Monday, September 28, 2026

Hidden Parameters in Oracle AI Database 26ai H.6 OLAP / analytic views (206)

 

H.6 OLAP / analytic views (206)

NameTypeValueAt default?LevelPDBRAC inst.FlagsDescription
_hcs_catalog_test_insertBooleanFALSEyesSESSIONYYtest catalog insert
_hcs_disable_all_pruneBooleanFALSEyesSESSIONYYprune hierarchies pinned to ALL level
_hcs_disable_all_qry_optzBooleanFALSEyesSESSIONYYskip all query optimization on generated SQL
_hcs_disable_av_jback_optBooleanFALSEyesSESSIONYYoptimize analytic view query joinback
_hcs_disable_av_sql_hintBooleanFALSEyesSESSIONYYdisable analytic view sql hint
_hcs_disable_basetbl_transformBooleanFALSEyesSESSIONYYdisable base table transform
_hcs_disable_bd_agg_optBooleanFALSEyesSESSIONYYoptimize base data aggregation
_hcs_disable_calc_dtm_to_out_optBooleanFALSEyesSESSIONYYapply move calc determined hier to output hier optimization
_hcs_disable_calc_optBooleanFALSEyesSESSIONYYcalc optimize
_hcs_disable_calc_union_optBooleanFALSEyesSESSIONYYdisable calc union optimization
_hcs_disable_cell_qry_atr_prune_optBooleanFALSEyesSESSIONYYapply attribute prune optimization to cell query
_hcs_disable_cell_qry_lvl_prune_optBooleanFALSEyesSESSIONYYapply level prune optimization to cell query
_hcs_disable_cell_qry_mv_cache_optBooleanFALSEyesSESSIONYYapply mv cache optimization to cell query
_hcs_disable_cell_qry_no_calc_nav_optBooleanFALSEyesSESSIONYYapply no calc navigation optimization to cell query
_hcs_disable_cell_qry_no_out_data_optBooleanFALSEyesSESSIONYYapply no output data optimization to cell query
_hcs_disable_col_prune_optzBooleanFALSEyesSESSIONYYskip column pruning optimization on generated SQL
_hcs_disable_dt_opt_cell_qryBooleanFALSEyesSESSIONYYdisable cell query optimizations for datatype queries
_hcs_disable_dtmall_optBooleanFALSEyesSESSIONYYdisable determine all optimization
_hcs_disable_dup_nav_calc_optBooleanFALSEyesSESSIONYYduplicate navigation calc optimize
_hcs_disable_dup_src_tbl_optBooleanFALSEyesSESSIONYYapply duplicate src table optimization
_hcs_disable_exists_distinctBooleanFALSEyesSESSIONYYno exists distinct
_hcs_disable_filter_hierarchiesBooleanFALSEyesSESSIONYYfilter hierarchies in hcs queries
_hcs_disable_fltr_below_fltr_star_optBooleanFALSEyesSESSIONYYapply filter below filtered star optimization
_hcs_disable_fltr_fact_optBooleanFALSEyesSESSIONYYapply filtered fact optimization
_hcs_disable_fltr_hier_star_optBooleanFALSEyesSESSIONYYapply filtered hierarchy star optimization
_hcs_disable_hier_join_map_nonnullBooleanFALSEyesSESSIONYYno hier join map non null
_hcs_disable_inline_tmpl_optBooleanFALSEyesSESSIONYYapply inline single ref top blocks optimization to cell query
_hcs_disable_latest_compat_checkBooleanFALSEyesSESSIONYYskip compatibility check for latest compatible version
_hcs_disable_level_ordBooleanFALSEyesSESSIONYYprune away MAX(MAX(...)) around level order columns
_hcs_disable_level_pruneBooleanFALSEyesSESSIONYYperform all level pruning
_hcs_disable_level_prune_calc_data_joinsBooleanFALSEyesSESSIONYYperform level pruning for joins across calc data
