Oracle 10g R2 隠しパラメータ一覧

最近 oracle 10g のパラメータ周りでいろいろ調べることがあったのでその備忘録。oracle にはあらかじめ便利な view が幾つか用意されているので、view の名前と定義について調べる SQL について。

select view_name, view_definition from v$fixed_view_definition

oracle 10.2.0 で 770 もの view の定義が表示されます。自分の知らない以外と便利そうな view が隠されているかもしれないので一度見ておくと参考になるかも。次に、oracle の譽僖薀瓠璽燭鯢充┐垢 SQL について。

select KSPPINM  name, KSPPDESC description from X$KSPPI
where  substr(KSPPINM,1,1) = '_' order by KSPPINM;
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当然ながら、oracle は隠しパラメータの使用は推奨していません。が、実際は oracle のチューニングベンダーがいろいろ設定するときには隠しパラメータを利用することもよくあります。ってことで、oracle 10.2.0 の隠しパラメータの一覧ということで、先ほどの SQL の実行結果はこちら。

NAME DESCRIPTION
_4031_dump_bitvec bitvec to specify dumps prior to 4031 error
_4031_dump_interval Dump 4031 error once for each n-second interval
_4031_max_dumps Maximum number of 4031 dumps for this process
_4031_sga_dump_interval Dump 4031 SGA heapdump error once for each n-second interval
_4031_sga_max_dumps Maximum number of SGA heapdumps
_NUMA_instance_mapping Set of nodes that this instance should run on
_NUMA_pool_size aggregate size in bytes of NUMA pool
_PX_use_large_pool Use Large Pool as source of PX buffers
__db_cache_size Actual size of DEFAULT buffer pool for standard block size buffers
__dg_broker_service_names service names for broker use
__java_pool_size Actual size in bytes of java pool
__large_pool_size Actual size in bytes of large pool
__shared_pool_size Actual size in bytes of shared pool
__streams_pool_size Actual size in bytes of streams pool
_abort_recovery_on_join if TRUE, abort recovery on join reconfigurations
_accept_versions List of parameters for rolling operation
_active_standby_fast_reconfiguration if TRUE optimize dlm reconfiguration for active/standby OPS
_adaptive_direct_read Adaptive Direct Read
_adaptive_fetch_enabled enable/disable adaptive fetch in parallel group by
_add_stale_mv_to_dependency_list add stale mv to dependency list
_addm_auto_enable governs whether ADDM gets run automatically after every AWR snapshot
_addm_skiprules comma-separated list of ADDM nodes to skip
_addm_version_check governs whether ADDM checks the input AWR snapshot version
_adjust_literal_replacement If TRUE, we will adjust the SQL/PLUS output
_affinity_on enable/disable affinity at run time
_aiowait_timeouts Number of aiowait timeouts before error is reported
_alert_expiration seconds before an alert message is moved to exception queue
_alert_message_cleanup Enable Alert Message Cleanup
_alert_message_purge Enable Alert Message Purge
_alert_post_background Enable Background Alert Posting
_all_shared_dblinks treat all dblinks as shared
_allocate_creation_order should files be examined in creation order during allocation
_allocation_update_interval interval at which successful search in L1 should be updated
_allow_commutativity allow for commutativity of +, * when comparing expressions
_allow_error_simulation Allow error simulation for testing
_allow_level_without_connect_by allow level without connect by
_allow_read_only_corruption allow read-only open even if database is corrupt
_allow_resetlogs_corruption allow resetlogs even if it will cause corruption
_allow_terminal_recovery_corruption Finish terminal recovery even if it may cause corruption
_alternate_iot_leaf_block_split_points enable alternate index-organized table leaf-block split-points
_always_anti_join always use this method for anti-join when possible
_always_semi_join always use this method for semi-join when possible
_always_star_transformation always favor use of star transformation
_app_ctx_vers enable app ctx versioning
_aq_tm_scanlimit scan limit for Time Managers to clean up IOT
_arch_io_slaves ARCH I/O slaves
_array_update_vector_read_enabled Enable array update vector read
_ash_disk_filter_ratio Ratio of the number of in-memory samples to the number of samples actually written to disk
_ash_disk_write_enable To enable or disable Active Session History flushing
_ash_dummy_test_param Oracle internal dummy ASH parameter used ONLY for testing!
