed per slave for parallel percentile
_px_minus_intersectTRUEenables pq for minus/interect operators
_px_net_msg_cost10000CPU cost to send a PX message over the internconnect
_px_nlj_bcast_rr_threshold10threshold to use broadcast left random right distribution for NLJ
_px_no_granule_sortFALSEprevent parallel partition granules to be sorted on size
_px_no_stealingFALSEprevent parallel granule stealing in shared nothing environment
_px_nss_planbTRUEenables or disables NSS Plan B reparse with outline
_px_numa_stealing_enabledTRUEenable/disable PQ granule stealing across NUMA nodes
_px_numa_support_enabledFALSEenable/disable PQ NUMA support
_px_object_sampling200parallel query sampling for base objects (100000 = 100%)
_px_object_sampling_enabledTRUEuse base object sampling when possible for range distribution
_px_object_sampling_multiplier2number of samples to send to QC per slave is DOP * prmixsm
_px_onepass_slave_acquisitionTRUEenable/disable one pass slave acquisition for parallel execution
_px_oneslave_per_instance_parseTRUEsend parse to one slave per instance
_px_overhead_exec_ctrlmesg4pq overhead on sending one control message during execution (in microseconds)
_px_overhead_init_endpoints4pq overhead on setting up one end point during initialization (in microseconds)
_px_overhead_init_slavealloc1000pq overhead on allocating per slave during initialization (in microseconds)
_px_overhead_teardown600pq overhead on setting up one end point during initialization (in microseconds)
_px_parallel_spawn_min_count2PQ parallel spawn min threshold count
_px_parallelize_expressionTRUEenables or disables expression evaluation parallelization
_px_parallelize_non_native_datatypeTRUEenable parallelization for non-native datatypes
_px_partial_rollup_pushdownADAPTIVEperform partial rollup pushdown for parallel execution
_px_partition_load_dist_threshold64# of load slave to # of partition ratio to switch distribution
_px_partition_scan_enabledTRUEenables or disables parallel partition-based scan
_px_partition_scan_threshold64least number of partitions per slave to start partition-based scan
_px_partition_skew_threshold80percentage of table size considered as threshold for skew determination
_px_proactive_slave_alloc_threshold8parallel proactive slave allocation threshold/unit
_px_proc_constrainTRUEreduce parallel_max_servers if greater than (processes - fudge)
_px_pwg_enabledTRUEparallel partition wise group by enabled
_px_pwise_wif_enabledTRUEenable parallel partition wise window function
_px_pwmr_enabledTRUEparallel partition wise match recognize enabled
_px_replication_enabledTRUEenables or disables replication of small table scans
_px_reuse_server_groupsMULTIenable/disable reusing of server groups that are already acquired
_px_round_robin_rowcnt1000round robin row count to enq to next slave
_px_rownum_pdTRUEturn off/on parallel rownum pushdown optimization
_px_scalable_gby_invdistTRUEscalable PX plan for GBY w/ inverse distribution functions
_px_scalable_invdistTRUEenable/disable px scalable plan for inverse distribution functions
_px_scalable_invdist_mcolTRUEenable/disable px plan for percentile functions on multiple columns
_px_send_timeout300IPC message send timeout value in seconds
_px_shared_hash_joinFALSEenable/disable shared hash join
_px_single_server_enabledTRUEallow single-slave dfo in parallel query
_px_slave_parse_first_with_outline_hintsTRUEEnable/Disable trying outlined plan first
_px_split_batches_per_slave7number of split granules per slave for exadoop
_px_split_multi_msgTRUEuse multiple messages to send batch of split granules
_px_split_use_single_listTRUEuse single list for split granules
_px_tq_memcpy_threshold100threshold for PQ TQ to use memcpy for packing columns
_px_tq_rowhvsTRUEturn on intra-row hash valueing sharing in TQ
_px_tracenonepx trace parameter
_px_ual_serial_inputTRUEenables new pq for UNION operators
_px_wif_dfo_declumpingCHOOSENDV-aware DFO clumping of multiple window sorts
_px_wif_extend_distribution_keysTRUEextend TQ data redistribution keys for window functions
_px_wif_min_ndv_per_slave2mininum NDV of TQ keys needed per slave for scalable WiF PX
_px_xtgranule_size10000default size of a external table granule (in KB)
_qa_control0Oracle internal parameter to control QA
_qa_lrg_type0Oracle internal parameter to specify QA lrg type
_qesma_bo_lru_sz25size of base object LRU list for QESMA session cache
_qesma_mvob_lru_sz25size of MVOB LRU list for QESMA session cache
_qesmasc_trc0tracing for QESMA session cache
_qksfgi_disable_action_mask0disable fine-grained cursor invalidation actions
_qksfgi_disable_oct_mask0disable fine-grained cursor invalidation for certain oct
_qksfgi_dix_valFALSEcontrols action of fine-grained cursor invalidation for DROP INDEX
_qksfgi_dynamic_partitionsenable partition bind SQLIDs for
_qksfgi_feature_level0controls the feature level for fine-grained cursor invalidation
_qkslvc_47510_sys1enable project 47510 for internal users
_qkslvc_47510_test0enable project 47510 for testing
_qkslvc_extended_bind_sz1controls error checking for the max_string_size parameter
_quarantine_enabledTRUEquarantine: enable
_quarantine_max_mem1quarantine: max amount of memory
_quarantine_max_objs10000quarantine: max number of objects
_quarantine_per_hour60quarantine: limit per hour
_query_cost_rewriteTRUEperform the cost based rewrite with materialized views
_query_execution_cache_max_size131072max size of query execution cache
_query_execution_time_limit0Query execution time limit in seconds
_query_mmvrewrite_maxcmaps20query mmv rewrite maximum number of cmaps per dmap in query disjunct
_query_mmvrewrite_maxdmaps10query mmv rewrite maximum number of dmaps per query disjunct
_query_mmvrewrite_maxinlists5query mmv rewrite maximum number of in-lists per disjunct
_query_mmvrewrite_maxintervals5query mmv rewrite maximum number of intervals per disjunct
_query_mmvrewrite_maxpreds10query mmv rewrite maximum number of predicates per disjunct
_query_mmvrewrite_maxqryinlistvals500query mmv rewrite maximum number of query in-list values
_query_mmvrewrite_maxregperm512query mmv rewrite maximum number of region permutations
_query_on_physicalTRUEquery on physical
_query_rewrite_1TRUEperform query rewrite before&after or only before view merging
_query_rewrite_2TRUEperform query rewrite before&after or only after view merging
_query_rewrite_drjFALSEmv rewrite and drop redundant joins
_query_rewrite_expressionTRUErewrite with cannonical form for expressions
_query_rewrite_fpcTRUEmv rewrite fresh partition containment
_query_rewrite_fudge90cost based query rewrite with MVs fudge factor
_query_rewrite_jgmigrateTRUEmv rewrite with jg migration
_query_rewrite_maxdisjunct257query rewrite max disjuncts
_query_rewrite_or_errorFALSEallow query rewrite, if referenced tables are not dataless
_query_rewrite_setopgrw_enableTRUEperform general rewrite using set operator summaries
_query_rewrite_use_on_query_computationTRUEquery rewrite use on query computation
_query_rewrite_vop_cleanupTRUEprune frocol chain before rewrite after view-merging
_queue_buffer_max_dump_len65536max number of bytes to dump to trace file for queue buffer dump
_rac_dbtype_resetFALSERAC database type reset from CRS
_rac_propagate_last_rbaTRUEPropagate last written log redo address in RAC for log mining
_radm_enabledTRUEData Redaction
_rbr_ckpt_tracing0Enable reuse block range checkpoint tracing
_rc_sys_obj_enabledTRUEresult cache enabled for Sys Objects
_rcfg_disable_verifyTRUEif TRUE disables verify at reconfiguration
_rcfg_parallel_fixwriteTRUEif TRUE enables parallel fixwrite at reconfiguration
_rcfg_parallel_replayTRUEif TRUE enables parallel replay and cleanup at reconfiguration
_rcfg_parallel_verifyFALSEif TRUE enables parallel verify at reconfiguration
_rdbms_compatibility10.1default RDBMS compatibility level
_rdbms_internal_fplib_enabledFALSEenable CELL FPLIB filtering within rdbms
_rdbms_internal_fplib_raise_errorsFALSEenable reraising of any exceptions in CELL FPLIB
_re_fast_sql_operatorallenables fast boxable sql operator
_re_independent_expression_cache_size20defines max number of compiled cached expressions for iee
_re_num_complex_operator1000defines max number of compiled complex operator per ruleset-iee
_re_num_rowcache_load2defines max number of complex operators loaded with row cache
_re_result_cache_keysiz20defines max number key for result cache hash table
_re_result_cache_size20defines max number of cached elements for result cache
_read_mostly_enable_logonFALSERead mostly/ Read only instances enable non-privileged logons
_read_mostly_instanceFALSEindicates this is a read_mostly instance
_read_mostly_instance_qa_control0internal parameter to control read mostly instance QA
_read_mostly_lock_mitigationTRUERead Mostly Lock mitigation support
_read_mostly_slave_timeout20Time to wait on read mostly node when hub not available
_read_only_slave_timeout30Time to wait on read only node when hub not available
_read_only_violation_dump_to_traceFALSEread-only violation dump to trace files
_read_only_violation_max_count500read-only violation array max count
_read_only_violation_max_count_per_module100read-only violation array per module max count
_read_optimized_table_lookupTRUEenables read-optimized table lookup
_readable_standby_sync_interval0readable standby recovery global sync interval
_readable_standby_sync_timeout10readable standby query scn sync timeout
_reader_farm_isolation_enableFALSEReader Farm instances isolation enable
_reader_farm_isolation_time_threshold200reader farm isolation time threshold
_real_time_apply_sim0Simulation value with real time apply
_realfree_heap_max_size32768minimum max total heap size, in Kbytes
_realfree_heap_mode0mode flags for real-free heap
_realfree_heap_pagesize65536hint for real-free page size in bytes
_realfree_pq_heap_pagesize65536hint for pq real-free page size in bytes
_reclaim_lob_index_scan_limit0limit lob index scanning during lob space-reclaim
_reco_sessions_max_percentage50allowed RECO sessions as a percentage of total sessions allowed
_reconfiguration_opt_level237reconfiguration optimization level
_record_module_nameTRUERecord module name in BEGIN action
_recoverable_recovery_batch_percent50Recoverable recovery batch size (percentage of buffer cache)
_recoverable_recovery_max_influx_buffers100000Recoverable recovery number of influx buffers limit
_recovery_assertsFALSEif TRUE, enable expensive integrity checks
_recovery_percentage50recovery buffer cache percentage
_recovery_read_limit1024number of recovery reads which can be outstanding
_recovery_skip_cfseq_checkFALSEallow media recovery even if controlfile seq check fails
_recovery_verify_writesFALSEenable thread recovery write verify
_recursive_imu_transactionsFALSErecursive transactions may be IMU
_recursive_with_branch_iterations7Expected number of iterations of the recurive branch of RW/CBY
_recursive_with_control0control different uses/algorithms related to recursive with
_recursive_with_max_recursion_level0check for maximum level of recursion instead of checking for cycles
_recursive_with_parallelTRUEEnable/disable parallelization of Recursive With
_recursive_with_using_temp_tableFALSEEnable the use of CDT for serial execution of Recursive With
_redef_on_statementFALSEUse on-statement refresh in online redefinition
_redo_compatibility_checkFALSEgeneral and redo/undo compatibility sanity check
_redo_log_check_backup10time interval in minutes between wakeups to check backup of redo logs
_redo_log_debug_config0Various configuration flags for debugging redo logs
_redo_log_key_reuse_count0Determines the number of redo logs sharing the same redo log key
_redo_log_record_life168Life time in hours for redo log table records
_redo_read_from_memoryTRUEEnable reading redo from in-memory log buffer
_redo_transport_async_mode0redo transport ASYNC process mode
_redo_transport_catch_up_bandwidth_percentage50redo transport catch up bandwitdth percent
_redo_transport_compress_allTRUEIs ASYNC LNS compression allowed?
_redo_transport_evict_threshold10Threshold beyond which a slower ASYNC connection will be evicted
_redo_transport_max_kbytes_sec0redo transport maximum KB/s
_redo_transport_min_kbytes_sec10redo transport minimum KB/s
_redo_transport_redo_log_managementredo log management
_redo_transport_resource_managementFALSERedo transport resource management
_redo_transport_sanity_check0redo transport sanity check bit mask
_redo_transport_stall_time360use parameter DATA_GUARD_MAX_IO_TIME
_redo_transport_stall_time_long3600use parameter DATA_GUARD_MAX_LONGIO_TIME
_redo_transport_stream_testTRUEtest stream connection?
_redo_transport_stream_writesTRUEStream network writes?