_hcs_disable_level_prune_hier_joinBooleanFALSEyesSESSIONYYperform level pruning from hierarchy joins
_hcs_disable_level_prune_hier_qryBooleanFALSEyesSESSIONYYperform level pruning from hierarchy queries
_hcs_disable_level_prune_hierarchizeBooleanFALSEyesSESSIONYYlevel prune hierarchize
_hcs_disable_level_prune_in_qryBooleanFALSEyesSESSIONYYperform level pruning from level IN conditions
_hcs_disable_level_prune_mbr_lookupBooleanFALSEyesSESSIONYYperform level pruning in member lookup queries
_hcs_disable_lvl_vis_lvs_no_tgts_optBooleanFALSEyesSESSIONYYdisable level visible leaves no targets optimization
_hcs_disable_materializeBooleanFALSEyesSESSIONYYadd materialize to result cache hint
_hcs_disable_mdx_cache_hintBooleanFALSEyesSESSIONYYgenerate hcs query mdx cache hints
_hcs_disable_merge_fltr_star_optBooleanFALSEyesSESSIONYYdisable merge filter star optimization
_hcs_disable_mv_dense_join_optBooleanFALSEyesSESSIONYYdisable move dense join optimization
_hcs_disable_mv_reparse_optBooleanFALSEyesSESSIONYYdisable mv reparse optimization
_hcs_disable_mv_rewrite_checkBooleanFALSEyesSESSIONYYskip MV rewrite check when generating for ANALYTIC VIEW cache
_hcs_disable_no_bdfltrd_optBooleanFALSEyesSESSIONYYapply no base data filtered optimization
_hcs_disable_obj_cache_nameBooleanFALSEyesSESSIONYYDo not include the object number in an aggregate or level cache
_hcs_disable_opt_cell_qryBooleanFALSEyesSESSIONYYoptimize cell query
_hcs_disable_opt_estimateBooleanFALSEyesSESSIONYYgenerate opt estimate hints
_hcs_disable_prune_star_joins_optBooleanFALSEyesSESSIONYYskip prune star joins optimization
_hcs_disable_prune_unslvd_star_optBooleanFALSEyesSESSIONYYdisable prune unsolved star optimization
_hcs_disable_remote_catalogBooleanFALSEyesSESSIONYYdisable remote catalog
_hcs_disable_remoteaggr_optBooleanFALSEyesSESSIONYYdisable remote aggr optimization
_hcs_disable_result_cache_hintBooleanFALSEyesSESSIONYYgenerate hcs query result cache hints
_hcs_disable_rm_agg_tgt_n_mdxqry_optBooleanFALSEyesSESSIONYYdisable remove aggregation targets from no mdx qry optimization
_hcs_disable_rm_unused_withs_optzBooleanFALSEyesSESSIONYYskip unused WITH element removal optimization on generated SQL
_hcs_disable_smooth_descendantsBooleanFALSEyesSESSIONYYperform smooth descendants
_hcs_disable_smooth_drill_allBooleanFALSEyesSESSIONYYperform smooth drill all
_hcs_disable_smooth_hierarchizeBooleanFALSEyesSESSIONYYperform hierarchize smoothing
_hcs_disable_smooth_noop_descendantsBooleanFALSEyesSESSIONYYperform smooth no-op descendants
_hcs_disable_smooth_remove_allBooleanFALSEyesSESSIONYYsmooth and remove ALL member
_hcs_disable_use_cache_star_optBooleanFALSEyesSESSIONYYdisable use cache star optimization
_hcs_disable_vector_transformBooleanFALSEyesSESSIONYYdisable vector transform hint
_hcs_disable_view_mergeBooleanFALSEyesSESSIONYYdisable view merge
_hcs_disable_vis_totalsBooleanFALSEyesSESSIONYYgenerate visual totals
_hcs_disable_xjoin_tgt_depths_optBooleanFALSEyesSESSIONYYdisable xjoin target depths optimization