_ash_eflush_trigger The percentage above which if the in-memory ASH is full the emergency flusher will be triggered
_ash_enable To enable or disable Active Session sampling and flushing
_ash_sample_all To enable or disable sampling every connected session including ones waiting for idle waits
_ash_sampling_interval Time interval between two successive Active Session samples in millisecs
_ash_size To set the size of the in-memory Active Session History buffers
_asm_acd_chunks initial ACD chunks created
_asm_allow_only_raw_disks Discovery only raw devices
_asm_allow_resilver_corruption Enable disk resilvering for external redundancy
_asm_ausize allocation unit size
_asm_blksize metadata block size
_asm_disk_repair_time seconds to wait before dropping a failing disk
_asm_droptimeout timeout before offlined disks get dropped (in 3s ticks)
_asm_emulmax max number of concurrent disks to emulate I/O errors
_asm_emultimeout timeout before emulation begins (in 3s ticks)
_asm_kfdpevent KFDP event
_asm_libraries library search order for discovery
_asm_maxio Maximum size of individual I/O request
_asm_stripesize ASM file stripe size
_asm_stripewidth ASM file stripe width
_asm_wait_time Max/imum time to wait before asmb exits
_asmlib_test Osmlib test event
_asmsid ASM instance id
_assm_default ASSM default
_async_recovery_claims if TRUE, issue recovery claims asynchronously
_async_recovery_reads if TRUE, issue recovery reads asynchronously
_avoid_prepare if TRUE, do not prepare a buffer when the master is local
_awr_corrupt_mode AWR Corrupt Mode
_awr_disabled_flush_tables Disable flushing of specified AWR tables
_awr_flush_threshold_metrics Enable/Disable Flushing AWR Workload Metrics
_awr_flush_workload_metrics Enable/Disable Flushing AWR Workload Metrics
_awr_mmon_cpuusage Enable/disable AWR MMON CPU Usage Tracking
_awr_restrict_mode AWR Restrict Mode
_awr_sql_child_limit Setting for AWR SQL Child Limit
_b_tree_bitmap_plans enable the use of bitmap plans for tables w. only B-tree indexes
_backup_disk_io_slaves BACKUP Disk I/O slaves
_backup_io_pool_size memory to reserve from the large pool
_backup_kgc_bufsz specifies buffer size to be used for kgc compression
_backup_kgc_niters specifies number of iterations used for kgc compression
_backup_kgc_type specifies compression type used for kgc compression
_backup_ksfq_bufcnt number of the ksfq buffers used for backup/restore
_backup_ksfq_bufsz size of the ksfq buffer used for backup/restore
_backup_max_gap_size largest gap in an incremental/optimized backup buffer, in bytes
_bct_bitmaps_per_file number of bitmaps to store for each datafile
_bct_buffer_allocation_max maximum size of all change tracking buffer allocations, in bytes
_bct_buffer_allocation_min_extents mininum number of extents to allocate per buffer allocation
_bct_buffer_allocation_size size of one change tracking buffer allocation, in bytes
_bct_chunk_size change tracking datafile chunk size, in bytes
_bct_crash_reserve_size change tracking reserved crash recovery SGA space, in bytes
_bct_file_block_size block size of change tracking file, in bytes
_bct_file_extent_size extent size of change tracking file, in bytes
_bct_fixtab_file change tracking file for fixed tables
_bct_initial_private_dba_buffer_size initial number of entries in the private change tracking dba buffers
_bct_public_dba_buffer_size total size of all public change tracking dba buffers, in bytes
_bitmap_or_improvement_enabled controls extensions to partition pruning for general predicates
_block_change_tracking change tracking possible
_blocks_per_cache_server number of consecutive blocks per global cache server
_bloom_filter_debug debug level for bloom filtering
_bloom_filter_enabled enables or disables bloom filter
_bt_mmv_query_rewrite_enabled allow rewrites with multiple MVs and base tables
_buffer_busy_wait_timeout buffer busy wait time in centiseconds
_bufq_flow_control_thrsh flow control threshold value
_bufq_max_msg_sz maximum size of the message allowed in memory
_bufq_stop_flow_control Stop enforcing flow control for buffered queues
_build_deferred_mv_skipping_mvlog_update DEFERRED MV creation skipping MV log setup update
_bump_highwater_mark_count how many blocks should we allocate per free list on advancing HWM
_bwr_for_flushed_pi if TRUE, generate a BWR for a flushed PI
_cache_stats_monitor if TRUE, enable cache stats monitoring
_cgs_reconfig_timeout CGS reconfiguration timeout interval
_cgs_send_timeout CGS send timeout value
_check_block_after_checksum perform block check after checksum if both are turned on
_check_ts_threshold check tablespace thresholds
_cleanup_rollback_entries no. of undo entries to apply per transaction cleanup
_close_cached_open_cursors close cursors cached by PL/SQL at each commit
_cluster_library cluster library selection
_collapse_wait_history collapse wait history
_collect_undo_stats Collect Statistics v$undostat
_column_compression_factor Column compression ratio
_column_elimination_off turn off predicate-only column elimination
_column_tracking_level column usage tracking
_compilation_call_heap_extent_size Size of the compilation call heaps extents
_complex_view_merging enable complex view merging
_controlfile_block_size control file block size in bytes
_controlfile_enqueue_dump dump the system states after controlfile enqueue timeout
_controlfile_enqueue_timeout control file enqueue timeout in seconds
_controlfile_section_init_size control file initial section size
_controlfile_section_max_expand control file max expansion rate
_controlfile_update_check controlfile update sanity check
_convert_set_to_join enables conversion of set operator to join
_coord_message_buffer parallel recovery coordinator side extra message buffer size
_corrupted_rollback_segments corrupted undo segment list
_cost_equality_semi_join enables costing of equality semi-join
_cpu_to_io divisor for converting CPU cost to I/O cost
_cr_grant_global_role if TRUE, grant lock for CR requests when block is in global role
_cr_grant_local_role turn 3-way CR grants off, make it automatic, or turn it on
_cr_server_log_flush if TRUE, flush redo log before serving a CR buffer
_ctas_hwm_brokered_loads Enable HWM brokered CTAS
_cursor_bind_capture_area_size maximum size of the cursor bind capture area
_cursor_bind_capture_interval interval (in seconds) between two bind capture for a cursor
_cursor_cache_frame_bind_memory frame & bind buffer caching
_cursor_db_buffers_pinned additional number of buffers a cursor can pin at once
_cursor_plan_enabled enable collection and display of cursor plans
_cursor_plan_hash_version version of cursor plan hash value
_cursor_plan_unparse_enabled enables/disables using unparse to build projection/predicates
_cursor_stats_bucket Hash table buckets for cursor stats (2^).
_cursor_stats_heap Heaps/latches for cursor stats.