_redo_transport_vio_size_req1048576VIO size requirement
_redo_write_coalesce_all_threshold0Redo write coalescing threshold (all strands) in bytes
_redo_write_coalesce_slave_threshold0Redo write coalescing threshold (slave strands) in bytes
_redo_write_sync_single_ioTRUEenable sync I/O for single redo write
_reduce_sby_log_scanTRUEenable standby log scan optimization
_ref_cons_sql_enforcementTRUEdisable extended/data ref constraint SQL enforcement
_reg_cache_statusFALSEEnables or disabled caching
_region_namegsm region name
_release_insert_threshold5maximum number of unusable blocks to unlink from freelist
_reliable_block_sendsTRUEif TRUE, no side channel on reliable interconnect
_relocate_pdbFALSERelocate PDB to another RAC instance after it is closed in the current instance
_relocation_commit_batch_size8ASM relocation commit batch size
_remessage_dbwrs0DBWR wait and remessage time - in cs
_remote_asmremote ASM configuration
_remote_awr_enabledFALSEEnable/disable Remote AWR Mode
_remote_http_port0HTTP port number registered with remote listener
_remove_aggr_subqueryTRUEenables removal of subsumed aggregated subquery
_remove_exf_componentTRUEenable/disable removing of components EXF and RUL during upgrade
_rep_base_pathbase path for EM reports in database
_replace_virtual_columnsTRUEreplace expressions with virtual columns
_report_capture_cycle_time60Time (in sec) between two cycles of report capture daemon
_report_capture_dbtime_percent_cutoff50100X Percent of system db time daemon is allowed over 10 cycles
_report_capture_recharge_window10No of report capture cycles after which db time is recharged
_report_capture_timeband_length1Length of time band (in hours) in the reports time bands table
_report_request_ageout_minutes60Time (in min) after which a report request is deleted from queue
_request_boundaries3request boundaries mode
_reset_increase_lmd_processTRUEset to true to allow reset of _increase_lmd_process changes
_reset_increase_lms_processTRUEset to true to allow reset of _increase_lms_process changes
_resource_includes_unlimited_tablespaceFALSEWhether RESOURCE role includes UNLIMITED TABLESPACE privilege
_resource_manager_always_offFALSEdisable the resource manager always
_resource_manager_planresource mgr top plan for internal use
_restore_block0onrestore block0
_restore_create_directoryTRUEautomatically create directory during restore
_restore_maxopenfiles8restore assumption for maxopenfiles
_restore_spfilerestore spfile to this location
_restrict_become_userTRUEbecome user functionality restricted
_restrict_db_link_user_entries10000Maximum number of entries per db link user
_restrict_local_user_dmlTRUERestrict Local user's ability to update sensitive tables
_restrict_pdb_gvFALSErestrict GV$ in a PDB
_result_cache_auto_dml_monitoring_duration15result cache auto dml monitoring duration
_result_cache_auto_dml_monitoring_slots4result cache auto dml monitoring slot
_result_cache_auto_dml_threshold16result cache auto dml threshold
_result_cache_auto_dml_trend_threshold20result cache auto dml trend threshold
_result_cache_auto_execution_threshold1result cache auto execution threshold
_result_cache_auto_size_threshold100result cache auto max size allowed
_result_cache_auto_time_distance300result cache auto time distance
_result_cache_auto_time_threshold1000result cache auto time threshold
_result_cache_black_listcache_id's not allowed to use the result cache
_result_cache_block_size4096result cache block size
_result_cache_copy_block_count1blocks to copy instead of pinning the result
_result_cache_deterministic_plsqlFALSEresult cache deterministic PLSQL functions
_result_cache_do_recycle_period300Timeout value for DOs added through invalidation
_result_cache_globalTRUEAre results available globally across RAC?
_result_cache_global_sendTRUEIs global send conditional in RAC?
_result_cache_history_size0memory used to track PL/SQL function history
_result_cache_latch_count4number of result cache latches
_result_cache_latch_free_readsADMINlatch free reads
_result_cache_load_rate1Simulated global load rate (bytes per 1/100 sec)
_result_cache_object_black_list0object numbers not allowed to use the result cache
_result_cache_per_pdbTRUEIs service result cache per pdb
_result_cache_timeout1maximum time (sec) a session waits for a result
_result_cache_use_hash_tableTRUEwhether to use hash table for object tracking
_result_cache_white_listusers allowed to use result cache
_resumable_critical_alert0raise critical alert for resumable failure
_reuse_dropped_pdbid_time180Time in seconds to wait before reusing a dropped PDB ID
_reuse_index_loop5number of blocks being examine for index block reuse
_rf_blocks_per_entity5number of blocks per entity
_right_outer_hash_enableTRUERight Outer/Semi/Anti Hash Enabled
_rm_atp_cpu_cnt_scale1Scaling factor for cpu count in ATP
_rm_cluster_interconnectsinterconnects for RAC use (RM)
_rm_exadata_partition_fcFALSEPartition flash cache for Exadata
_rm_exadata_pdb_cpu_cntFALSEUse PDB CPU cnt for Exadata smart scan
_rm_exadata_pdb_cpu_cnt_mult2Multiplication factor for PDB cpu count
_rm_force_cagingFALSE
_rm_numa_sched_enableTRUEIs Resource Manager (RM) related NUMA scheduled policy enabled
_rm_numa_simulation_cpus0number of cpus for each pg for numa simulation in resource manager
_rm_numa_simulation_pgs0number of PGs for numa simulation in resource manager
_rm_superlong_threshold300000DBRM kskrunstatechk superlong threshold
_rman_io_priority3priority at which rman backup i/o's are done
_rman_roundrobin_placementNuma round robin placement for RMAN procs
_rmt_for_table_redef_enabledTRUEUse Rowid Mapping Table for table redef
_rmv_dynamic_priorityTRUEenable rmv priority modification
_roi_first_open_wait120duration of ROI first open wait for RWI open
_rollback_segment_count0number of undo segments
_rollback_segment_initial1starting undo segment number
_rollback_stopat0stop at -position to step rollback
_rolling_patchlevelSet Rolling Patch Level for RDBMS instance
_rond_test_mode0rac one node test mode
_root_clone_skip_triggerTRUESkip trigger in Application Root Clone
_root_clone_state_from_rootTRUEApplication Root Clone's state comes from Application Root
_row_cache_cursors20number of cached cursors for row cache management
_row_cache_dump_cooling_period10Period to wait (in minutes) before resetting dump count
_row_cache_dump_interval0Interval (in seconds) between each dump
_row_crTRUEenable row cr for all sql
_row_lockingalwaysrow-locking
_row_shipping_explainFALSEenable row shipping explain plan support
_row_shipping_threshold100row shipping column selection threshold
_rowlen_for_chaining_threshold1000maximum rowlen above which rows may be chained across blocks
_rowsets_cdb_view_enabledTRUErowsets enabled for CDB views
_rowsets_enabledTRUEenable/disable rowsets
_rowsets_max_enc_rows64maximum number of encoded rows in a rowset
_rowsets_max_rows256maximum number of rows in a rowset
_rowsets_target_maxsize524288target size in bytes for space reserved in the frame for a rowset
_rowsets_use_encodingTRUEallow/disallow use of encoding with rowsets
_rowsource_execution_statisticsFALSEif TRUE, Oracle will collect rowsource statistics
_rowsource_profiling_statisticsTRUEif TRUE, Oracle will capture active row sources in v$active_session_history
_rowsource_statistics_sampfreq128frequency of rowsource statistic sampling (must be a power of 2)
_rowsrc_trace_level0Row source tree tracing level
_rq_shm_max_size1024maximum size of an RQuery shared memory segement (in KB)
_rsrc_cpu_count0CPU Count for allocating resources.
_rta_sync_wait_timeout10RTA sync wait timeout
_rtabnd_update_offloadTRUERFS process offload RTA boundary update
_rtaddm_trigger_argscomma-separated list of numeric arguments for RT addm trigger
_rtaddm_trigger_enabledTRUETo enable or disable Real-Time ADDM automatic trigger
_rtc_infeasible_threshold25Redo Transport Compression infeasible threshold
_rule_max_dnfp_cnt1024Rules max dnf piece count
_runtime_index_key_length_check0allow runtime checking of index key length
_runtime_limit_parallel_fptr60run-time limit for for parallel first-pass recovery
_sage_block_checkingFALSEenable block checking of blocks returned by smartscan
_sample_rows_per_block4number of rows per block used for sampling IO optimization
_save_afns_on_subset_pdb_creationFALSEUse one reserved AFN for skipped tablespaces on pdb subset creation with lower compat
_scalar_type_lob_storage_threshold4000threshold for VARCHAR2, NVARCHAR2, and RAW storage as BLOB
_scatter_gcs_resourcesFALSEif TRUE, gcs resources are scattered uniformly across sub pools
_scatter_gcs_shadowsFALSEif TRUE, gcs shadows are scattered uniformly across sub pools
_sched_delay_max_samples4scheduling delay maximum number of samples
_sched_delay_measurement_sleep_us1000scheduling delay mesurement sleep us
_sched_delay_os_tick_granularity_us16000os tick granularity used by scheduling delay calculations
_sched_delay_sample_collection_thresh_ms200scheduling delay sample collection duration threshold ms
_sched_delay_sample_interval_ms1000scheduling delay sampling interval in ms
_scn_wait_interface_max_backoff_time_secs600max exponential backoff time for scn wait interface in kta
_scn_wait_interface_max_timeout_secs2147483647max timeout for scn wait interface in kta
_sdiag_crashNONEsql diag crash
_sec_enable_test_rpcsFALSEWhether to enable the test RPCs
_second_spare_pdb_parametersecond spare pdb parameter - integer
_securefile_log_num_latches0Maximum number of open descriptors for securefile log
_securefile_log_shared_pool_size0Size of securefile log buffer pool from SGA
_securefile_shrink_enable_nowaitlckFALSEEnable Securefile Shrink NOWAIT row locking
_securefile_shrink_hash_table_limit100Size limit on Securefile Lob Shrink state Hash table
_securefile_timersFALSEcollect kdlu timers and accumulate per layers
_securefiles_bgtimeout0securefiles segment background invocation timeout
_securefiles_breakreten_retry5segment retry before dishonoring retention
_securefiles_bulkclnoutTRUEsecurefiles segment bulk clnout optization
_securefiles_bulkinsertFALSEsecurefiles segment insert only optization
_securefiles_concurrency_estimate12securefiles concurrency estimate
_securefiles_dealloc_cfs0securefiles deallocate directly to CFS
_securefiles_fg_retry100segment retry before foreground waits
_securefiles_forceflushFALSEsecurefiles force flush before allocation
_securefiles_memory_percentofSGA8securefiles memory as percent of SGA
_securefiles_spcutlFALSEsecurefiles segment utl optimization
_seed_root_undo_ratio30Ratio of PDB$SEED to ROOT undo size, expressed as a percentage
_selectivity_for_srf_enabledFALSEenable/disable selectivity for storage reduction factor
_selfjoin_mv_duplicatesTRUEcontrol rewrite self-join algorithm
_selftune_checkpoint_write_pct3Percentage of total physical i/os for self-tune ckpt
_selftune_checkpointing_lag300Self-tune checkpointing lag the tail of the redo log
_sem_per_semidthe exact number of semaphores per semaphore set to allocate
_send_ast_to_foregroundAUTOif TRUE, send ast message to foreground
_send_close_with_blockTRUEif TRUE, send close with block even with direct sends
_send_requests_to_piTRUEif TRUE, try to send CR requests to PI buffers
_sensitive_common_as_localFALSEtreat common user as local user for sensitive data handling
_sensitive_common_userslist of common users to be treated as local
_sequence_scale_extendFALSEForce sequence creation with scale extend
_sequence_scale_noextendFALSEForce sequence creation with scale noextend
_serial_direct_readautoenable direct read in serial
_serial_log_write_worker_ioFALSESerialize log write worker I/O
_serial_recoveryFALSEforce serial recovery or parallel recovery
_serializableFALSEserializable
_serialize_lgwr_sync_ioFALSESerialize LGWR SYNC local and remote io
_service_cleanup_timeout30timeout to peform service cleanup
_sess_sign_num_pools16session signature: number of pools
_sess_template_all_overflowFALSEsession template: put all attributes into overflow
_sess_template_cache_buckets128session template: number of cache buckets
_sess_template_enabledTRUEsession template: enabled
_sess_template_max_cache_size5session template: max cache size (in 1/100% of SGA)
_sess_template_new_lists16session template: number of new lists
_sess_template_purge_time_mins60session template: purge time (in minutes)
_sess_template_sparesTRUEsession template: spares
_session_allocation_latches4one latch per group of sessions
_session_aware_replayTRUEEnable session aware replay
_session_cached_instantiations60Number of pl/sql instantiations to cache in a session.