_hcs_enable_aggr_opt_estimateBooleanFALSEyesSESSIONYYapply OPT_ESTIMATE hint to aggregation queries
_hcs_enable_all_distinctBooleanFALSEyesSESSIONYYuse distinct instead of rownum=1
_hcs_enable_av_auto_cacheBooleanTRUEyesSESSIONYYenable AV auto-cache
_hcs_enable_code_trc_call_stackBooleanFALSEyesSESSIONYYenable code trace stack
_hcs_enable_cube_joinBooleanFALSEyesSESSIONYYenable cube join
_hcs_enable_error_on_no_transformBooleanFALSEyesSESSIONYYenable error on no transform
_hcs_enable_expose_with_exprBooleanFALSEyesSESSIONYYexpose internal with_expression
_hcs_enable_fusion_codeBooleanFALSEyesSESSIONYYenable avtune legacy code path for Fusion
_hcs_enable_in_mem_cdt_hintBooleanFALSEyesSESSIONYYadd hint opt_param('_in_memory_cdt', 'off')
_hcs_enable_listagg_orderBooleanFALSEyesSESSIONYYenable listagg order
_hcs_enable_mdx_cache_name_colBooleanFALSEyesSESSIONYYadd column for mdx cache name
_hcs_enable_mdx_mv_genBooleanFALSEyesSESSIONYYenable mdx mv cache SQL generation
_hcs_enable_mdx_sleep_after_pinBooleanFALSEyesSESSIONYYsleep after pinning MDX caches
_hcs_enable_mem_code_trcBooleanFALSEyesSESSIONYYenable memory code tracing
_hcs_enable_multi_parent_optBooleanFALSEyesSESSIONYYenable multi-parent optimization
_hcs_enable_no_expandBooleanFALSEyesSESSIONYYenable no expand hint
_hcs_enable_parallel_hintBooleanFALSEyesSESSIONYYinclude parallel hint in cell query
_hcs_enable_pred_pushBooleanTRUEyesSESSIONYYenable optimizer AV predicate pushing via reparse
_hcs_enable_time_code_trcBooleanFALSEyesSESSIONYYenable timing code tracing
_hcs_enable_unref_top_chkBooleanFALSEyesSESSIONYYenable check for unref top blocks
_hcs_enable_unsupported_calcsBooleanFALSEyesSESSIONYYenable unsupported calcs
_hcs_log_max_segmentsInteger1000yesSYSTEM imm.YYmaximum number of HCS log segments, 0 for unlimited
_hcs_log_segment_sizeInteger10yesSYSTEM imm.YYHCS log segment size in MB
_hcs_loggingStringSUMMARYyesSESSIONYYanalytic view logging
_hcs_mdx_sim_sga_alloc_errStringNONEyesSESSIONYYsimulate mdx sga allocation error
_hcs_mdx_sim_so_failBooleanFALSEyesSESSIONYYsimulate state object failure
_hcs_mdx_sleep_locStringNONEyesSESSIONYYmdx location to sleep for testing
_hcs_purge_dims_hiersBooleanFALSEyesSESSIONYYpurge dims and hiers on DDL operations
_hcs_query_hintStringyesSESSIONYYquery hint
_hcs_raise_unexpected_catalog_errorBooleanFALSEyesSESSIONYYraise unexpected catalog error
_hcs_remote_catalog_versionStringLATESTyesSESSIONYYremote catalog version
_hcs_sim_catalog_bad_userBooleanFALSEyesSESSIONYYsimulate catalog bad user
_hcs_sim_catalog_errorBooleanFALSEyesSESSIONYYsimulate catalog error
_hcs_sim_no_addrowBooleanFALSEyesSESSIONYYsimulates missing add row metadata
_hcs_sim_no_chgtrckBooleanFALSEyesSESSIONYYsimulates missing change tracking table metadata
_hcs_sim_no_cont_objBooleanFALSEyesSESSIONYYsimulates missing container_obj# metadata
_hcs_sim_no_denseBooleanFALSEyesSESSIONYYsimulates missing dense metadata
_hcs_sim_no_dim_outer_joinBooleanFALSEyesSESSIONYYsimulates missing dimension outer join metadata
_hcs_sim_no_joinrelBooleanFALSEyesSESSIONYYsimulates missing join relationship metadata