_db_aging_cool_count Touch count set when buffer cooled
_db_aging_freeze_cr Make CR buffers always be too cold to keep in cache
_db_aging_hot_criteria Touch count which sends a buffer to head of replacement list
_db_aging_stay_count Touch count set when buffer moved to head of replacement list
_db_aging_touch_time Touch count which sends a buffer to head of replacement list
_db_always_check_system_ts Always perform block check and checksum for System tablespace
_db_block_adjcheck adjacent cache buffer checks - low blkchk overwrite parameter
_db_block_adjchk_level adjacent cache buffer check level
_db_block_align_direct_read Align Direct Reads
_db_block_buffers Number of database blocks cached in memory: hidden parameter
_db_block_cache_clone Always clone data blocks on get (for debugging)
_db_block_cache_history buffer header tracing (non-zero only when debugging)
_db_block_cache_history_level buffer header tracing level
_db_block_cache_num_umap number of unmapped buffers (for tracking swap calls on blocks)
_db_block_cache_protect protect database blocks (true only when debugging)
_db_block_cache_protect_internal protect database blocks (for strictly internal use only)
_db_block_check_for_debug Check more and dump block before image for debugging
_db_block_check_objtyp check objd and typ on cache disk read
_db_block_do_full_mbreads do full block read even if some blocks are in cache
_db_block_hash_buckets Number of database block hash buckets
_db_block_hash_latches Number of database block hash latches
_db_block_hi_priority_batch_size Fraction of writes for high priority reasons
_db_block_known_clean_pct Initial Percentage of buffers to maintain known clean
_db_block_lru_latches number of lru latches
_db_block_max_cr_dba Maximum Allowed Number of CR buffers per dba
_db_block_max_scan_pct Percentage of buffers to inspect when looking for free
_db_block_med_priority_batch_size Fraction of writes for medium priority reasons
_db_block_numa Number of NUMA nodes
_db_block_prefetch_limit Prefetch limit in blocks
_db_block_prefetch_quota Prefetch quota as a percent of cache size
_db_block_table_scan_buffer_size Size of shared table scan read buffer
_db_block_temp_redo generate redo for temp blocks
_db_block_trace_protect trace buffer protect calls
_db_cache_advice_batch_size cache advisory simulation batch size
_db_cache_advice_sample_factor cache advisory sampling factor
_db_cache_crx_check check for costly crx examination functions
_db_cache_pre_warm Buffer Cache Pre-Warm Enabled : hidden parameter
_db_cache_process_cr_pin_max maximum number of cr pins a process may have
_db_change_notification_enable enable db change notification
_db_fast_obj_check enable fast object drop sanity check
_db_fast_obj_ckpt enable fast object checkpoint
_db_fast_obj_truncate enable fast object truncate
_db_file_direct_io_count Sequential I/O buf size
_db_file_exec_read_count multiblock read count for regular clients
_db_file_format_io_buffers Block formatting I/O buf count
_db_file_noncontig_mblock_read_count number of noncontiguous db blocks to be prefetched
_db_file_optimizer_read_count multiblock read count for regular clients
_db_handles System-wide simultaneous buffer operations
_db_handles_cached Buffer handles cached each process
_db_hot_block_tracking track hot blocks for hash latch contention
_db_index_block_checking index block checking override parameter
_db_large_dirty_queue Number of buffers which force dirty queue to be written
_db_lost_write_checking Enable scn based lost write detection mechanism
_db_mttr_advice MTTR advisory
_db_mttr_partitions number of partitions for MTTR advisory
_db_mttr_sample_factor MTTR simulation sampling factor
_db_mttr_sim_target MTTR simulation targets
_db_mttr_sim_trace_size MTTR simulation trace size
_db_mttr_trace_to_alert dump trace entries to alert file
_db_obj_ckpt_ordered fast object checkpoint ordered by lrba
_db_obj_enable_ksr enable ksr in object checkpoint/reuse
_db_percent_hot_default Percent of default buffer pool considered hot
_db_percent_hot_keep Percent of keep buffer pool considered hot
_db_percent_hot_recycle Percent of recycle buffer pool considered hot
_db_percpu_create_cachesize size of cache created per cpu in deferred cache create
_db_recovery_temporal_file_dest default database recovery temporal file location
_db_row_overlap_checking row overlap checking override parameter for data/index blocks
_db_todefer_cache_create buffer cache deferred create
_db_writer_chunk_writes Number of writes DBWR should wait for
_db_writer_coalesce_area_size Size of memory allocated to dbwriter for coalescing writes
_db_writer_coalesce_write_limit Limit on size of coalesced write
_db_writer_flush_imu If FALSE, DBWR will not downgrade IMU txns for AGING
_db_writer_histogram_statistics maintain dbwr histogram statistics in x$kcbbhs
_db_writer_max_writes Max number of outstanding DB Writer IOs
_db_writer_verify_writes Enable lost write detection mechanism
_dbg_proc_startup debug process startup
_dbwr_async_io Enable dbwriter asynchronous writes
_dbwr_scan_interval dbwriter scan interval
_dbwr_tracing Enable dbwriter tracing
_dead_process_scan_interval PMON dead process scan interval
_dedicated_server_poll_count dedicated server poll count
_dedicated_server_post_wait dedicated server post/wait
_dedicated_server_post_wait_call dedicated server post/wait call
_default_encrypt_alg default encryption algorithm
_default_non_equality_sel_check sanity check on default selectivity for like/range predicate
_delay_index_maintain delays index maintenance until after MV is refreshed
_diag_daemon start DIAG daemon
_diag_diagnostics Turn off diag diagnostics
_dimension_skip_null control dimension skip when null feature
_disable_adaptive_shrunk_aggregation adaptive shrunk aggregation
_disable_datalayer_sampling disable datalayer sampling