_session_context_size10000session app context size
_session_idle_bit_latches0one latch per session or a latch per group of sessions
_session_limit_percent_cap25session limit percent cap
_session_max_pred_increase20000session SO max predicted increase
_session_modp_list2send session's modified parameter list to client
_session_page_extent2048Session Page Extent Size
_session_percent_rampup_end504session SO percent rampup end
_session_percent_rampup_start504session SO percent rampup start
_session_prediction_failover_buffer1session prediction failover buffer
_session_save_predictionFALSEsave session prediction for next instance startup
_session_so_max_inc20000session SO max inc
_session_wait_history10enable session wait history collection
_set_container_serviceDEFAULTset container service
_seventeenth_spare_parameterseventeenth spare parameter - integer
_seventeenth_spare_pdb_parameterseventeenth spare pdb parameter - integer
_seventh_spare_pdb_parameterseventh spare pdb parameter - integer
_seventieth_spare_parameterseventieth spare parameter - integer
_seventieth_spare_pdb_parameterseventieth spare pdb parameter - boolean
_seventy-eighth_spare_parameterseventy-eighth spare parameter - integer
_seventy-fifth_spare_parameterseventy-fifth spare parameter - integer
_seventy-first_spare_parameterseventy-first spare parameter - integer
_seventy-fourth_spare_parameterseventy-fourth spare parameter - integer
_seventy-ninth_spare_parameterseventy-ninth spare parameter - integer
_seventy-second_spare_parameterseventy-second spare parameter - integer
_seventy-seventh_spare_parameterseventy-seventh spare parameter - integer
_seventy-sixth_spare_parameterseventy-sixth spare parameter - integer
_seventy-third_spare_parameterseventy-third spare parameter - integer
_sf_default_enabledTRUEenable 12g securefile default
_sga_alloc_slaves_term_timeout_secs120Termination timeout in secs for SA** slaves
_sga_clear_dumpFALSEAllow dumping encrypted blocks in clear for debugging
_sga_early_trace0sga early trace event
_sga_grow_batch_size2147483648Dynamic SGA grow batch size
_sga_heap_chunk_alignmentFALSEforce SGA heap chunk alignment
_sga_heap_chunk_alignment_disabledFALSEforce SGA heap chunks not to be aligned
_sga_shrink_allowFALSEAllow SGA shrink operation
_shadow_lost_write_found118Specify shadow lost write error handling
_shadow_lost_write_tracing0Enable new lost write tracing
_shard_ddl_policyASYNCDDL execution mode for shards
_shard_sesscache_cnt0enable session caching for shard SQL
_shard_sql_use_chunk_ids0Shard SQL use chunk ids
_shardgroup_namegsm shardgroup name
_shardspace_namegsm shardspace name
_share_drcp_proxy_sessionsTRUEEnable Disable Proxy Session Sharing DRCP
_shared_io_pool_buf_size1048576Shared IO pool buffer size
_shared_io_pool_debug_trc0trace kcbi debug info to tracefile
_shared_io_pool_size117440512Size of shared IO pool
_shared_io_set_valueFALSEshared io pool size set internal value - overwrite zero user size
_shared_iop_max_size134217728maximum shared io pool size
_shared_pool_max_size0shared pool maximum size when auto SGA enabled
_shared_pool_max_sz0
_shared_pool_minsize_onFALSEshared pool minimum size when auto SGA enabled
_shared_pool_reserved_min_alloc4400minimum allocation size in bytes for reserved area of shared pool
_shared_pool_reserved_pct5percentage memory of the shared pool allocated for the reserved area
_shared_server_load_balance0shared server load balance
_shared_server_num_queues2number of shared server common queues
_shared_server_sizing_coeff1000Shared server sizing coefficient
_shared_servers_performance0Tradeoff shared servers resource usage for performance
_shd_atomic_move0Use atomic move
_shd_reptype0replication type of the databse and pool
_shmprotect0allow mprotect use for shared memory
_short_stack_timeout_ms30000short stack timeout in ms
_show_login_pdb_sessionsFALSEreturn logon pdb container id from v$session
_shrd_que_tm_processes1number of sharded queue Time Managers to start
_shrd_que_tm_statistics_duration0Shaded queue statistics collection window duration
_shrunk_aggs_disable_threshold60percentage of exceptions at which to switch to full length aggs
_shrunk_aggs_enabledTRUEenable use of variable sized buffers for non-distinct aggregates
_shutdown_completion_timeout_mins60minutes for shutdown operation to wait for sessions to complete
_shutdown_sync_enableTRUEif TRUE, shutdown sync is issued before shutdown normal
_side_channel_batch_size240number of messages to batch in a side channel message (DFS)
_side_channel_batch_timeout6timeout before shipping out the batched side channelmessages in seconds
_side_channel_batch_timeout_ms500timeout before shipping out the batched side channelmessages in milliseconds
_simple_view_mergingTRUEcontrol simple view merging performed by the optimizer
_simulate_dax_storageDISABLESimulate log on DAX storage
_simulate_disk_sectorsize0Enables skgfr to report simulated physical disk sector size
_simulate_io_wait0Simulate I/O wait to test segment advisor
_simulate_logical_sectorsize0Enables skgfr to report simulated logical disk sector size
_simulate_mem_transferFALSEsimulate auto memory sga/pga transfers
_simulated_log_write_usecs0Simulated latency of log writes (usecs)
_simulator_bucket_mindelta8192LRU bucket minimum delta
_simulator_internal_bound10simulator internal bound percent
_simulator_lru_rebalance_sizthr5LRU list rebalance threshold (size)
_simulator_lru_rebalance_thresh10240LRU list rebalance threshold (count)
_simulator_lru_scan_count8LRU scan count
_simulator_pin_inval_maxcnt16maximum count of invalid chunks on pin list
_simulator_reserved_heap_count4096simulator reserved heap count
_simulator_reserved_obj_count1024simulator reserved object count
_simulator_sampling_factor2sampling factor for the simulator
_simulator_upper_bound_multiple2upper bound multiple of pool size
_single_processFALSErun without detached processes
_singleton_service_goodness_disabledTRUEsingleton srvc goodness
_siop_flashback_scandepth20Shared IO pool flashback io completion scan depth
_siop_init_mem_graduallyTRUEwill cause shared io pool in small chunks
_siop_perc_of_bc_x100625percentange * 100 of cache to transfer to shared io pool
_sixteenth_spare_parametersixteenth spare parameter - integer
_sixteenth_spare_pdb_parametersixteenth spare pdb parameter - integer
_sixth_spare_pdb_parametersixth spare pdb parameter - integer
_sixtieth_spare_parametersixtieth spare parameter - integer
_sixtieth_spare_pdb_parametersixtieth spare pdb parameter - boolean
_sixty-eighth_spare_parametersixty-eighth spare parameter - integer
_sixty-eighth_spare_pdb_parametersixty-eighth spare pdb parameter - boolean
_sixty-fifth_spare_parametersixty-fifth spare parameter - integer
_sixty-fifth_spare_pdb_parametersixty-fifth spare pdb parameter - boolean
_sixty-first_spare_parametersixty-first spare parameter - integer
_sixty-first_spare_pdb_parametersixty-first spare pdb parameter - boolean
_sixty-fourth_spare_parametersixty-fourth spare parameter - integer
_sixty-fourth_spare_pdb_parametersixty-fourth spare pdb parameter - boolean
_sixty-ninth_spare_parametersixty-ninth spare parameter - integer
_sixty-ninth_spare_pdb_parametersixty-ninth spare pdb parameter - boolean
_sixty-second_spare_parametersixty-second spare parameter - integer
_sixty-second_spare_pdb_parametersixty-second spare pdb parameter - boolean
_sixty-seventh_spare_parametersixty-seventh spare parameter - integer
_sixty-seventh_spare_pdb_parametersixty-seventh spare pdb parameter - boolean
_sixty-sixth_spare_parametersixty-sixth spare parameter - integer
_sixty-sixth_spare_pdb_parametersixty-sixth spare pdb parameter - boolean
_sixty-third_spare_parametersixty-third spare parameter - integer
_sixty-third_spare_pdb_parametersixty-third spare pdb parameter - boolean
_size_of_log_table100modifying this hidden parameter, will modify the sizeof the v$gcr_log table
_skgxp_ant_optionsSKGXP ANT options (oss)
_skgxp_ctx_flags10IPC debug options flags (oss)
_skgxp_ctx_flags1mask0IPC debug options flags mask (oss)
_skgxp_dynamic_protocol0IPC protocol override (!0/-1=*,2=UDP,3=RDS,0x1000=ipc_X)
_skgxp_gen_ant_off_rpc_timeout_in_sec30VRPC request timeout when ANT disabled
_skgxp_gen_ant_ping_misscount3ANT protocol ping miss count
_skgxp_gen_rpc_no_path_check_in_sec5ANT ping protocol miss count
_skgxp_gen_rpc_timeout_in_sec300VRPC request timeout when ANT enabled
_skgxp_inetslimit SKGXP networks (oss)
_skgxp_min_rpc_rcv_zcpy_len0IPC threshold for rpc rcv zcpy operation (default = 0 - disabled)
_skgxp_min_zcpy_len0IPC threshold for zcpy operation (default = 0 - disabled)
_skgxp_reaping1000tune skgxp OSD reaping limit
_skgxp_rgn_ports0region socket limits (0xFFFFNNXX): F=flags, N=min, X=max
_skgxp_spare_param1ipc oss spare parameter 1
_skgxp_spare_param2ipc oss spare parameter 2
_skgxp_spare_param3ipc oss spare parameter 3
_skgxp_spare_param4ipc oss spare parameter 4
_skgxp_spare_param5ipc oss spare parameter 5
_skgxp_udp_ach_reaping_time120time in minutes before idle ach's are reaped
_skgxp_udp_ack_delay0Enables delayed acks
_skgxp_udp_enable_dynamic_credit_mgmt0Enables dynamic credit management
_skgxp_udp_hiwat_warn1000ach hiwat mark warning interval
_skgxp_udp_interface_detection_time_secs60time in seconds between interface detection checks
_skgxp_udp_keep_alive_ping_timer_secs300connection idle time in seconds before keep alive is initiated. min: 30 sec max: 1800 sec default: 300 sec
_skgxp_udp_lmp_mtusize0MTU size for UDP LMP testing
_skgxp_udp_lmp_onFALSEenable UDP long message protection
_skgxp_udp_timed_wait_buffering1024diagnostic log buffering space (in bytes) for timed wait (0 means unbufferd
_skgxp_udp_timed_wait_seconds5time in seconds before timed wait is invoked
_skgxp_udp_use_tcbTRUEdisable use of high speek timer
_skgxp_zcpy_flags0IPC zcpy options flags
_skgxpg_last_parameter27last defined skgxpg parameter - oss
_skip_acfs_checksFALSEOverride checking if on an ACFS file system
_skip_app_object_checkFALSESkip application object checks
_skip_app_unconverted_checkFALSESkip application unconverted check
_skip_assume_msgTRUEif TRUE, skip assume message for consigns at the master
_skip_oradism_checkFALSESwitch on all features for the purpose of testing
_skip_pdb_recovery_if_keystore_not_openFALSESkip PDB recovery when the PDB's keystore is not open
_skip_pset_col_chk0skip validation of partition set keys in DML
_skip_sequence_cache_close_immediateFALSESkip sequence cache flush on pdb shutdown immediate
_skip_trstamp_checkTRUESkip terminal recovery stamp check
_skip_unconverted_change_vectorFALSESkip apply of a CV that has no endian conversion function
_slave_mapping_enabledTRUEenable slave mapping when TRUE
_slave_mapping_group_size0force the number of slave group in a slave mapper
_slave_mapping_skew_ratio2maximum skew before slave mapping is disabled
_slow_kill_on_pdb_close_immediateFALSEKill sessions periodically on pdb close immediate
_small_table_threshold2623lower threshold level of table size for direct reads
_smm_advice_enabledTRUEif TRUE, enable v$pga_advice
_smm_advice_log_size0overwrites default size of the PGA advice workarea history log
_smm_auto_cost_enabledTRUEif TRUE, use the AUTO size policy cost functions
_smm_auto_max_io_size248Maximum IO size (in KB) used by sort/hash-join in auto mode
_smm_auto_min_io_size56Minimum IO size (in KB) used by sort/hash-join in auto mode
_smm_bound0overwrites memory manager automatically computed bound
_smm_control0provides controls on the memory manager
_smm_freeable_retain5120value in KB of the instance freeable PGA memory to retain
_smm_isort_cap102400maximum work area for insertion sort(v1)
_smm_max_size102400maximum work area size in auto mode (serial)
_smm_max_size_static102400static maximum work area size in auto mode (serial)
_smm_min_size781minimum work area size in auto mode
_smm_px_max_size390656maximum work area size in auto mode (global)
_smm_px_max_size_static390656static maximum work area size in auto mode (global)
_smm_retain_size0work area retain size in SGA for shared server sessions (0 for AUTO)
_smm_trace0Turn on/off tracing for SQL memory manager
_smon_internal_errlimit100limit of SMON internal errors
_smon_ofd_sleep_interval300smon sleep internval for undo ofd test
_smon_undo_seg_rescan_limit10limit of SMON continous undo segments re-scan
_smu_debug_mode0- set debug event for testing SMU operations
_smu_error_simulation_site0site ID of error simulation in KTU code
_smu_error_simulation_type0error type for error simulation in KTU code
_smu_timeoutscomma-separated AND double-quoted list of AUM timeouts: mql, tur, sess_exprn, qry_exprn, slot_intvl
_snapshot_recovery_enabledTRUEenable/disable snapshot recovery
_so_percent_lower_bound_final80SO percent lower bound final
_so_percent_lower_bound_strt60SO percent lower bound start
_so_percent_upper_bound_final90SO percent upper bound final
_so_percent_upper_bound_strt70SO percent upper bound start
_sort_elimination_cost_ratio0cost ratio for sort eimination under first_rows mode
_sort_multiblock_read_count2multi-block read count for sort
_sort_spill_threshold0force sort to spill to disk each time this many rows are received
_sort_sync_min_spill_threshold90controls the mininum spill size for synchronized spill (in percent)
_sort_sync_min_spillsize262144controls the size of mininum run size for synchronized spill (in kb)
_space_align_size1048576space align size
_spacebg_sync_segblocksTRUEto enable/disable segmon driver
_spacereuse_track_memlimit10Percentage of shared pool for use by spacereuse tracking