_hcs_sim_no_qual_exprBooleanFALSEyesSESSIONYYsimulates missing qual_expr row in hcs_av_meas$
_hcs_sim_no_trstdcnstBooleanFALSEyesSESSIONYYsimulates missing trusted constraints metadata
_hcs_sim_pga_expr_parse_errBooleanFALSEyesSESSIONYYsimulate PGA expression parse error
_hcs_sim_sqlopt_errBooleanFALSEyesSESSIONYYsimulate sql optimization error
_hcs_stats_max_cardInteger2000000yesSESSIONYYmaximum value for stats cardinality
_olap_adv_comp_stats_cc_precompInteger20yesSESSIONYYdo additional predicate stats analysis for AW rowsource
_olap_adv_comp_stats_max_rowsInteger100000yesSESSIONYYdo additional predicate stats analysis for AW rowsource
_olap_aggregate_buffer_sizeInteger1048576yesSESSIONYYOLAP Aggregate max buffer size
_olap_aggregate_flagsInteger0yesSESSIONYYOLAP Aggregate debug flags
_olap_aggregate_function_cache_enabledBooleanTRUEyesSESSIONYYOLAP Aggregate function cache enabled
_olap_aggregate_max_thread_tuplesInteger5000yesSESSIONYYOLAP Aggregate max thread tuples creation
_olap_aggregate_min_buffer_sizeInteger1024yesSESSIONYYOLAP Aggregate min buffer size
_olap_aggregate_min_thread_statusInteger64yesSESSIONYYOLAP Aggregate minimum cardinality of dimensions for thread
_olap_aggregate_multipath_hierBooleanFALSEyesSESSIONYYOLAP Aggregate Multi-path Hierarhies enabled
_olap_aggregate_statlen_threshInteger1024yesSESSIONYYOLAP Aggregate status array usage threshold
_olap_aggregate_work_per_threadInteger1024yesSESSIONYYOLAP Aggregate max work parents
_olap_aggregate_worklist_maxInteger5000yesSESSIONYYOLAP Aggregate max worklists generated at once
_olap_allocate_errorlog_formatString%8p %8y %8z %e (%n)yesSESSIONYYOLAP Allocate Errorlog Format
_olap_allocate_errorlog_headerStringDim Source Basis %-8d %-8s %-8b Description -------- ------…yesSESSIONYYOLAP Allocate Errorlog Header format
_olap_analyze_maxInteger10000yesSESSIONYYOLAP DML ANALYZE command max cells to analyze
_olap_continuous_trace_fileStringfalseyesSESSIONYYOLAP logging definition
_olap_dbgoutfile_echo_to_eventlogBooleanFALSEyesSESSIONYYOLAP DbgOutfile copy output to event log (tracefile)
_olap_dimension_corehash_forceBooleanFALSEyesSESSIONYYOLAP Dimension In-Core Hash Table Force
_olap_dimension_corehash_largeInteger50000yesSESSIONYYOLAP Dimension In-Core Hash Table Large Threshold
_olap_dimension_corehash_pressureInteger90yesSESSIONYYOLAP Dimension In-Core Hash Table Pressure Threshold
_olap_dimension_corehash_sizeInteger30yesSESSIONYYOLAP Dimension In-Core Hash Table Maximum Memory Use
_olap_eif_export_lob_sizeInteger2147483647yesSESSIONYYOLAP EIF Export BLOB size
_olap_lmgen_dim_sizeInteger100yesSESSIONYYLimitmap generator dimension column size
_olap_lmgen_meas_sizeInteger1000yesSESSIONYYLimitmap generator measure column size
_olap_object_hash_classInteger3yesSESSIONYYOLAP Object Hash Table Class
_olap_page_pool_expand_rateInteger20yesSESSIONYYOLAP Page Pool Expand Rate
_olap_page_pool_hiInteger50yesSESSIONYYOLAP Page Pool High Watermark
_olap_page_pool_hit_targetInteger100yesSESSIONYYOLAP Page Pool Hit Target
_olap_page_pool_lowInteger262144yesSESSIONYYOLAP Page Pool Low Watermark