_disable_duplex_link Turn off connection duplexing
_disable_fast_aggregation fast aggregation
_disable_file_locks disable file locks for control, data, redo log files
_disable_function_based_index disable function-based index matching
_disable_health_check Disable Health Check
_disable_image_check Disable Oracle executable image checking
_disable_incremental_checkpoints Disable incremental checkpoints for thread recovery
_disable_incremental_recovery_ckpt Disable incremental recovery checkpoint mechanism
_disable_instance_params_check disable instance type check for ksp
_disable_interface_checking disable interface checking at startup
_disable_kcbhxor_osd disable kcbh(c)xor OSD functionality
_disable_latch_free_SCN_writes_via_32cas disable latch-free SCN writes using 32-bit compare & swap
_disable_latch_free_SCN_writes_via_64cas disable latch-free SCN writes using 64-bit compare & swap
_disable_logging Disable logging
_disable_multiple_block_sizes disable multiple block size support (for debugging)
_disable_odm disable odm feature
_disable_recoverable_recovery Disable the new recoverable recovery mechanism
_disable_recovery_read_skip Disable the read optimization during media recovery
_disable_sample_io_optim disable row sampling IO optimization
_disable_savepoint_reset disable the fix for bug 1402161
_disable_selftune_checkpointing Disable self-tune checkpointing
_disable_streams_pool_auto_tuning disable streams pool auto tuning
_disable_sun_rsm Disable IPC OSD support for Sun RSMAPI
_disable_system_state disable system state dump
_disable_txn_alert disable txn layer alert
_discrete_transactions_enabled enable OLTP mode
_dispatcher_rate_scale scale to display rate statistic (100ths of a second)
_dispatcher_rate_ttl time-to-live for rate statistic (100ths of a second)
_distinct_view_unnesting enables unnesting of in subquery into distinct view
_distributed_recovery_connection_hold_time number of seconds RECO holds outbound connections open
_dlm_send_timeout DLM send timeout value
_dlmtrace Trace string of global enqueue type(s)
_dm_max_shared_pool_pct max percentage of the shared pool to use for a mining model
_dml_monitoring_enabled enable modification monitoring
_domain_index_batch_size maximum number of rows from one call to domain index fetch routine
_domain_index_dml_batch_size maximum number of rows for one call to domain index dml routines
_drop_table_granule drop_table_granule
_drop_table_optimization_enabled reduce SGA memory use during drop of a partitioned table
_ds_iocount_iosize Dynamic Sampling Service defaults: #IOs and IO Size
_dss_cache_flush enable full cache flush for parallel execution
_dtree_area_size size of Decision Tree Classification work area
_dtree_binning_enabled Decision Tree Binning Enabled
_dtree_bintest_id Decision Tree Binning Test ID
_dtree_compressbmp_enabled Decision Tree Using Compressed Bitmaps Enabled
_dtree_max_surrogates maximum number of surrogates
_dtree_pruning_enabled Decision Tree Pruning Enabled
_dummy_instance dummy instance started by RMAN
_dump_common_subexpressions dump common subexpressions
_dump_connect_by_loop_data dump connect by loop error message into trc file
_dump_cursor_heap_sizes dump comp/exec heap sizes to tryace file
_dump_interval_limit trace dump time interval limit (in seconds)
_dump_max_limit max number of dump within dump interval
_dump_qbc_tree dump top level query parse tree to trace
_dump_rcvr_ipc if TRUE enables IPC dump at instance eviction time
_dump_system_state_scope scope of sysstate dump during instance termination
_dump_trace_scope scope of trace dump during a process crash
_dynamic_rls_policies rls policies are dynamic
_dynamic_stats_threshold delay threshold (in seconds) between sending statistics messages
_eliminate_common_subexpr enables elimination of common sub-expressions
_enable_NUMA_optimization Enable NUMA specific optimizations
_enable_block_level_transaction_recovery enable block level recovery
_enable_cscn_caching enable commit SCN caching for all transactions
_enable_default_affinity to enable default implementation of affinity osds
_enable_dml_lock_escalation enable dml lock escalation against partitioned tables if TRUE
_enable_exchange_validation_using_check use check constraints on the table for validation
_enable_fast_ref_after_mv_tbs enable fast refresh after move tablespace
_enable_hash_overflow TRUE - enable hash cluster overflow based on SIZE
_enable_hwm_sync enable HWM synchronization
_enable_kgh_policy temporary to disable/enable kgh policy
_enable_list_io Enable List I/O
_enable_nativenet_tcpip Enable skgxp driver usage for native net
_enable_refresh_schedule enable or disable MV refresh scheduling (revert to 9.2 behavior)
_enable_reliable_latch_waits Enable reliable latch waits
_enable_rlb enable RLB metrics processing
_enable_tablespace_alerts enable tablespace alerts
_enable_type_dep_selectivity enable type dependent selectivity estimates
_enqueue_debug_multi_instance debug enqueue multi instance
_enqueue_hash enqueue hash table length
_enqueue_hash_chain_latches enqueue hash chain latches
_enqueue_locks locks for managed enqueues
_enqueue_resources resources for enqueues
_expand_aggregates expand aggregates
_explain_rewrite_mode allow additional messages to be generated during explain rewrite
_extended_pruning_enabled do runtime pruning in iterator if set to TRUE
_fair_remote_cvt if TRUE enables fair remote convert
_fairness_threshold number of times to CR serve before downgrading lock
_fast_dual_enabled enable/disable fast dual
_fast_full_scan_enabled enable/disable index fast full scan
_fast_start_instance_recovery_target cluster availability target time in RAC environment
_fic_algorithm_set Set Frequent Itemset Counting Algorithm
_fic_area_size size of Frequent Itemset Counting work area
_fic_max_length Frequent Itemset Counting Maximum Itemset Length