_spadrYES_SPADR
_spare_test_parameter0Spare test parameter
_sparse_backing_fileAVMspecifies sparse backing file
_spawn_diag_opts0thread spawn diagnostic options
_spawn_diag_thresh_secs30thread spawn diagnostic minimal threshold in seconds
_spec_replace_locks_bodyTRUELock body when replacing a package specification
_spfdcOFFSPFDC
_spfeiSPFEI
_spfocOFFSPFOC
_spin_count2000Amount to spin waiting for a latch
_split_file_copyTRUEEnable block-level parallelism for file copy in Create PDB
_spr_max_rules10000maximum number of rules in sql spreadsheet
_spr_push_pred_refsprTRUEpush predicates through reference spreadsheet
_spr_use_AW_ASTRUEenable AW for hash table in spreadsheet
_sql_alias_scopeTRUEUse only SQL name resolution for a column whose alias matches that of some table
_sql_analyze_enable_auto_txnFALSESQL Analyze Autonomous Transaction control parameter
_sql_analyze_parse_model2SQL Analyze Parse Model control parameter
_sql_compatibility0sql compatability bit vector
_sql_connect_capability_override0SQL Connect Capability Table Override
_sql_connect_capability_tableSQL Connect Capability Table (testing only)
_sql_diag_repo_originallduarations where sql diag repository are retained
_sql_diag_repo_retainretain sql diag repository to cursor or not
_sql_hash_debug0Hash value of the SQL statement to debug
_sql_hvshare_debug1control hash value sharing debug level
_sql_hvshare_threshold0threshold to control hash value sharing across operators
_sql_model_unfold_forloopsRUN_TIMEspecifies compile-time unfolding of sql model forloops
_sql_ncg_modeOFFOptimization mode for SQL NCG
_sql_plan_directive_mgmt_control67controls internal SQL Plan Directive management activities
_sql_plan_management_control0controls various internal SQL Plan Management algorithms
_sql_show_exprevalFALSEshow expression evalution as shared hash producer in plan
_sqlexec_aggregation_settings0runtime settings for aggregation
_sqlexec_bitmap_options0settings for bitmap count distinct optimizations
_sqlexec_bitmap_sparse_size100maximum number of sparse bitmap values
_sqlexec_cache_aware_hash_aggr_enabledTRUEenable/disable cache aware hash aggregation
_sqlexec_cache_aware_hash_join_enabledTRUEenable/disable cache aware hash join
_sqlexec_disable_hash_based_distagg_tivFALSEdisable hash based distinct aggregation in TIV for gby queries
_sqlexec_distagg_optimization_settings0settings for distinct aggregation optimizations
_sqlexec_encoding_aware_hj_enabledTRUEenable/disable encoding aware hash join
_sqlexec_encoding_aware_hj_min_compression_ratio8minimum compression ratio to leverage encoding for HJ probe
_sqlexec_hash_aggr_small_mem_blocks2hash aggregation small initial memory footprint number of blocks
_sqlexec_hash_based_distagg_enabledTRUEenable hash based distinct aggregation for gby queries
_sqlexec_hash_based_distagg_ser_civ_enabledTRUEenable hash based distinct aggregation in serial/CIV queries
_sqlexec_hash_based_distagg_ssf_enabledTRUEenable hash based distinct aggregation for single set gby queries
_sqlexec_hash_based_set_operation_enabledTRUEenable/disable hash based set operation
_sqlexec_hash_join_uses_xmemFALSEenable/disable xmem PGA for hash join areas
_sqlexec_hash_rollup_enabledTRUEenable hash rollup
_sqlexec_join_group_aware_hj_enabledTRUEenable/disable join group aware hash join
_sqlexec_join_group_aware_hj_unencoded_rowsets_tolerated50minimum number of unencoded rowsets processed before adaptation
_sqlexec_pwiseops_with_binds_enabledTRUEenable partition wise execution in the presence of bind variables in inlist equality operator in where clause
_sqlexec_pwiseops_with_sqlfuncs_enabledTRUEenables partition wise operations even in the presence of functions over table partition keys
_sqlexec_reorder_wif_enabledTRUEenable re-ordering of window functions
_sqlexec_sort_uses_xmemTRUEenable/disable xmem PGA for sort areas
_sqlexec_use_delayed_unpackingTRUEenable/disable the usage of delayed unpacking
_sqlexec_use_kgghash3TRUEuse CRC-based hash function
_sqlexec_use_rwo_aware_expr_analysisTRUEenable/disable the usage of row vector aware expression analysis
_sqlmon_binds_xml_formatdefaultformat of column binds_xml in [G]V$SQL_MONITOR
_sqlmon_max_plan80Maximum number of plans entry that can be monitored. Defaults to 20 per CPU
_sqlmon_max_planlines1000Number of plan lines beyond which a plan cannot be monitored
_sqlmon_recycle_time5Minimum time (in s) to wait before a plan entry can be recycled
_sqlmon_threshold5CPU/IO time threshold before a statement is monitored. 0 is disabled
_sqlset_hash_max_size100000Max size of hash table used when loading into a SQL set
_sqltune_category_parsedDEFAULTParsed category qualifier for applying hintsets
_srvntfn_job_deq_timeout60srvntfn job deq timeout
_srvntfn_jobsubmit_interval3srvntfn job submit interval
_srvntfn_max_concurrent_jobs20srvntfn max concurrent jobs
_srvntfn_q_msgcount50srvntfn q msg count for job exit
_srvntfn_q_msgcount_inc100srvntfn q msg count increase for job submit
_sscr_dirSession State Capture and Restore DIRectory object
_sscr_osdirSession State Capture and Restore OS DIRectory
_sta_control0SQL Tuning Advisory control parameter
_stack_guard_level0stack guard level
_standby_auto_flashbackTRUEStandby automatic flashback when primary flashed back
_standby_causal_heartbeat_timeout2readable standby causal heartbeat timeout
_standby_flush_modeSLFLUSHstandby flush mode
_standby_implicit_rcv_timeout3minutes to wait for redo during standby implicit recovery
_standby_newkey_keystore_locationLocation of keystore on standby having new key
_standby_switchover_timeout120Number of secords for standby switchover enqueue timeout
_stat_aggs_one_pass_algorithmFALSEenable one pass algorithm for variance-related functions
_static_backgroundsstatic backgrounds
_statistics_based_srf_enabledTRUEenable/disable the use of statistics for storage reduction factor
_stats_encryption_enabledFALSEEnable statistics encryption on sensitive data
_step_down_limit_in_pct20step down limit in percentage
_streams_pool_max_size0streams pool maximum size when auto SGA enabled
_strict_dml_data_linkFALSEEnable strict semantics for DML into [Extended] Data Link
_strict_redaction_semanticsTRUEStrict Data Redaction semantics
_strict_utl_http_smtpTRUEEnforce strict URL checks on UTL_HTTP and UTL_SMTP Packages
_subquery_pruning_cost_factor20subquery pruning cost factor
_subquery_pruning_enabledTRUEenable the use of subquery predicates to perform pruning
_subquery_pruning_flags0subquery pruning flags
_subquery_pruning_mv_enabledFALSEenable the use of subquery predicates with MVs to perform pruning
_subquery_pruning_reduction50subquery pruning reduction factor
_super_shared_conversion_threshold320conversion threshold limit for supershared mode
_super_shared_enableFALSEenable super shared mode for latches
_super_shared_max_exclusive_conversions4Maximum consecutive exclusive conversions to convert a super shared latch
_suppress_identifiers_on_dupkeyFALSEsupress owner index name err msg
_suppress_migration_errorsTRUESuppress migration errors during Application Sync
_suspend_4031_timeout14400sga timeout in seconds for 4031
_suspend_4036_timeout14400pga timeout in seconds for 4036
_suspended_session_timeout300Timeout to kill suspended sess aft switchover
_swat_ver_mv_knob0Knob to control MV/REWRITE behavior
_switch_current_scan_scnTRUEswitch current uses scan scn
_switchover_through_cascadeTRUEEnable switchover through farsync
_switchover_timeout0Switchover timeout in minutes
_switchover_to_standby_optionOPEN_ALL_IGNORE_SESSIONSoption for graceful switchover to standby
_switchover_to_standby_switch_logFALSESwitchover to standby switches log for open redo threads
_swrf_metric_frequent_modeFALSEEnable/disable SWRF Metric Frequent Mode Collection
_swrf_mmon_dbfusTRUEEnable/disable SWRF MMON DB Feature Usage
_swrf_mmon_flushTRUEEnable/disable SWRF MMON FLushing
_swrf_mmon_metricsTRUEEnable/disable SWRF MMON Metrics Collection
_swrf_on_disk_enabledTRUEParameter to enable/disable SWRF
_swrf_test_action0test action parameter for SWRF
_swrf_test_dbfusFALSEEnable/disable DB Feature Usage Testing
_symbol_no_translationFALSEdisable symbol tranlations in call stacks
_sync_app_pdb_first_openFALSEsync application PDB automatically on first open
_sync_error_handlererror handler function for Application Sync
_sync_primary_wait_time5wait time for alter session sync with primary
_synchronous_rewrap_rac_ts_keysFALSEif TRUE, synchronously rewrap TS keys in all nodes in MK rekey
_synonym_repoint_tracingFALSEwhether to trace metadata comparisons for synonym repointing
_sys_logon_delay1The failed logon delay for the database instance
_sysaux_test_param1test parameter for SYSAUX
_sysdate_at_dbtimezoneFALSEreturn SYSDATE at database timezone
_system_api_interception_debugFALSEenable debug tracing for system api interception
_system_index_caching0optimizer percent system index caching
_system_memory_simulateFALSEsystem memory simulation mode, TRUE for hugetlbfs simulation
_system_partition_with_defaultFALSEallow default partition for system partitioned tables
_system_state_cputime_limit4294967294cputime limit for system state dump
_system_state_runtime_limit4294967294runtime limit for system state dump
_system_trig_enabledTRUEare system triggers enabled
_table_lookup_prefetch_size40table lookup prefetch vector size
_table_lookup_prefetch_thresh2table lookup prefetch threshold
_table_scan_cost_plus_oneTRUEbump estimated full table scan and index ffs cost by one
_tablespaces_per_transaction10estimated number of tablespaces manipulated by each transaction
_target_log_write_size0Do log write if this many redo blocks in buffer (auto=0)
_target_log_write_size_percent_for_poke100Ask LGWR to write if strand has this % of target write size blocks
_target_log_write_size_spinwait0How long LGWR spins to waits for target write size blocks
_target_log_write_size_timeout0How long LGWR will wait for redo to accumulate (msecs)
_target_rba_max_lag_percentage81target rba max log lag percentage
_tcpinfo_statistics_save_atexitFALSETCP Info Statistics Save At Exit
_tdb_debug_mode16set debug mode for testing transportable database
_temp_tran_block_threshold100number of blocks for a dimension before we temp transform
_temp_tran_cacheTRUEdetermines if temp table is created with cache option
_temp_undo_disable_adgFALSEis temp undo disabled on ADG
_temp_undo_disable_refresh_cloneTRUEis temp undo disabled on refreshable clone PDB
_temp_undo_optimal_extents0optimal number of extents for temp undo
_tenth_spare_parametertenth spare parameter - integer
_tenth_spare_pdb_parametertenth spare pdb parameter - integer
_test_flashback_shrink0test flashback datafile shrink feature
_test_hm_extent_mapFALSEheatmap related - to be used by oracle dev only
_test_ksusigskip5test the function ksusigskip
_test_offload_pdb_sga_initFALSETest offload of PDB SGA creation
_test_param_125test parmeter 1 - integer
_test_param_10test parameter 10 - string param
_test_param_10_bi10test parameter 10 - bigint param
_test_param_10_itest parameter 10 - int param
_test_param_11_base3test parameter 11 base
_test_param_11_dep0_STARTUP, 1_STARTUP, 2_STARTUPtest parameter 11 dependent
_test_param_120test parameter 12 - int param
_test_param_13FALSEtest parmeter 13 - boolean
_test_param_14test parmeter 14 - string list
_test_param_1550test parmeter 15 - integer
_test_param_2test parameter 2 - string
_test_param_3test parameter 3 - string
_test_param_4test parameter 4 - string list
_test_param_4_1test parameter 4_1 - nonsys mod. string list
_test_param_525test parmeter 5 - deprecated integer
_test_param_60test parmeter 6 - size (ub8)
_test_param_7100, 1100, 2100, 3100, 4100test parameter 7 - big integer list
_test_param_820test parameter 8 - cdb tests
_test_param_9test parameter 9 - umbrella param
_test_param_9_10test parameter 9_1 - cascade param1
_test_param_9_20_startuptest parameter 9_2 - cascade param2
_test_param_9_31_startup, 2_startup, 3_startuptest parameter 9_3 - cascade param3
_test_param_pdb_sparetest parameter pdb spare
_test_param_sparetest parameter spare
_test_xmem_alloc_size0unit test xmem alloc size
_third_spare_parameterthird spare parameter - integer
_third_spare_pdb_parameterthird spare pdb parameter - integer
_thirteenth_spare_pdb_parameterthirteenth spare pdb parameter - integer
_thirtieth_spare_parameterthirtieth spare parameter - integer
_thirtieth_spare_pdb_parameterthirtieth spare pdb parameter - string
_thirty-eighth_spare_parameterthirty-eighth spare parameter - integer
_thirty-eighth_spare_pdb_parameterthirty-eighth spare pdb parameter - string
_thirty-fifth_spare_parameterthirty-fifth spare parameter - integer
_thirty-fifth_spare_pdb_parameterthirty-fifth spare pdb parameter - string
_thirty-first_spare_parameterthirty-first spare parameter - integer
_thirty-first_spare_pdb_parameterthirty-first spare pdb parameter - string
_thirty-fourth_spare_parameterthirty-fourth spare parameter - integer
_thirty-fourth_spare_pdb_parameterthirty-fourth spare pdb parameter - string
_thirty-ninth_spare_parameterthirty-ninth spare parameter - integer
_thirty-ninth_spare_pdb_parameterthirty-ninth spare pdb parameter - string
_thirty-second_spare_parameterthirty-second spare parameter - integer
_thirty-second_spare_pdb_parameterthirty-second spare pdb parameter - string
_thirty-seventh_spare_parameterthirty-seventh spare parameter - integer
_thirty-seventh_spare_pdb_parameterthirty-seventh spare pdb parameter - string
_thirty-sixth_spare_parameterthirty-sixth spare parameter - integer