_olap_page_pool_pressureInteger90yesSESSIONYYOLAP Page Pool Pressure Threshold
_olap_page_pool_shrink_rateInteger50yesSESSIONYYOLAP Page Pool Shrink Rate
_olap_parallel_update_server_numInteger0yesSESSIONYYOLAP parallel update server count
_olap_parallel_update_small_thresholdInteger1000yesSESSIONYYOLAP parallel update threshold for number of small pagespaces
_olap_parallel_update_thresholdInteger1000yesSESSIONYYOLAP parallel update threshold in pages
_olap_row_load_time_precisionStringDEFAULTyesSESSIONYYOLAP Row Load Time Precision
_olap_sesscache_enabledBooleanTRUEyesSESSIONYYOLAP Session Cache knob
_olap_sort_buffer_pctInteger10yesSESSIONYYOLAP Sort Buffer Size Percentage
_olap_sort_buffer_sizeInteger262144yesSESSIONYYOLAP Sort Buffer Size
_olap_statbool_corebitsInteger20000000yesSESSIONYYOLAP Status Boolean max incore bits
_olap_statbool_thresholdInteger8100yesSESSIONYYOLAP Status Boolean CBM threshold
_olap_table_function_statisticsBooleanFALSEyesSESSIONYYSpecify TRUE to output OLAP table function timed statistics trace
_olap_wrap_errorsBooleanFALSEyesSESSIONYYWrap error messages to OLAP outfile
_olapi_history_retentionBooleanFALSEyesSYSTEM imm.NYenable olapi history retention
_olapi_iface_object_historyInteger1000yesSTATICNNenable olapi interface object history collection
_olapi_iface_object_history_retentionBooleanFALSEyesSYSTEM imm.NYenable olapi interface object history retention
_olapi_iface_operation_history_retentionBooleanFALSEyesSYSTEM imm.NYenable olapi interface operation history retention
_olapi_interface_operation_historyInteger1000yesSTATICNNenable olapi interface operation history collection
_olapi_memory_operation_historyInteger1000yesSTATICNNenable olapi memory alloc/free history collection
_olapi_memory_operation_history_pause_at_seqnoInteger0yesSYSTEM imm.NYenable olapi memory alloc/free history collection pausing
_olapi_memory_operation_history_retentionBooleanFALSEyesSYSTEM imm.NYenable olapi memory operation history retention
_olapi_session_historyInteger300yesSTATICNNenable olapi session history collection
_olapi_session_history_retentionBooleanFALSEyesSYSTEM imm.NYenable olapi session history retention
_xsolapi_auto_materialization_boundInteger20yesSESSIONYYOLAP API lower bound for auto materialization.
_xsolapi_auto_materialization_typeStringPRED_AND_RCyesSESSIONYYOLAP API behavior for auto materialization
_xsolapi_build_traceBooleanFALSEyesSESSIONYYOLAP API output build info to trace file
_xsolapi_debug_outputStringSUPPRESSyesSESSIONYYOLAP API debug output disposition
_xsolapi_densify_cubesStringTABULARyesSESSIONYYOLAP API cube densification
_xsolapi_dimension_group_creationStringOVERFETCHyesSESSIONYYOLAP API symmetric overfetch
_xsolapi_dml_traceStringyesSESSIONYYOLAP API output dml commands and expressions to trace file
_xsolapi_fetch_typeStringPARTIALyesSESSIONYYOLAP API fetch type
_xsolapi_fix_vptrsBooleanTRUEyesSYSTEM imm.NYOLAP API Enable vptr fixing logic in shared server mode
_xsolapi_generate_with_clauseBooleanFALSEyesSESSIONYYOLAP API generates WITH clause?