_fic_min_bmsize Frequent Itemset Counting Minimum BITMAP Size
_fic_outofmem_candidates Frequent Itemset Counting Out Of Memory Candidates Generation
_fifth_spare_parameter fifth spare parameter - string
_filemap_dir FILEMAP directory
_first_spare_parameter first spare parameter - integer
_flashback_allow_noarchivelog Allow enabling flashback on noarchivelog database
_flashback_barrier_interval Flashback barrier interval in seconds
_flashback_copy_latches Number of flashback copy latches
_flashback_fuzzy_barrier Use flashback fuzzy barrier
_flashback_generation_buffer_size flashback generation buffer size
_flashback_hint_barrier_percent Flashback hint barrier percent
_flashback_log_io_error_behavior Specify Flashback log I/O error behavior
_flashback_log_min_size Minimum flashback log size
_flashback_log_size Flashback log size
_flashback_logfile_enqueue_timeout flashback logfile enqueue timeout for opens
_flashback_max_log_size Maximum flashback log size in bytes (OS limit)
_flashback_max_n_log_per_thread Maximum number of flashback logs per flashback thread
_flashback_n_log_per_thread Desired number of flashback logs per flashback thread
_flashback_standby_barrier_interval Flashback standby barrier interval in seconds
_flashback_verbose_info Print verbose information about flashback database
_flashback_write_size_qm Desired flashback write size in quarter MB
_force_datefold_trunc force use of trunc for datefolding rewrite
_force_rewrite_enable control new query rewrite features
_force_temptables_for_gsets executes concatenation of rollups using temp tables
_fourth_spare_parameter fourth spare parameter - string
_full_pwise_join_enabled enable full partition-wise join when TRUE
_gby_hash_aggregation_enabled enable group-by and aggregation using hash scheme
_gby_onekey_enabled enable use of one comparison of all group by keys
_gc_affinity_limit dynamic affinity limit
_gc_affinity_minimum dynamic affinity minimum activity per minute
_gc_affinity_time if non zero, enable dynamic object affinity
_gc_check_bscn if TRUE, check for stale blocks
_gc_coalesce_recovery_reads if TRUE, coalesce recovery reads
_gc_defer_time how long to defer down converts for hot buffers
_gc_dynamic_affinity_locks if TRUE, get dynamic affinity locks
_gc_element_percent global cache element percent
_gc_global_lru turn global lru off, make it automatic, or turn it on
_gc_integrity_checks set the integrity check level
_gc_keep_recovery_buffers if TRUE, make recovery buffers current
_gc_latches number of latches per LMS process
_gc_maximum_bids maximum number of bids which can be prepared
_gc_statistics if TRUE, kcl statistics are maintained
_gc_undo_affinity if TRUE, enable dynamic undo affinity
_gc_undo_affinity_locks if TRUE, get affinity locks for undo
_gc_use_cr if TRUE, allow CR pins on PI and WRITING buffers
_gc_vector_read if TRUE, vector read current buffers
_gcs_fast_reconfig if TRUE, enable fast reconfiguration for gcs locks
_gcs_latches number of gcs resource hash latches to be allocated per LMS process
_gcs_process_in_recovery if TRUE, process gcs requests during instance recovery
_gcs_resources number of gcs resources to be allocated
_gcs_shadow_locks number of pcm shadow locks to be allocated
_generalized_pruning_enabled controls extensions to partition pruning for general predicates
_ges_dd_debug if TRUE enables GES deadlock detection debug diagnostics
_ges_diagnostics if TRUE enables GES diagnostics
_ges_health_check if greater than 0 enables GES system health check
_groupby_nopushdown_cut_ratio groupby nopushdown cut ratio
_groupby_orderby_combine groupby/orderby don't combine threshold
_gs_anti_semi_join_allowed enable anti/semi join for the GS query
_hang_analysis_num_call_stacks hang analysis num call stacks
_hang_detection Hang Management detection interval
_hard_protection if TRUE enable H.A.R.D specific format changes
_hash_join_enabled enable/disable hash join
_hash_multiblock_io_count number of blocks hash join will read/write at once
_high_server_threshold high server thresholds
_hj_bit_filter_threshold hash-join bit filtering threshold (0 always enabled)
_hwm_sync_threshold HWM synchronization threshold in percentage
_idl_conventional_index_maintenance enable conventional index maintenance for insert direct load
_idxrb_rowincr proportionality constant for dop vs. rows in index rebuild
_ignore_desc_in_index ignore DESC in indexes, sort those columns ascending anyhow
_immediate_commit_propagation if TRUE, propagate commit SCN immediately
_improved_outerjoin_card improved outer-join cardinality calculation
_improved_row_length_enabled enable the improvements for computing the average row length
_imr_active Activate Instance Membership Recovery feature
_imr_disk_voting_interval Maximum wait for IMR disk voting (seconds)
_imr_max_reconfig_delay Maximum Reconfiguration delay (seconds)
_imr_splitbrain_res_wait Maximum wait for split-brain resolution (seconds)
_imu_pools in memory undo pools
_in_memory_undo Make in memory undo for top level transactions
_incremental_recovery_ckpt_min_batch Minimum number of writes for incremental recovery ckpt every 3 sec
_index_join_enabled enable the use of index joins
_index_prefetch_factor index prefetching factor
_init_granule_interval number of granules to process for deferred cache
_init_sql_file File containing SQL statements to execute upon database creation
_inject_startup_fault inject fault in the startup code
_insert_enable_hwm_brokered during parallel inserts high water marks are brokered
_inst_locking_period period an instance can retain a newly acquired level1 bitmap
_interconnect_checksum if TRUE, checksum interconnect blocks
_intrapart_pdml_enabled Enable intra-partition updates/deletes
_intrapart_pdml_randomlocal_enabled Enable intra-partition updates/deletes with random local dist