_thirty-sixth_spare_pdb_parameterthirty-sixth spare pdb parameter - string
_thirty-third_spare_parameterthirty-third spare parameter - integer
_thirty-third_spare_pdb_parameterthirty-third spare pdb parameter - string
_thread_state_change_timeout_pnp1800Thread state change timeout for PnP instance (in sec)
_threshold_alerts_enable1if 1, issue threshold-based alerts
_time_based_rcv_ckpt_target180time-based incremental recovery checkpoint target in sec
_time_based_rcv_hdr_update_interval180time-based incremental recovery file header update interval in sec
_timemodel_collectionTRUEenable timemodel collection
_timeout_actions_enabledTRUEenables or disables KSU timeout actions
_timer_precision10VKTM timer precision in milli-sec
_tkh_in_fsc_per_ts5Max tkh records stored in FSC per tablespace
_total_large_extent_memory0Total memory for allocating large extents
_touch_sga_pages_during_allocationFALSEtouch SGA pages during allocation
_tq_dump_period0time period for duping of TQ statistics (s)
_trace_buffer_wait_timeouts0trace buffer busy wait timeouts
_trace_buffersALL:256trace buffer sizes per process
_trace_dump_all_procsFALSEif TRUE on error buckets of all processes will be dumped to the current trace file
_trace_dump_client_bucketsTRUEif TRUE dump client (ie. non-kst) buckets
_trace_dump_cur_proc_onlyFALSEif TRUE on error just dump our process bucket
_trace_dump_static_onlyFALSEif TRUE filter trace dumps to always loaded dlls
_trace_eventstrace events enabled at startup
_trace_files_publicFALSECreate publicly accessible trace files
_trace_kqlidpFALSEtrace kqlidp0 operation
_trace_ktdsFALSETrace block reuse
_trace_ktfsFALSETrace ILM Stats Tracking
_trace_ktfs_memFALSEDebug memleak
_trace_navigation_scopeglobalenabling trace navigation linking
_trace_pin_timeFALSEtrace how long a current pin is held
_trace_pool_sizetrace pool size in bytes
_trace_processesALLenable KST tracing in process
_trace_suppresssuppresses matching trace for a given substring(prefix)
_trace_suppress_disableFALSEDisable trace suppress feature
_trace_tempFALSETrace Tempspace Management
_trace_virtual_columnsFALSEtrace virtual columns exprs
_track_metrics_memoryTRUEEnable/disable Metrics Memory Tracking
_track_space_reuseFALSESpaceReuse Tracking
_track_space_reuse_racFALSESpaceReuse Tracking Enable in RAC
_transaction_auditingTRUEtransaction auditing records generated in the redo log
_transaction_recovery_servers0max number of parallel recovery slaves that may be used
_transient_logical_clear_hold_mrp_bitFALSEclear KCCDI2HMRP flag during standby recovery
_truncate_optimization_enabledTRUEdo truncate optimization if set to TRUE
_tsenc_obfuscate_keyNONEEncryption key obfuscation in memory
_tsenc_tracing0Enable TS encryption tracing
_tsm_connect_stringTSM test connect string
_tsm_disable_auto_cleanup1Disable TSM auto cleanup actions
_tstz_localtime_bypassFALSEShould TTC not convert to LocalTime to preserve Timestamp with Timezone values
_ttc_annotations_level0enable ttc annotations
_tts_allow_charset_mismatchFALSEallow plugging in a tablespace with an incompatible character set
_twelfth_spare_pdb_parametertwelfth spare pdb parameter - integer
_twentieth_spare_parametertwentieth spare parameter - integer
_twentieth_spare_pdb_parametertwentieth spare pdb parameter - integer
_twenty-eighth_spare_parametertwenty-eighth spare parameter - integer
_twenty-eighth_spare_pdb_parametertwenty-eighth spare pdb parameter - string
_twenty-fifth_spare_parametertwenty-fifth spare parameter - integer
_twenty-fifth_spare_pdb_parametertwenty-fifth spare pdb parameter - string
_twenty-first_spare_parametertwenty-first spare parameter - integer
_twenty-first_spare_pdb_parametertwenty-first spare pdb parameter - string
_twenty-fourth_spare_parametertwenty-fourth spare parameter - integer
_twenty-fourth_spare_pdb_parametertwenty-fourth spare pdb parameter - string
_twenty-ninth_spare_parametertwenty-ninth spare parameter - integer
_twenty-ninth_spare_pdb_parametertwenty-ninth spare pdb parameter - string
_twenty-second_spare_parametertwenty-second spare parameter - integer
_twenty-second_spare_pdb_parametertwenty-second spare pdb parameter - string
_twenty-seventh_spare_parametertwenty-seventh spare parameter - integer
_twenty-seventh_spare_pdb_parametertwenty-seventh spare pdb parameter - string
_twenty-sixth_spare_parametertwenty-sixth spare parameter - integer
_twenty-sixth_spare_pdb_parametertwenty-sixth spare pdb parameter - string
_twenty-third_spare_parametertwenty-third spare parameter - integer
_twenty-third_spare_pdb_parametertwenty-third spare pdb parameter - string
_two-hundred-and-eighteenth_spare_parameterFALSEtwo-hundred-and-eighteenth spare parameter - boolean
_two-hundred-and-eighth_spare_parameterFALSEtwo-hundred-and-eighth spare parameter - boolean
_two-hundred-and-eleventh_spare_parameterFALSEtwo-hundred-and-eleventh spare parameter - boolean
_two-hundred-and-fifteenth_spare_parameterFALSEtwo-hundred-and-fifteenth spare parameter - boolean
_two-hundred-and-fifth_spare_parameterFALSEtwo-hundred-and-fifth spare parameter - boolean
_two-hundred-and-first_spare_parameterFALSEtwo-hundred-and-first spare parameter - boolean
_two-hundred-and-fourteenth_spare_parameterFALSEtwo-hundred-and-fourteenth spare parameter - boolean
_two-hundred-and-fourth_spare_parameterFALSEtwo-hundred-and-fourth spare parameter - boolean
_two-hundred-and-nineteenth_spare_parameterFALSEtwo-hundred-and-nineteenth spare parameter - boolean
_two-hundred-and-ninth_spare_parameterFALSEtwo-hundred-and-ninth spare parameter - boolean
_two-hundred-and-second_spare_parameterFALSEtwo-hundred-and-second spare parameter - boolean
_two-hundred-and-seventeenth_spare_parameterFALSEtwo-hundred-and-seventeenth spare parameter - boolean
_two-hundred-and-seventh_spare_parameterFALSEtwo-hundred-and-seventh spare parameter - boolean
_two-hundred-and-sixteenth_spare_parameterFALSEtwo-hundred-and-sixteenth spare parameter - boolean
_two-hundred-and-sixth_spare_parameterFALSEtwo-hundred-and-sixth spare parameter - boolean
_two-hundred-and-tenth_spare_parameterFALSEtwo-hundred-and-tenth spare parameter - boolean
_two-hundred-and-third_spare_parameterFALSEtwo-hundred-and-third spare parameter - boolean
_two-hundred-and-thirteenth_spare_parameterFALSEtwo-hundred-and-thirteenth spare parameter - boolean
_two-hundred-and-twelfth_spare_parameterFALSEtwo-hundred-and-twelfth spare parameter - boolean
_two-hundred-and-twentieth_spare_parameterFALSEtwo-hundred-and-twentieth spare parameter - boolean
_two-hundredth_spare_parameterFALSEtwo-hundredth spare parameter - boolean
_two_passTRUEenable two-pass thread recovery
_two_pass_reverse_polish_enabledTRUEuses two-pass reverse polish alg. to generate canonical forms
_txn_control_trace_buf_size4096size the in-memory buffer size of txn control
_txn_spare10transaction spare variable1
_txn_spare20transaction spare variable2
_txn_spare30transaction spare variable3
_uga_cga_large_extent_size262144UGA/CGA large extent size
_ultrafast_latch_statisticsTRUEmaintain fast-path statistics for ultrafast latches
_umf_remote_enabledFALSEEnable remote UMF operations
_umf_remote_target_dblinkUMF Remote Target DBLink for Flushing
_umf_test_action0test action parameter for UMF
_undo_autotuneTRUEenable auto tuning of undo_retention
_undo_block_compressionTRUEenable undo block compression
_undo_debug_mode0debug flag for undo related operations
_undo_debug_usage0invoke undo usage functions for testing
_undo_ofd_enabledTRUEenable ordered offline drop of undo segments for datafile shrink
_undo_ofd_excess10percent of excess undo segments to offline or drop
_undo_ofd_reserve30percent of excess undo segments to keep online
_undo_tbs_slave_percent0Percentage of redo slaves for undo tablespace
_undotbs_regular_tablesFALSECreate regular tables in undo tablespace
_undotbs_stepdown_pcent75Undo Tablespace small allocation step down percentage
_unified_audit_policy_disabledFALSEDisable Default Unified Audit Policies on DB Create
_unified_pga_block_size262144Unified PGA internal block size
_unified_pga_gran_free_timeout3000Granule free timeout
_unified_pga_gran_leak_timeout180000Granule leak timeout
_unified_pga_list_count16Unified PGA internal list count
_unified_pga_max_pool_size0max size in bytes of the unified pga pool
_unified_pga_pool_size0size in bytes of the unified pga pool
_union_rewrite_for_gsYES_GSET_MVSexpand queries with GSets into UNIONs for rewrite
_uniq_cons_sql_enforcementTRUEdisable extended data unique constraint SQL enforcement
_unnest_subqueryTRUEenables unnesting of complex subqueries
_unused_block_compressionTRUEenable unused block compression
_update_datafile_headers_with_space_informationFALSEuser requested update of datafile headers of locally managed datafiles with space information
_upddel_dba_hash_mask_bits0controls masking of lower order bits in DBA
_upgrade_capture_noopsTRUEdo not skip capturing noops during upgrade
_upgrade_optimTRUEUpgrade optimization enabled
_upgrade_pdb_on_openTRUEEnable upgrading a PDB automatically on open
_usd_preload_blks4USD preload block count for prefetch
_usd_recent_readTRUEAllow to scan recent USD blocks
_use_adaptive_log_file_syncTRUEAdaptively switch between post/wait and polling
_use_best_fitFALSEuse best fit to allocate space
_use_cached_asm_free_spaceFALSEShould x$kttets use cached ASM free space info
_use_column_stats_for_functionTRUEenable the use of column statistics for DDP functions
_use_dynamic_shares1use dynamic shares
_use_fallocate_for_mgaFALSEMGA fallocate enabled
_use_fips_modeFALSEEnable use of crypographic libraries in FIPS mode
_use_futex_ipcFALSEuse futex ipc
_use_hugetlbfs_for_SGAFALSEEnable HugeTLBFS usage for SGA
_use_hugetlbfs_per_granuleFALSEEnable file per granule with HugeTLBFS
_use_hybrid_encryption_modeFALSEEnable platform optimized encryption in hybrid mode
_use_ismTRUEEnable Shared Page Tables - ISM
_use_ism_for_pgaTRUEUse ISM for allocating large extents
_use_large_pages_for_mgaFALSEMGA largepage enabled
_use_nosegment_indexesFALSEuse nosegment indexes in explain plan
_use_pdb_parselockTRUEuse PDB level parselock on ADG
_use_platform_compression_libTRUEEnable platform optimized compression implementation
_use_platform_encryption_libTRUEEnable platform optimized encryption implementation
_use_platform_hash_functionTRUEcontrol use of platform specific hash function
_use_realfree_heapTRUEuse real-free based allocator for PGA memory
_use_seq_process_cacheTRUEwhether to use process local seq cache
_use_single_log_writerADAPTIVEUse a single process for redo log writing
_use_vector_postTRUEuse vector post
_use_zero_copy_ioTRUEShould network vector IO interface be used for data transfer
_user_defined_sharding0enable user-defined sharding
_ut_fast_lrg_predictionFALSEuse short interval for session SO prediction
_utl32k_mv_queryFALSEutl32k.sql is compiling a materialized view query
_utlfile_dirpathFALSEreturn Utl_File Accessible
_utlmmig_table_stats_gatheringTRUEenable/disable utlmmig table stats gathering at upgrade
_uts_disable_client_ip_traceFALSEDisables the printing of client IP address in trace files
_uts_enable_alltrc_statsFALSEEnables accounting of trace data in incident and cdmp trace files
_uts_first_segment_retainTRUEShould we retain the first trace segment
_uts_first_segment_size0Maximum size (in bytes) of first segments
_uts_force_seclabel_prefixFALSEForce output of trace record security label prefix
_uts_inc_inmem_trace0Controls UTS in-memory tracing during an active incident
_uts_trace_buffer_size0Trace disk buffer size
_uts_trace_disk_threshold0Trace disk threshold parameter
_uts_trace_files_nopurgeFALSESets trace files to not get purged
_uts_trace_segment_size0Maximum size (in bytes) of a trace segment
_uts_trace_segments5Maximum number of trace segments
_validate_flashback_databaseFALSEScan database to validate result of flashback database
_validate_metric_groupsFALSEEnable/disable SGA Metric Structure validation
_validate_readmem_redoHEADER_ONLYvalidate redo blocks read from in-memory log buffer
_vector_aggregation_max_size0max size of vector aggregation space
_vector_dense_accum_max100vector group by dense accumulator space max
_vector_encoding_modeMANUALenable vector encoding(OFF/MANUAL/AUTO)
_vector_operations_control0control different uses/algorithms related to vector transform
_vector_serialize_temp_threshold1000threshold for serializing vector transform temp table writes
_vendor_lib_locVendor library search root directory
_verify_encrypted_tablespace_keysTRUEif TRUE, verify encryption key signature for data files
_verify_fg_log_checksumFALSELGWR verifies redo checksums generated by foreground processes
_verify_flashback_redoTRUEVerify that the redo logs needed for flashback are available
_verify_undo_quotaFALSETRUE - verify consistency of undo quota statistics
_very_large_object_threshold500upper threshold level of object size for direct reads
_virtual_column_access_controlTRUErequire VPD/RAS protection for virtual columns derived from protected columns
_virtual_column_overload_allowedTRUEoverload virtual columns expression
_vkrm_schedule_interval10VKRM scheduling interval
_vktm_assert_thresh30soft assert threshold VKTM timer drift
_wait_breakup_threshold_csecs600Wait breakup threshold (in centiseconds)
_wait_breakup_time_csecs300Wait breakup time (in centiseconds)
_wait_for_busy_session10Wait time before killing active sessions during switchover
_wait_for_syncTRUEwait for sync on commit MUST BE ALWAYS TRUE
_wait_outlier_detection_enableOFFEnable wait outlier detection module?