_xsolapi_hierarchy_value_typeStringuniqueyesSESSIONYYOLAP API hierarchy value type
_xsolapi_load_at_process_startStringNEVERyesSESSIONYYWhen to load OLAP API library at server process start
_xsolapi_materialization_rowcache_min_rows_for_useInteger1yesSESSIONYYOLAP API min number of rows required to use rowcache in query materialization
_xsolapi_materialize_sourcesBooleanTRUEyesSESSIONYYOLAP API Enable source materialization
_xsolapi_metadata_reader_modeStringDEFAULTyesSESSIONYYOLAP API metadata reader mode
_xsolapi_odbo_modeBooleanFALSEyesSESSIONYYOLAP API uses ODBO mode?
_xsolapi_opt_aw_positionBooleanTRUEyesSESSIONYYOLAP API enables AW position and count optimization?
_xsolapi_precompute_subqueryBooleanTRUEyesSESSIONYYOLAP API precomputes subqueries?
_xsolapi_remove_columns_for_materializationBooleanTRUEyesSESSIONYYOLAP API removes columns for materialization?
_xsolapi_set_nlsBooleanTRUEyesSESSIONYYOLAP API sets NLS?
_xsolapi_share_executorsBooleanTRUEyesSESSIONYYOLAP API share executors?
_xsolapi_source_traceBooleanFALSEyesSESSIONYYOLAP API output Source definitions to trace file
_xsolapi_sql_all_multi_join_non_base_hintsStringyesSESSIONYYOLAP API multi-join non-base hints
_xsolapi_sql_all_non_base_hintsStringyesSESSIONYYOLAP API non-base hints
_xsolapi_sql_auto_dimension_hintsBooleanFALSEyesSESSIONYYOLAP API enable automatic dimension hints
_xsolapi_sql_auto_measure_hintsBooleanTRUEyesSESSIONYYOLAP API enable automatic measure hints
_xsolapi_sql_dimension_hintsStringyesSESSIONYYOLAP API dimension hints
_xsolapi_sql_enable_aw_joinBooleanTRUEyesSESSIONYYOLAP API enables AW join?
_xsolapi_sql_enable_aw_qdr_mergeBooleanTRUEyesSESSIONYYOLAP API enables AW QDR merge?
_xsolapi_sql_hintsStringyesSESSIONYYOLAP API generic hints
_xsolapi_sql_measure_hintsStringyesSESSIONYYOLAP API measure hints
_xsolapi_sql_minus_thresholdInteger1000yesSESSIONYYOLAP API SQL MINUS threshold
_xsolapi_sql_prepare_stmt_cache_sizeInteger16yesSESSIONYYOLAP API prepare statement cache size
_xsolapi_sql_remove_columnsBooleanTRUEyesSESSIONYYOLAP API enable remove unused columns optimizations
_xsolapi_sql_result_set_cache_sizeInteger32yesSESSIONYYOLAP API result set cache size
_xsolapi_sql_symmetric_predicateBooleanTRUEyesSESSIONYYOLAP API enable symmetric predicate for dimension groups
_xsolapi_sql_top_dimension_hintsStringyesSESSIONYYOLAP API top dimension hints
_xsolapi_sql_top_measure_hintsStringyesSESSIONYYOLAP API top measure hints
_xsolapi_sql_use_bind_variablesBooleanTRUEyesSESSIONYYOLAP API enable bind variables optimization
_xsolapi_stringify_order_levelsBooleanFALSEyesSESSIONYYOLAP API stringifies order levels?
_xsolapi_support_mtmBooleanFALSEyesSESSIONYYOLAP API MTM mapping classes supported?
_xsolapi_suppression_aw_mask_thresholdInteger1000yesSESSIONYYOLAP API suppression AW mask threshold
_xsolapi_suppression_chunk_sizeInteger4000yesSESSIONYYOLAP API suppression chunk size
_xsolapi_use_modelsBooleanTRUEyesSESSIONYYOLAP API uses models?
_xsolapi_use_olap_dmlBooleanTRUEyesSESSIONYYOLAP API uses OLAP DML?
_xsolapi_use_olap_dml_for_rankBooleanTRUEyesSESSIONYYOLAP API uses OLAP DML for rank?

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