_io_shared_pool_size Size of I/O buffer pool from SGA
_io_slaves_disabled Do not use I/O slaves
_ior_serialize_fault inject fault in the ior serialize code
_ioslave_batch_count Per attempt IOs picked
_ioslave_issue_count IOs issued before completion check
_ipc_fail_network Simulate cluster network failer
_ipc_test_failover Test transparent cluster network failover
_ipc_test_mult_nets simulate multiple cluster networks
_job_queue_interval Wakeup interval in seconds for job queue co-ordinator
_kcl_commit if TRUE, call kjbcommit
_kcl_conservative_log_flush if TRUE, conservatively log flush before CR serving
_kcl_debug if TRUE, record le history
_kcl_index_split if TRUE, reject pings on blocks in middle of a split
_kcl_undo_grouping grouping for undo block locks
_kcl_undo_locks number of locks per undo segment
_kdbl_enable_post_allocation allocate dbas after populating data buffers
_keep_remote_column_size remote column size does not get modified
_kernel_message_network_driver kernel message network driver
_kffmap_hash_size size of kffmap_hash table
_kffmop_hash_size size of kffmop_hash table
_kghdsidx_count max kghdsidx count
_kgl_bucket_count index to the bucket count array
_kgl_fixed_extents fixed extent size for library cache memory allocations
_kgl_hash_collision whether KGL hash collision is possible
_kgl_heap_size extent size for library cache heap 0
_kgl_keep_cache_pct KGL keep cache minimum threshold
_kgl_keep_cache_retain_pct KGL keep cache retain threshold
_kgl_large_heap_warning_threshold maximum heap size before KGL writes warnings to the alert log
_kgl_latch_count number of library cache latches
_kgl_multi_instance_invalidation whether KGL to support multi-instance invalidations
_kgl_multi_instance_lock whether KGL to support multi-instance locks
_kgl_multi_instance_pin whether KGL to support multi-instance pins
_kgl_session_cached_objects maximum length of the KGL object cache lru
_kgl_time_to_wait_for_locks time to wait for locks and pins before timing out
_kglsim_maxmem_percent max percentage of shared pool size to be used for KGL advice
_kgx_latches # of mutex latches if CAS is not supported.
_kill_java_threads_on_eoc Kill Java threads and do sessionspace migration at end of call
_kkfi_trace trace expression substitution
_kks_use_mutex_pin Turning on this will make KKS use mutex for cursor pins.
_kolfuseslf allow kolf to use slffopen
_kql_subheap_trace tracing level for library cache subheap level pins
_ksd_test_param KSD test parmeter
_ksdxdocmd_default_timeout_ms default timeout for internal oradebug commands
_ksdxw_cini_flg ksdxw context initialization flag
_ksdxw_nbufs ksdxw number of buffers in buffered mode
_ksdxw_num_pgw number of watchpoints on a per-process basis
_ksdxw_num_sgw number of watchpoints to be shared by all processes
_ksdxw_stack_depth number of PCs to collect in the stack when watchpoint is hit
_kse_die_timeout amount of time a dying process is spared by PMON (in centi-secs)
_kse_pc_table_size kse pc table cache size
_ksfd_verify_write verify asynchronous writes issued through ksfd
_ksi_trace KSI trace string of lock type(s)
_ksmg_granule_locking_status granule locking status
_ksmg_granule_size granule size in bytes
_ksmg_lock_check_interval timeout action interval in minutes
_ksmg_lock_reacquire_count repeat count for acquisition of locks
_ksu_diag_kill_time number of seconds ksuitm waits before killing diag
_ksuitm_dont_kill_dumper delay inst. termination to allow processes to dump
_ksxp_diagmode set to OFF to disable automatic slowsend diagnostics
_ksxp_reporting_process reporting process for KSXP
_ksxp_send_timeout set timeout for sends queued with the inter-instance IPC
_ktc_debug for ktc debug
_ktc_latches number of ktc latches
_ktu_latches number of KTU latches
_ku_trace datapump trace parameter
_large_pool_min_alloc minimum allocation size in bytes for the large allocation pool
_last_allocation_period period over which an instance can retain an active level1 bitmap
_latch_class_0 latch class 0
_latch_class_1 latch class 1
_latch_class_2 latch class 2
_latch_class_3 latch class 3
_latch_class_4 latch class 4
_latch_class_5 latch class 5
_latch_class_6 latch class 6
_latch_class_7 latch class 7
_latch_classes latch classes override
_latch_miss_stat_sid Sid of process for which to collect latch stats
_latch_recovery_alignment align latch recovery structures
_ldr_io_size size of write IOs used during a load operation
_left_nested_loops_random enable random distribution method for left of nestedloops
_lgwr_async_broadcasts LGWR Asynchronous Broadcasts enabling boolean flag
_lgwr_async_io LGWR Asynchronous IO enabling boolean flag
_lgwr_delay_write LGWR write delay for debugging
_lgwr_io_slaves LGWR I/O slaves
_lgwr_max_ns_wt Maximum wait time for lgwr to allow NetServer to progress
_lgwr_ns_nl_max Variable to simulate network latency or buffer threshold
_lgwr_ns_nl_min Variable to simulate network latency or buffer threshold
_lgwr_ns_sim_err Variable to simulate errors lgwrns
_lgwr_ta_sim_err Variable to simulate errors lgwr true async
_library_cache_advice whether KGL advice should be turned on
_lightweight_hdrs Lightweight headers for redo
_like_with_bind_as_equality treat LIKE predicate with bind as an equality predicate
_lm_activate_lms_threshold threshold value to activate an additional lms
_lm_cache_lvl0_cleanup how often to cleanup level 0 cache res (in sec)
_lm_cache_res_cleanup percentage of cached resources should be cleanup
_lm_cache_res_type cache resource: string of lock types(s)
_lm_checksum_batch_msg GES checksum batch messages
_lm_contiguous_res_count number of contiguous blocks that will hash to the same HV bucket
_lm_dd_interval dd time interval in seconds
_lm_dd_scan_interval dd scan interval in seconds
_lm_drm_max_requests dynamic remastering maximum affinity requests processed together