_wait_outlier_dump_flags0Wait Outlier Dump Flags
_wait_outlier_event_namesWait events to watch for outliers
_wait_outlier_lambda_x10001500Lambda (in thousands) to compute outliers
_wait_outlier_min_waits10Minimum waits required to enable wait outliers detection
_wait_outlier_num_outliers600Max number of outliers tracked
_wait_samples_max_sections40Wait Samples maximum sections
_wait_samples_max_time_secs120Wait Samples maximum time in seconds
_wait_tracker_interval_secs10Wait Tracker number of seconds per interval
_wait_tracker_num_intervals0Wait Tracker number of intervals
_wait_yield_hp_modeyieldWait Yield - High Priority Mode
_wait_yield_modeyieldWait Yield - Mode
_wait_yield_sleep_freq100Wait Yield - Sleep Frequency
_wait_yield_sleep_time_msecs1Wait Yield - Sleep Time (in milliseconds)
_wait_yield_yield_freq20Wait Yield - Yield Frequency
_walk_insert_threshold0maximum number of unusable blocks to walk across freelist
_watchpoint_onFALSEis the watchpointing feature turned on?
_wcr_control0Oracle internal test WCR parameter used ONLY for testing!
_wcr_grv_cache_size65535Oracle internal: Set the replay cache size for WRR$_REPLAY_DATA.
_wcr_seq_cache_size65535Oracle internal: Set the replay cache size for WRR$_REPLAY_SEQ_DATA.
_wcr_test_action0Oracle internal test WCR parameter used for test actions
_widetab_comp_enabledTRUEwide table compression enabled
_windowfunc_optimization_settings0settings for window function optimizations
_with_subqueryOPTIMIZERWITH subquery transformation
_worker_threads0Number of worker threads
_workload_attributessession workload attributes
_write_clones3write clones flag
_write_renamed_datafile_nameFALSEprint renamed datafile names to alert log
_xa_internal_retries600number of internal retries for xa transactions
_xds_max_child_cursors100Maximum number of XDS user-specific child cursors
_xengem_devnameDEFAULToverride default VM GEM device name used by skgvm
_xengem_diagmodeOFFset to OFF to disable VM GEM support and functionalities
_xengem_enabledTRUEEnable OVM GEM support
_xpl_peeked_binds_log_size8192maximum bytes for logging peeked bind values for V$SQL_PLAN (0 = OFF)
_xpl_trace0Explain Plan tracing parameter
_xs_cleanup_taskTRUETriton Session Cleanup
_xs_dispatcher_onlyFALSEXS dispatcher only mode
_xs_logon_grantFALSECreate session privilege is required for RAS direct logon user to login to database
_xs_sidp_allow_sha1TRUEXS SIDP allow use of SHA1
_xsolapi_auto_materialization_bound20OLAP API lower bound for auto materialization.
_xsolapi_auto_materialization_typePRED_AND_RCOLAP API behavior for auto materialization
_xsolapi_build_traceFALSEOLAP API output build info to trace file
_xsolapi_debug_outputSUPPRESSOLAP API debug output disposition
_xsolapi_densify_cubesTABULAROLAP API cube densification
_xsolapi_dimension_group_creationOVERFETCHOLAP API symmetric overfetch
_xsolapi_dml_traceOLAP API output dml commands and expressions to trace file
_xsolapi_fetch_typePARTIALOLAP API fetch type
_xsolapi_fix_vptrsTRUEOLAP API Enable vptr fixing logic in shared server mode
_xsolapi_generate_with_clauseFALSEOLAP API generates WITH clause?
_xsolapi_hierarchy_value_typeuniqueOLAP API hierarchy value type
_xsolapi_load_at_process_startNEVERWhen to load OLAP API library at server process start
_xsolapi_materialization_rowcache_min_rows_for_use1OLAP API min number of rows required to use rowcache in query materialization
_xsolapi_materialize_sourcesTRUEOLAP API Enable source materialization
_xsolapi_metadata_reader_modeDEFAULTOLAP API metadata reader mode
_xsolapi_odbo_modeFALSEOLAP API uses ODBO mode?
_xsolapi_opt_aw_positionTRUEOLAP API enables AW position and count optimization?
_xsolapi_optimize_suppressionTRUEOLAP API optimizes suppressions?
_xsolapi_precompute_subqueryTRUEOLAP API precomputes subqueries?
_xsolapi_remove_columns_for_materializationTRUEOLAP API removes columns for materialization?
_xsolapi_set_nlsTRUEOLAP API sets NLS?
_xsolapi_share_executorsTRUEOLAP API share executors?
_xsolapi_source_traceFALSEOLAP API output Source definitions to trace file
_xsolapi_sql_all_multi_join_non_base_hintsOLAP API multi-join non-base hints
_xsolapi_sql_all_non_base_hintsOLAP API non-base hints
_xsolapi_sql_auto_dimension_hintsFALSEOLAP API enable automatic dimension hints
_xsolapi_sql_auto_measure_hintsTRUEOLAP API enable automatic measure hints
_xsolapi_sql_dimension_hintsOLAP API dimension hints
_xsolapi_sql_enable_aw_joinTRUEOLAP API enables AW join?
_xsolapi_sql_enable_aw_qdr_mergeTRUEOLAP API enables AW QDR merge?
_xsolapi_sql_hintsOLAP API generic hints
_xsolapi_sql_measure_hintsOLAP API measure hints
_xsolapi_sql_minus_threshold1000OLAP API SQL MINUS threshold
_xsolapi_sql_optimizeTRUEOLAP API enable optimization
_xsolapi_sql_prepare_stmt_cache_size16OLAP API prepare statement cache size
_xsolapi_sql_remove_columnsTRUEOLAP API enable remove unused columns optimizations
_xsolapi_sql_result_set_cache_size32OLAP API result set cache size
_xsolapi_sql_symmetric_predicateTRUEOLAP API enable symmetric predicate for dimension groups
_xsolapi_sql_top_dimension_hintsOLAP API top dimension hints
_xsolapi_sql_top_measure_hintsOLAP API top measure hints
_xsolapi_sql_use_bind_variablesTRUEOLAP API enable bind variables optimization
_xsolapi_stringify_order_levelsFALSEOLAP API stringifies order levels?
_xsolapi_support_mtmFALSEOLAP API MTM mapping classes supported?
_xsolapi_suppression_aw_mask_threshold1000OLAP API suppression AW mask threshold
_xsolapi_suppression_chunk_size4000OLAP API suppression chunk size
_xsolapi_use_modelsTRUEOLAP API uses models?
_xsolapi_use_olap_dmlTRUEOLAP API uses OLAP DML?
_xsolapi_use_olap_dml_for_rankTRUEOLAP API uses OLAP DML for rank?
_xt_coveragenoneexternal tables code coverage parameter
_xt_def_compression_ratio4Default compression ratio for external table data files
_xt_enable_columnar_fetchTRUEEnable external table columnar fetch
_xt_http_wsclFALSEUse KGWSCL for HTTP requests
_xt_legacy_debug_flags0Debug flags for ORACLE_LOADER and ORACLE_DATAPUMP
_xt_preproc_timeout100external table preprocessor timeout
_xt_sampling_scan_granulesONGranule Sampling for Block Sampling of External Tables
_xt_sampling_scan_granules_min_granules1Minimum number of granules to scan for granule sampling
_xt_tracenoneexternal tables trace parameter
_xtbigdata_max_buffersize10240maximum size of IO Buffers for exadoop external tables (in KB)
_xtbuffer_size0buffer size in KB needed for populate/query operation
_xtts_allow_pre10FALSEallow cross platform for pre10 compatible tablespace
_xtts_set_platform_infoFALSEset cross platform info during file header read
_zonemap_auto_candidate_table_min_size5000Minimum size for a table to be candidate for an automatic zonemap
_zonemap_auto_clustering_ratio50Data clustering ratio in percent for automatic zonemap columns
_zonemap_control0control different uses/algorithms related to zonemaps
_zonemap_refresh_within_loadTRUEControl the refresh of basic zonemaps during/after data load
_zonemap_staleness_tracking1control the staleness tracking of zonemaps via trigger
_zonemap_usage_trackingTRUEControl the capture of zonemap usage statistics
_zonemap_use_enabledTRUEenable the use of zonemaps for IO pruning
active_instance_countnumber of active instances in the cluster database
adg_account_info_trackingLOCALADG user account info tracked in standby(LOCAL) or in Primary(GLOBAL)
adg_redirect_dmlFALSEEnable DML Redirection from ADG
allow_deprecated_rpcsYESallow deprecated rpcs
allow_global_dblinksFALSELDAP lookup for DBLINKS
allow_group_access_to_sgaFALSEAllow read access for SGA to users of Oracle owner group
allow_rowid_column_typeFALSEAllow creation of rowid column
approx_for_aggregationFALSEReplace exact aggregation with approximate aggregation
approx_for_count_distinctFALSEReplace count distinct with approx_count_distinct
approx_for_percentileNONEReplace percentile_* with approx_percentile
aq_tm_processes1number of AQ Time Managers to start
archive_lag_target0Maximum number of seconds of redos the standby could lose
asm_diskstringdisk set locations for discovery
asm_preferred_read_failure_groupspreferred read failure groups
audit_file_dest/u01/app/oracle/admin/orcl21c/adumpDirectory in which auditing files are to reside
audit_sys_operationsTRUEenable sys auditing
audit_syslog_levelSyslog facility and level
audit_trailDBenable system auditing
auto_start_pdb_servicesFALSEAutomatically start all PDB services on PDB Open
autotask_max_active_pdbs2Setting for Autotask Maximum Maintenance PDBs
awr_pdb_autoflush_enabledFALSEEnable/Disable AWR automatic PDB flushing
awr_pdb_max_parallel_slaves10maximum concurrent AWR PDB MMON slaves per instance
awr_snapshot_time_offset0Setting for AWR Snapshot Time Offset
background_core_dumppartialCore Size for Background Processes
background_dump_dest/u01/app/oracle/homes/OraDB21Home1/rdbms/logDetached process dump directory
backup_tape_io_slavesFALSEBACKUP Tape I/O slaves
bitmap_merge_area_size1048576maximum memory allow for BITMAP MERGE
blank_trimmingFALSEblank trimming semantics parameter
blockchain_table_max_no_dropmaximum idle retention minutes for blockchain tables
buffer_pool_keepNumber of database blocks/latches in keep buffer pool
buffer_pool_recycleNumber of database blocks/latches in recycle buffer pool
cdb_clusterFALSEif TRUE startup in CDB Cluster mode
cdb_cluster_nameCDB Cluster name
cell_offload_compactionADAPTIVECell packet compaction strategy
cell_offload_decryptionTRUEenable SQL processing offload of encrypted data to cells
cell_offload_parametersAdditional cell offload parameters
cell_offload_plan_displayAUTOCell offload explain plan display
cell_offload_processingTRUEenable SQL processing offload to cells
cell_offloadgroup_nameSet the offload group name
circuitsmax number of circuits
client_result_cache_lag3000client result cache maximum lag in milliseconds
client_result_cache_size0client result cache max size in bytes
client_statistics_levelTYPICALClient Statistics Level
clonedbFALSEclone database
clonedb_dirCloneDB Directory
cluster_databaseFALSEif TRUE startup in cluster database mode
cluster_interconnectsinterconnects for RAC use
commit_loggingtransaction commit log write behaviour
commit_point_strength1Bias this node has toward not preparing in a two-phase commit
commit_waittransaction commit log wait behaviour
commit_writetransaction commit log write behaviour
common_user_prefixC##Enforce restriction on a prefix of a Common User/Role/Profile name
compatible21.0.0Database will be completely compatible with this software version
connection_brokers((TYPE=DEDICATED)(BROKERS=1)), ((TYPE=EMON)(BROKERS=1))connection brokers specification
container_dataALLwhich containers should data be returned from?
containers_parallel_degree65535Parallel degree for a CONTAINERS() query
control_file_record_keep_time7control file record keep time in days
control_files/u01/app/oracle/oradata/ORCL21C/control01.ctl, /u01/app/oracle/oradata/ORCL21C/control02.ctlcontrol file names list
control_management_pack_accessDIAGNOSTIC+TUNINGdeclares which manageability packs are enabled
core_dump_dest/u01/app/oracle/diag/rdbms/orcl21c/orcl21c/cdumpCore dump directory
cpu_count4maximum number of CPUs
cpu_min_count4minimum number of CPUs required
create_bitmap_area_size8388608size of create bitmap buffer for bitmap index
create_stored_outlinescreate stored outlines for DML statements
cursor_bind_capture_destinationmemory+diskAllowed destination for captured bind variables
cursor_invalidationIMMEDIATEdefault for DDL cursor invalidation semantics
cursor_sharingEXACTcursor sharing mode
cursor_space_for_timeFALSEuse more memory in order to get faster execution
data_guard_max_io_time240maximum I/O time before process considered hung
data_guard_max_longio_time240maximum long I/O time before process considered hung
data_guard_sync_latency0Data Guard SYNC latency
data_transfer_cache_size0Size of data transfer cache
db_16k_cache_size0Size of cache for 16K buffers
db_2k_cache_size0Size of cache for 2K buffers
db_32k_cache_size0Size of cache for 32K buffers
db_4k_cache_size0Size of cache for 4K buffers
db_8k_cache_size0Size of cache for 8K buffers
db_big_table_cache_percent_target0Big table cache target size in percentage
db_block_buffers0Number of database blocks cached in memory
db_block_checkingFALSEheader checking and data and index block checking
db_block_checksumTYPICALstore checksum in db blocks and check during reads
db_block_size8192Size of database block in bytes
db_cache_adviceONBuffer cache sizing advisory
db_cache_size0Size of DEFAULT buffer pool for standard block size buffers
db_create_file_destdefault database location
db_create_online_log_dest_1online log/controlfile destination #1
db_create_online_log_dest_2online log/controlfile destination #2
db_create_online_log_dest_3online log/controlfile destination #3
db_create_online_log_dest_4online log/controlfile destination #4
db_create_online_log_dest_5online log/controlfile destination #5
db_domaindirectory part of global database name stored with CREATE DATABASE
db_file_multiblock_read_count128db block to be read each IO
db_file_name_convertdatafile name convert patterns and strings for standby/clone db
db_files200max allowable # db files
db_flash_cache_fileflash cache file for default block size
db_flash_cache_size0flash cache size for db_flash_cache_file
db_flashback_retention_target1440Maximum Flashback Database log retention time in minutes.
db_index_compression_inheritanceNONEoptions for table or tablespace level compression inheritance
db_keep_cache_size0Size of KEEP buffer pool for standard block size buffers
db_lost_write_protectNONEenable lost write detection
db_nameorcl21cdatabase name specified in CREATE DATABASE
db_performance_profileDatabase performance category
db_recovery_file_dest/u01/fradefault database recovery file location
db_recovery_file_dest_size107374182400database recovery files size limit
db_recycle_cache_size0Size of RECYCLE buffer pool for standard block size buffers
db_securefilePREFERREDpermit securefile storage during lob creation
db_ultra_safeOFFSets defaults for other parameters that control protection levels
db_unique_nameorcl21cDatabase Unique Name
db_unrecoverable_scn_trackingTRUETrack nologging SCN in controlfile
db_writer_processes1number of background database writer processes to start
dbnest_enableNONEdatabase Nest enable
dbnest_pdb_fs_confPDB Filesystem configuration
dbwr_io_slaves0DBWR I/O slaves
ddl_lock_timeout0timeout to restrict the time that ddls wait for dml lock
default_sharingmetadataDefault sharing clause
deferred_segment_creationTRUEdefer segment creation to first insert
dg_broker_config_file1/u01/app/oracle/homes/OraDB21Home1/dbs/dr1orcl21c.datdata guard broker configuration file #1
dg_broker_config_file2/u01/app/oracle/homes/OraDB21Home1/dbs/dr2orcl21c.datdata guard broker configuration file #2
dg_broker_startFALSEstart Data Guard broker (DMON process)
diagnostic_dest/u01/app/oraclediagnostic base directory
diagnostics_controlIGNOREcontrols response when 'enabling diagnostics' privilege is absent
disable_pdb_feature0Disable features
disk_asynch_ioTRUEUse asynch I/O for random access devices
dispatchers(PROTOCOL=TCP) (SERVICE=orcl21cXDB)specifications of dispatchers
distributed_lock_timeout60number of seconds a distributed transaction waits for a lock
dml_locks2216dml locks - one for each table modified in a transaction
dnfs_batch_size4096Max number of dNFS asynch I/O requests queued per session
drcp_connection_limit0DRCP connection limit
drcp_dedicated_optNOTurn on/off dedicated optimization for DRCP
dst_upgrade_insert_convTRUEEnables/Disables internal conversions during DST upgrade
enable_automatic_maintenance_pdbTRUEEnable/Disable Automated Maintenance for Non-Root PDB
enable_ddl_loggingFALSEenable ddl logging
enable_dnfs_dispatcherFALSEEnable DNFS Dispatcher
enable_goldengate_replicationFALSEgoldengate replication enabled
enable_imc_with_miraFALSEenable IMC with multi instance redo apply
enable_per_pdb_drcpFALSETurn on/off per PDB DRCP
enable_pluggable_databaseTRUEEnable Pluggable Database
enabled_PDBs_on_standby*List of Enabled PDB patterns
encrypt_new_tablespacesCLOUD_ONLYwhether to encrypt newly created tablespaces
eventdebug event control - default null string
external_keystore_credential_locationexternal keystore credential location
fal_clientFAL client
fal_serverFAL server list
fast_start_io_target0Upper bound on recovery reads
fast_start_mttr_target0MTTR target in seconds
fast_start_parallel_rollbackLOWmax number of parallel recovery slaves that may be used
file_mappingFALSEenable file mapping
fileio_network_adaptersNetwork Adapters for File I/O
filesystemio_optionssetallIO operations on filesystem files
fixed_datefixed SYSDATE value
forward_listenerforward listener
gcs_server_processes0number of background gcs server processes to start
global_namesFALSEenforce that database links have same name as remote database
global_txn_processes1number of background global transaction processes to start
hash_area_size131072size of in-memory hash work area
heartbeat_batch_size5Number of heartbeats to be sent in a batch
heat_mapOFFILM Heatmap Tracking
hi_shared_memory_address0SGA starting address (high order 32-bits on 64-bit platforms)
hs_autoregisterTRUEenable automatic server DD updates in HS agent self-registration
http_proxyhttp_proxy
hybrid_read_onlyFALSEHybrid read only mode allows CDB common user to patch the PDB
ifileinclude file in init.ora
ignore_session_set_param_errorsIgnore errors during alter session param set
inmemory_adg_enabledTRUEEnable IMC support on ADG
inmemory_automatic_levelOFFEnable Automatic In-Memory management
inmemory_clause_defaultDefault in-memory clause for new tables
inmemory_deep_vectorizationTRUEIn-Memory Deep Vectorization Enabled
inmemory_expressions_usageENABLEControls which In-Memory Expressions are populated in-memory
inmemory_forceDEFAULTForce tables to be in-memory or not
inmemory_max_populate_servers0maximum inmemory populate servers
inmemory_optimized_arithmeticDISABLEControls whether or not DSBs are stored in-memory
inmemory_prefer_xmem_memcompressPrefer to store tables with given memcompress levels in xmem
inmemory_prefer_xmem_priorityPrefer to store tables with given priority levels in xmem
inmemory_queryENABLESpecifies whether in-memory queries are allowed
inmemory_size0size in bytes of in-memory area
inmemory_trickle_repopulate_servers_percent1inmemory trickle repopulate servers percent
inmemory_virtual_columnsMANUALControls which user-defined virtual columns are stored in-memory
inmemory_xmem_size0size in bytes of in-memory xmem area
instance_abort_delay_time0time to delay an internal initiated abort (in seconds)
instance_groupslist of instance group names
instance_modeREAD-WRITEindicates whether the instance read-only or read-write or read-mostly
instance_nameorcl21cinstance name supported by the instance
instance_number0instance number
instance_typeRDBMStype of instance to be executed
instant_restoreFALSEinstant repopulation of datafiles
java_jit_enabledTRUEJava VM JIT enabled
java_max_sessionspace_size0max allowed size in bytes of a Java sessionspace
java_pool_size0size in bytes of java pool
java_restrictnoneRestrict Java VM Access
java_soft_sessionspace_limit0warning limit on size in bytes of a Java sessionspace
job_queue_processes80maximum number of job queue slave processes
kafka_config_fileKSR pub/sub external message bus(KSRPS) CONFIGuration file
large_pool_size0size in bytes of large pool
ldap_directory_accessNONERDBMS's LDAP access option
ldap_directory_sysauthnoOID usage parameter
license_max_sessions0maximum number of non-system user sessions allowed
license_max_users0maximum number of named users that can be created in the database
license_sessions_warning0warning level for number of non-system user sessions
listener_networkslistener registration networks
lob_signature_enableFALSEenable lob signature
local_listenerLISTENER_ORCL21Clocal listener
lock_name_spacelock name space used for generating lock names for standby/clone database
lock_sgaFALSELock entire SGA in physical memory
log_archive_configlog archive config
log_archive_destarchival destination text string
log_archive_dest_1archival destination #1 text string
log_archive_dest_10archival destination #10 text string
log_archive_dest_11archival destination #11 text string
log_archive_dest_12archival destination #12 text string
log_archive_dest_13archival destination #13 text string
log_archive_dest_14archival destination #14 text string
log_archive_dest_15archival destination #15 text string
log_archive_dest_16archival destination #16 text string
log_archive_dest_17archival destination #17 text string
log_archive_dest_18archival destination #18 text string
log_archive_dest_19archival destination #19 text string
log_archive_dest_2archival destination #2 text string
log_archive_dest_20archival destination #20 text string
log_archive_dest_21archival destination #21 text string
log_archive_dest_22archival destination #22 text string
log_archive_dest_23archival destination #23 text string
log_archive_dest_24archival destination #24 text string
log_archive_dest_25archival destination #25 text string
log_archive_dest_26archival destination #26 text string
log_archive_dest_27archival destination #27 text string
log_archive_dest_28archival destination #28 text string
log_archive_dest_29archival destination #29 text string
log_archive_dest_3archival destination #3 text string
log_archive_dest_30archival destination #30 text string
log_archive_dest_31archival destination #31 text string
log_archive_dest_4archival destination #4 text string
log_archive_dest_5archival destination #5 text string
log_archive_dest_6archival destination #6 text string
log_archive_dest_7archival destination #7 text string
log_archive_dest_8archival destination #8 text string
log_archive_dest_9archival destination #9 text string
log_archive_dest_state_1enablearchival destination #1 state text string
log_archive_dest_state_10enablearchival destination #10 state text string
log_archive_dest_state_11enablearchival destination #11 state text string
log_archive_dest_state_12enablearchival destination #12 state text string
log_archive_dest_state_13enablearchival destination #13 state text string
log_archive_dest_state_14enablearchival destination #14 state text string
log_archive_dest_state_15enablearchival destination #15 state text string
log_archive_dest_state_16enablearchival destination #16 state text string
log_archive_dest_state_17enablearchival destination #17 state text string
log_archive_dest_state_18enablearchival destination #18 state text string
log_archive_dest_state_19enablearchival destination #19 state text string
log_archive_dest_state_2enablearchival destination #2 state text string
log_archive_dest_state_20enablearchival destination #20 state text string
log_archive_dest_state_21enablearchival destination #21 state text string
log_archive_dest_state_22enablearchival destination #22 state text string
log_archive_dest_state_23enablearchival destination #23 state text string
log_archive_dest_state_24enablearchival destination #24 state text string
log_archive_dest_state_25enablearchival destination #25 state text string
log_archive_dest_state_26enablearchival destination #26 state text string
log_archive_dest_state_27enablearchival destination #27 state text string
log_archive_dest_state_28enablearchival destination #28 state text string
log_archive_dest_state_29enablearchival destination #29 state text string
log_archive_dest_state_3enablearchival destination #3 state text string
log_archive_dest_state_30enablearchival destination #30 state text string
log_archive_dest_state_31enablearchival destination #31 state text string
log_archive_dest_state_4enablearchival destination #4 state text string
log_archive_dest_state_5enablearchival destination #5 state text string
log_archive_dest_state_6enablearchival destination #6 state text string
log_archive_dest_state_7enablearchival destination #7 state text string
log_archive_dest_state_8enablearchival destination #8 state text string
log_archive_dest_state_9enablearchival destination #9 state text string
log_archive_duplex_destduplex archival destination text string
log_archive_format%t_%s_%r.dbfarchival destination format
log_archive_max_processes4maximum number of active ARCH processes
log_archive_min_succeed_dest1minimum number of archive destinations that must succeed
log_archive_startFALSEstart archival process on SGA initialization
log_archive_trace0Establish archive operation tracing level
log_buffer6766592redo circular buffer size
log_checkpoint_interval0# redo blocks checkpoint threshold
log_checkpoint_timeout1800Maximum time interval between checkpoints in seconds
log_checkpoints_to_alertFALSElog checkpoint begin/end to alert file
log_file_name_convertlogfile name convert patterns and strings for standby/clone db
long_module_actionTRUEUse longer module and action
mandatory_user_profileEnforce Mandatory Password Profile for multitenant database
max_auth_servers25Maximum size of auth pool
max_datapump_jobs_per_pdb100maximum number of concurrent Data Pump Jobs per PDB
max_datapump_parallel_per_job50maximum number of parallel processes per Data Pump Job
max_dispatchersmax number of dispatchers
max_dump_file_sizeunlimitedMaximum size (in bytes) of dump file
max_idle_blocker_time0maximum idle time for a blocking session in minutes
max_idle_time0maximum session idle time in minutes
max_iops0MAX IO per second
max_mbps0MAX MB per second
max_pdbs254max number of pdbs allowed in CDB or Application ROOT
max_shared_serversmax number of shared servers
max_string_sizeSTANDARDcontrols maximum size of VARCHAR2, NVARCHAR2, and RAW types in SQL
memoptimize_pool_size0Size of cache for imoltp buffers
memory_max_target0Max size for Memory Target
memory_target0Target size of Oracle SGA and PGA memory
min_auth_servers1Minimum size of auth pool
multishard_query_data_consistencystrongconsistency setting for multishard queries
multishard_query_partial_resultsnot allowedenable partial results for multishard queries
native_blockchain_featuresNative block chain enable/disable
nls_calendarGREGORIANNLS calendar system name
nls_compBINARYNLS comparison
nls_currency$NLS local currency symbol
nls_date_formatDD-MON-RRNLS Oracle date format
nls_date_languageAMERICANNLS date language name
nls_dual_currency$Dual currency symbol
nls_iso_currencyAMERICANLS ISO currency territory name
nls_languageAMERICANNLS language name
nls_length_semanticsBYTEcreate columns using byte or char semantics by default
nls_nchar_conv_excpFALSENLS raise an exception instead of allowing implicit conversion
nls_numeric_characters.,NLS numeric characters
nls_sortBINARYNLS linguistic definition name
nls_territoryAMERICANLS territory name
nls_time_formatHH.MI.SSXFF AMtime format
nls_time_tz_formatHH.MI.SSXFF AM TZRtime with timezone format
nls_timestamp_formatDD-MON-RR HH.MI.SSXFF AMtime stamp format