_lm_drm_window dynamic remastering bucket window size
_lm_drm_xlatch dynamic remastering forced exclusive latches
_lm_dynamic_lms dynamic lms invocation
_lm_dynamic_load dynamic load adjustment
_lm_dynamic_remastering if TRUE enables dynamic remastering
_lm_enq_lock_freelist Number of ges enqueue element freelist
_lm_enq_rcfg if TRUE enables enqueue reconfiguration
_lm_enqueue_freelist Number of enqueue freelist
_lm_file_affinity mapping between file id and master instance number
_lm_global_posts if TRUE deliver global posts to remote nodes
_lm_lmd_waittime default wait time for lmd in centiseconds
_lm_lms number of background gcs server processes to start
_lm_lms_waittime default wait time for lms in centiseconds
_lm_locks number of enqueues configured for cluster database
_lm_master_weight master resource weight for this instance
_lm_max_lms max. number of background global cache server processes
_lm_min_lms min. number of background global cache server processes
_lm_msg_batch_size GES batch message size
_lm_msg_cache_thresholds GES message buffer caching threshold
_lm_msg_cleanup_interval GES message buffer cleanup interval time
_lm_node_join_opt cluster database node join optimization in reconfig
_lm_non_fault_tolerant disable cluster database fault-tolerance mode
_lm_num_pcmhv_latches number of latches covering the PCM HV buckets in cgs
_lm_num_pt_buckets number of buckets in the object affinity hash table
_lm_num_pt_latches number of latches in the object affinity hash table
_lm_proc_freeze_timeout reconfiguration: process freeze timeout
_lm_process_batching GES implicit process batching for IPC messages
_lm_procs number of client processes configured for cluster database
_lm_rcfg_timeout Reconfiguration timeout
_lm_rcv_buffer_size the size of receive buffer
_lm_res_hash_bucket number of resource hash buckets
_lm_res_part number of resource partition configured for gcs
_lm_ress number of resources configured for cluster database
_lm_send_buffers number of cluster database send buffers
_lm_send_mode GES send mode
_lm_send_queue_batching GES send queue message batching
_lm_send_queue_length GES send queue maximum length
_lm_sendproxy_reserve GES percentage of send proxy reserve of send tickets
_lm_share_lock_opt if TRUE enables share lock optimization
_lm_sq_batch_factor GES send queue minimum batching factor
_lm_sq_batch_type GES send queue batching mechanism
_lm_sq_batch_waittick GES send queue batching waittime in tick
_lm_sync_timeout Synchronization timeout for DLM reconfiguration steps
_lm_ticket_active_sendback Flow control ticket active sendback threshold
_lm_tickets GES messaging tickets
_lm_tx_delta TX lock localization delta
_lm_validate_resource_type if TRUE enables resource name validation
_lm_xids number of transaction IDs configured for cluster database
_load_without_compile Load PL/SQL or Database objects without compilation
_local_communication_costing_enabled enable local communication costing when TRUE
_local_communication_ratio set the ratio between global and local communication (0..100)
_lock_sga_areas Lock specified areas of the SGA in physical memory
_log_archive_avoid_memcpy log archive avoid memcpy
_log_archive_buffer_size Size of each archival buffer in log file blocks
_log_archive_buffers Number of buffers to allocate for archiving
_log_archive_callout archival callout
_log_archive_compress_enable Bypass database rules for enabling archivelog compression
_log_archive_delta_sync_wait iterative sleep time in centiseconds seconds when SYNC=PARALLEL
_log_archive_net_timeout maximum network wait time in seconds when SYNC=PARALLEL
_log_archive_network_redo_size Log archive network redo buffer size used by ARCH
_log_archive_prot_auto_demote log archive protection auto demotion
_log_archive_security_enabled log archive security enabled
_log_blocks_during_backup log block images when changed during backup
_log_buffers_corrupt corrupt redo buffers before write
_log_buffers_debug debug redo buffers (slows things down)
_log_checkpoint_recovery_check # redo blocks to verify after checkpoint
_log_committime_block_cleanout Log commit-time block cleanout
_log_debug_multi_instance debug redo multi instance code
_log_deletion_policy archivelog deletion policy for mandatory/all destination
_log_io_size automatically initiate log write if this many redo blocks in buffer
_log_parallelism Number of log buffer strands
_log_parallelism_dynamic Enable dynamic strands
_log_parallelism_max Maximum number of log buffer strands
_log_private_mul Private strand multiplier for log space preallocation
_log_private_parallelism Number of private log buffer strands for zero-copy redo
_log_private_parallelism_mul Active sessions multiplier to deduce number of private strands
_log_simultaneous_copies number of simultaneous copies into redo buffer(# of copy latches)
_log_space_errors should we report space errors to alert log
_log_switch_timeout Maximum number of seconds redos in the current log could span
_longops_enabled longops stats enabled
_low_server_threshold low server thresholds
_master_direct_sends direct sends for messages from master (DFS)
_mav_refresh_consistent_read refresh materialized views using consistent read snapshot
_mav_refresh_double_count_prevented materialized view MAV refreshes avoid double counting
_mav_refresh_opt optimizations during refresh of materialized views
_mav_refresh_unionall_tables # tables for union all expansion during materialized view refresh
_max_arch_lns_wait Maximum wait by ARCH to allow NetServer to complete archival
_max_exponential_sleep max sleep during exponential backoff
_max_lns_shutdown_archival_time Maximum time spent by LNS to archive last log during shutdown
_max_protocol_support Max occurrence protocols supported in a process
_max_rfs_connections maximum number of connections used for remote archival