nls_timestamp_tz_formatDD-MON-RR HH.MI.SSXFF AM TZRtimestamp with timezone format
noncdb_compatibleFALSENon-CDB Compatible
object_cache_max_size_percent10percentage of maximum size over optimal of the user session's object cache
object_cache_optimal_size10240000optimal size of the user session's object cache in bytes
ofs_threads4Number of OFS threads
olap_page_pool_size0size of the olap page pool in bytes
one_step_plugin_for_pdb_with_tdeFALSEFacilitate one-step plugin for PDB with TDE encrypted data
open_cursors300max # cursors per session
open_links4max # open links per session
open_links_per_instance4max # open links per instance
optimizer_adaptive_plansTRUEcontrols all types of adaptive plans
optimizer_adaptive_reporting_onlyFALSEuse reporting-only mode for adaptive optimizations
optimizer_adaptive_statisticsFALSEcontrols all types of adaptive statistics
optimizer_capture_sql_plan_baselinesFALSEautomatic capture of SQL plan baselines for repeatable statements
optimizer_capture_sql_quarantineFALSEenable automatic creation/update of sql quarantine configuration
optimizer_cross_shard_resiliencyFALSEenables resilient execution of cross shard queries
optimizer_dynamic_sampling2optimizer dynamic sampling
optimizer_features_enable21.1.0optimizer plan compatibility parameter
optimizer_ignore_hintsFALSEenables the embedded hints to be ignored
optimizer_ignore_parallel_hintsFALSEenables embedded parallel hints to be ignored
optimizer_index_caching0optimizer percent index caching
optimizer_index_cost_adj100optimizer index cost adjustment
optimizer_inmemory_awareTRUEoptimizer in-memory columnar awareness
optimizer_modeALL_ROWSoptimizer mode
optimizer_real_time_statisticsFALSEoptimizer real time statistics on conventional DML
optimizer_secure_view_mergingTRUEoptimizer secure view merging and predicate pushdown/movearound
optimizer_session_typeNORMALControls Auto Index
optimizer_use_invisible_indexesFALSEUsage of invisible indexes (TRUE/FALSE)
optimizer_use_pending_statisticsFALSEControl whether to use optimizer pending statistics
optimizer_use_sql_plan_baselinesTRUEuse of SQL plan baselines for captured sql statements
optimizer_use_sql_quarantineTRUEenable use of sql quarantine
os_authent_prefixops$prefix for auto-logon accounts
os_rolesFALSEretrieve roles from the operating system
outbound_dblink_protocolsALLOutbound DBLINK Protocols allowed
parallel_adaptive_multi_userFALSEenable adaptive setting of degree for multiple user streams
parallel_degree_limitCPUlimit placed on degree of parallelism
parallel_degree_policyMANUALpolicy used to compute the degree of parallelism (MANUAL/LIMITED/AUTO/ADAPTIVE)
parallel_execution_message_size16384message buffer size for parallel execution
parallel_force_localFALSEforce single instance execution
parallel_instance_groupinstance group to use for all parallel operations
parallel_max_servers80maximum parallel query servers per instance
parallel_min_degree1controls the minimum DOP computed by Auto DOP
parallel_min_percent0minimum percent of threads required for parallel query
parallel_min_servers1minimum parallel query servers per instance
parallel_min_time_thresholdAUTOthreshold above which a plan is a candidate for parallelization (in seconds)
parallel_servers_target80instance target in terms of number of parallel servers
parallel_threads_per_cpu1number of parallel execution threads per CPU
pdb_file_name_convertPDB file name convert patterns and strings for create cdb/pdb
pdb_lockdownpluggable database lockdown profile
pdb_os_credentialpluggable database OS credential to bind
pdb_templatePDB template
permit_92_wrap_formatFALSEallow 9.2 or older wrap format in PL/SQL
pga_aggregate_limit2147483648limit of aggregate PGA memory for the instance or PDB
pga_aggregate_target800063488Target size for the aggregate PGA memory consumed by the instance
pkcs11_library_locationPKCS#11 library location for Transparent Data Encryption
plscope_settingsIDENTIFIERS:NONEplscope_settings controls the compile time collection, cross reference, and storage of PL/SQL source code identifier and SQL statement data
plsql_ccflagsPL/SQL ccflags
plsql_code_typeINTERPRETEDPL/SQL code-type
plsql_debugFALSEPL/SQL debug
plsql_optimize_level2PL/SQL optimize level
plsql_v2_compatibilityFALSEPL/SQL version 2.x compatibility flag
plsql_warningsDISABLE:ALLPL/SQL compiler warnings settings
pmem_filestorePersistent Memory Filestore list
pre_page_sgaTRUEpre-page sga for process
private_temp_table_prefixORA$PTT_Private temporary table prefix
processes320user processes
processor_group_nameName of the processor group that this instance should run in.
query_rewrite_enabledTRUEallow rewrite of queries using materialized views if enabled
query_rewrite_integrityenforcedperform rewrite using materialized views with desired integrity
rdbms_server_dnRDBMS's Distinguished Name
read_onlyFALSERestrict WRITE operations in user session
read_only_open_delayedFALSEif TRUE delay opening of read only files until first access
recovery_parallelism0number of server processes to use for parallel recovery
recyclebinonrecyclebin processing
redo_transport_userData Guard transport user when using password file
remote_dependencies_modeTIMESTAMPremote-procedure-call dependencies mode parameter
remote_listenerremote listener
remote_login_passwordfileEXCLUSIVEpassword file usage parameter
remote_os_rolesFALSEallow non-secure remote clients to use os roles
remote_recovery_file_destdefault remote database recovery file location for refresh/relocate
replication_dependency_trackingTRUEtracking dependency for Replication parallel propagation
resource_limitTRUEmaster switch for resource limit
resource_manage_goldengateFALSEgoldengate resource manager enabled
resource_manager_cpu_allocation0Resource Manager CPU allocation
resource_manager_cpu_scopeINSTANCE_ONLYscope of CPU resource management
resource_manager_planSCHEDULER[0x52C4]:DEFAULT_MAINTENANCE_PLANresource mgr top plan
result_cache_execution_threshold2minimum executions before a PL/SQL function is cached
result_cache_max_result5maximum result size as percent of cache size
result_cache_max_size12058624maximum amount of memory to be used by the cache
result_cache_max_temp_result5maximum temp per result as percent of total temp for result cache
result_cache_max_temp_size120586240maximum amount of temp space to be used
result_cache_modeMANUALresult cache operator usage mode
result_cache_remote_expiration0maximum life time (min) for any result using a remote object
resumable_timeout0set resumable_timeout
rollback_segmentsundo segment list
scheduler_follow_pdbtzFALSEMake scheduler objects follow PDB TZ
sec_max_failed_login_attempts3maximum number of failed login attempts on a connection
sec_protocol_error_further_action(DROP,3)TTC protocol error continue action
sec_protocol_error_trace_actionTRACETTC protocol error action
sec_return_server_release_bannerFALSEwhether the server retruns the complete version information
serial_reusedisablereuse the frame segments
service_namesorcl21cservice names supported by the instance
session_cached_cursors50Number of cursors to cache in a session.
session_max_open_files10maximum number of open files allowed per session
sessions504user and system sessions
sga_max_size2399141888max total SGA size
sga_min_size0Minimum, guaranteed size of PDB's SGA
sga_target2399141888Target size of SGA
shadow_core_dumppartialCore Size for Shadow Processes
shard_queries_restricted_by_keyFALSEadd shard key predicates to the query
shared_memory_address0SGA starting address (low order 32-bits on 64-bit platforms)
shared_pool_reserved_size46976204size in bytes of reserved area of shared pool
shared_pool_size0size in bytes of shared pool
shared_server_sessionsmax number of shared server sessions
shared_servers1number of shared servers to start up
shrd_dupl_table_refresh_rate60duplicated table refresh rate (in seconds)
skip_unusable_indexesTRUEskip unusable indexes if set to TRUE
smtp_out_serverutl_smtp server and port configuration parameter
sort_area_retained_size0size of in-memory sort work area retained between fetch calls
sort_area_size65536size of in-memory sort work area
spatial_vector_accelerationTRUEenable spatial vector acceleration
spfile/u01/app/oracle/dbs/spfileorcl21c.oraserver parameter file
sql92_securityTRUErequire select privilege for searched update/delete
sql_traceFALSEenable SQL trace
sqltune_categoryDEFAULTCategory qualifier for applying hintsets
ssl_walletssl_wallet
standby_db_preserve_statesNONEPreserve state cross standby role transition
standby_file_managementMANUALif auto then files are created/dropped automatically on standby
standby_pdb_source_file_dblinkdatabase link to standby source files
standby_pdb_source_file_directorystandby source file directory location
star_transformation_enabledFALSEenable the use of star transformation
statistics_levelTYPICALstatistics level
streams_pool_size0size in bytes of the streams pool
tablespace_encryption_default_algorithmAES128default tablespace encryption block cipher mode
tape_asynch_ioTRUEUse asynch I/O requests for tape devices
target_pdbs4Parameter is a hint to adjust certain attributes of the CDB
tde_configurationPer-PDB configuration for Transparent Data Encryption
tde_key_cacheFALSEEnable caching of TDE intermediate key
temp_undo_enabledFALSEis temporary undo enabled
thread0Redo thread to mount
threaded_executionFALSEThreaded Execution Mode
timed_os_statistics0internal os statistic gathering interval in seconds
timed_statisticsTRUEmaintain internal timing statistics
timezone_version_upgrade_onlineFALSEenable/disable time zone version upgrade online
trace_enabledTRUEenable in memory tracing
tracefile_identifiertrace file custom identifier
transactions554max. number of concurrent active transactions
transactions_per_rollback_segment5number of active transactions per rollback segment
undo_managementAUTOinstance runs in SMU mode if TRUE, else in RBU mode
undo_retention900undo retention in seconds
undo_tablespaceUNDOTBS1use/switch undo tablespace
unified_audit_common_systemlogSyslog facility and level for only common unified audit records
unified_audit_systemlogSyslog facility and level for Unified Audit
uniform_log_timestamp_formatTRUEuse uniform timestamp formats vs pre-12.2 formats
use_dedicated_brokerFALSEUse dedicated connection broker
use_large_pagesTRUEUse large pages if available (TRUE/FALSE/ONLY)
user_dump_dest/u01/app/oracle/homes/OraDB21Home1/rdbms/logUser process dump directory
wallet_rootwallet root instance initialization parameter
workarea_size_policyAUTOpolicy used to size SQL working areas (MANUAL/AUTO)
xml_db_eventsenableare XML DB events enabled

Double-Underscore(__)) parameters in 21c:

Double Underscore parameters are memory snapsnot values in current database, and allow database to restore previous self-tuned values across database restart.

SELECT /*+ use_hash(x y) */
    ksppinm name,
    ksppstvl value,
    ksppdesc description
FROM
    x$ksppi    x,
    x$ksppcv   y
WHERE
    ( x.indx = y.indx )
    AND bitand(ksppiflg, 268435456) = 0
    AND ksppinm like '\_\_%' escape '\'
ORDER BY ksppinm;
namevaluedescription
__asm_max_connected_clients3The high water mark value for connected clients
__data_transfer_cache_size0Actual size of data transfer cache
__db_16k_cache_xmem_size_metadata0Size of extended cache metadata for 16k buffer pool
__db_2k_cache_xmem_size_metadata0Size of extended cache metadata for 2k buffer pool
__db_32k_cache_xmem_size_metadata0Size of extended cache metadata for 32k buffer pool
__db_4k_cache_xmem_size_metadata0Size of extended cache metadata for 4k buffer pool
__db_8k_cache_xmem_size_metadata0Size of extended cache metadata for 8k buffer pool
__db_cache_size1056964608Actual size of DEFAULT buffer pool for standard block size buffers
__db_cache_xmem_size_metadata0Size of extended memory metadata of DEFAULT buffer pool for standard block size buffers
__db_keep_cache_xmem_size_metadata0Size of extended cache metadata of KEEP buffer pool for standard block size buffers
__db_pmem_direct_map_size_metadata0Size of PMEM memory metadata of DEFAULT buffer pool for standard block size buffers
__db_recycle_cache_xmem_size_metadata0Size of extended memory metadata of recycle buffer pool for standard block size buffers
__dg_broker_service_namesservice names for broker use
__inmemory_ext_roarea0Actual size in bytes of inmemory ro extension area
__inmemory_ext_rwarea0Actual size in bytes of inmemory rw extension area
__java_pool_size150994944Actual size in bytes of java pool
__large_pool_size16777216Actual size in bytes of large pool
__latch_test_param0latch test parameter
__maintenance_is_planned0Is maintenance scheduled soon?
__memoptimize_xmem_pool_size_metadata0Size of extended cache metadata of MEMOPTIMIZE buffer pool for standard block size buffers
__oracle_base/u01/app/oracleORACLE_BASE
__persistent_cl2_slave_size0Actual size of slave cluster flash cache for default block size
__pga_aggregate_target805306368Current target size for the aggregate PGA memory consumed
__reload_lsnr0reload listener
__sess_template_test_attrsFALSEsession template: include test attributes
__sga_current_size0Current size for PDB SGA
__sga_target2399141888Actual size of SGA
__shared_io_pool_size117440512Actual size of shared IO pool
__shared_pool_size1006632960Actual size in bytes of shared pool
__streams_pool_size33554432Actual size in bytes of streams pool
__unified_pga_pool_size0Actual size in bytes of unified pga pool
__wait_test_param0wait test parameter
Posted by Luo Donghua at 9:25 PM
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