_max_shrink_obj_stats number of segments for which shrink stats will be maintained
_max_sleep_holding_latch max time to sleep while holding a latch
_media_recovery_read_batch media recovery block read batch
_media_recovery_reap_time media recovery reap time
_mem_annotation_pr_lev private memory annotation collection level
_mem_annotation_scale memory annotation pre-allocation scaling
_mem_annotation_sh_lev shared memory annotation collection level
_mem_annotation_store memory annotation in-memory store
_mem_std_extent_size standard extent size for fixed-size-extent heaps
_memory_broker_log_stat_entries memory broker num stat entries
_memory_broker_shrink_heaps memory broker allow policy to shrink shared pool
_memory_broker_shrink_java_heaps memory broker allow policy to shrink java pool
_memory_broker_shrink_streams_pool memory broker allow policy to shrink streams pool
_memory_broker_shrink_timeout memory broker policy to timeout shrink shared/java pool
_memory_broker_stat_interval memory broker statistics gathering interval
_memory_management_tracing trace memory management activity
_memory_sanity_check partial granule sanity check
_messages message queue resources - dependent on # processes & # buffers
_minimal_stats_aggregation prohibit stats aggregation at compile/partition maintenance time
_minimum_blocks_to_shrink minimum number freeable blocks for shrink to be present
_minimum_extents_to_shrink minimum number freeable extents for shrink to be present
_minimum_giga_scn Minimum SCN to start with in 2^30 units
_mirror_redo_buffers Save buffers for debugging redo corruptions
_mmv_query_rewrite_enabled allow rewrites with multiple MVs and/or base tables
_multi_join_key_table_lookup TRUE iff multi-join-key table lookup prefetch is enabled
_multiple_instance_recovery use multiple instances for media recovery
_mv_refresh_ana what percent to analyze after complete/PCT refresh
_mv_refresh_costing refresh decision based on cost or on rules
_mv_refresh_delta_fraction delta mv as fractional percentage of size of mv
_mv_refresh_eut refresh materialized views using EUT(partition)-based algorithm
_mv_refresh_force_parallel_query force materialized view refreshes to use parallel query
_mv_refresh_new_setup_disabled materialized view MV refresh new setup disabling
_mv_refresh_rebuild_percentage minimum percentage change required in MV to force an index rebuild
_mv_refresh_selections create materialized views with selections and fast refresh
_mv_refresh_use_stats pass cardinality hints to refresh queries
_mv_refsched_timeincr proportionality constant for dop vs. time in MV refresh
_mv_rolling_inv create/alter mv uses rolling cursor invalidation instead of immediate
_mwin_schedule Enable/disable Maintenance Window Schedules
_nchar_imp_cnv NLS allow Implicit Conversion between CHAR and NCHAR
_nchar_imp_conv should implicit conversion bewteen clob and nclob be allowed
_ncmb_readahead_enabled enable multi-block readahead for an index scan
_ncmb_readahead_tracing turn on multi-block readahead tracing
_nested_loop_fudge nested loop fudge
_nested_mav_fast_oncommit_enabled nested MAV refresh fast on commit allowed
_new_initial_join_orders enable initial join orders based on new ordering heuristics
_new_sort_cost_estimate enables the use of new cost estimate for sort
_newsort_enabled controls whether new sorts can be used as system sort
_newsort_ordered_pct controls when new sort avoids sorting ordered input
_newsort_type specifies options for the new sort algorithm
_no_objects no object features are used
_no_or_expansion OR expansion during optimization disabled
_no_recovery_through_resetlogs no recovery through this resetlogs operation
_notify_crs notify cluster ready services of startup and shutdown
_ns_max_flush_wt Flush wait time for NetServer to flush oustanding writes
_ns_max_send_delay Data Loss Time Bound for NetServer
_num_longop_child_latches number of child latches for long op array
_number_cached_attributes maximum number of cached attributes per instance
_object_statistics enable the object level statistics collection
_offline_rollback_segments offline undo segment list
_ogms_home GMS home directory
_olap_aggregate_buffer_size OLAP Aggregate max buffer size
_olap_aggregate_flags OLAP Aggregate debug flags
_olap_aggregate_function_cache_enabled OLAP Aggregate function cache enabler
_olap_aggregate_function_merge_threshold OLAP Aggregate function merge threshold
_olap_aggregate_max_thread_tuples OLAP Aggregate max thread tuples creation
_olap_aggregate_min_buffer_size OLAP Aggregate min buffer size
_olap_aggregate_min_thread_status OLAP Aggregate minimum cardinality of dimensions for thread
_olap_aggregate_multipath_hier OLAP Aggregate Multi-path Hierarhies enabled
_olap_aggregate_statlen_thresh OLAP Aggregate status array usage threshold
_olap_aggregate_store_probability OLAP Aggregate function storeback probability
_olap_aggregate_work_per_thread OLAP Aggregate max work parents
_olap_aggregate_worklist_max OLAP Aggregate max worklists generated at once
_olap_allocate_errorlog_format OLAP Allocate Errorlog Format
_olap_allocate_errorlog_header OLAP Allocate Errorlog Header format
_olap_continuous_trace_file Specify TRUE to enable continuous OLAP tracing - otherwise only exceptional events will be logged
_olap_dbgoutfile_echo_to_eventlog OLAP DbgOutfile copy output to event log (tracefile)
_olap_dimension_corehash_class OLAP Dimension In-Core Hash Table Class
_olap_dimension_corehash_max OLAP Dimension In-Core Hash Table Maximum Size
_olap_eif_export_lob_size OLAP EIF Export BLOB size
_olap_lmgen_dim_size Limitmap generator dimension column size
_olap_lmgen_meas_size Limitmap generator measure column size
_olap_object_hash_class OLAP Object Hash Table Class
_olap_page_pool_expand_rate OLAP Page Pool Expand Rate
_olap_page_pool_hi OLAP Page Pool High Watermark
_olap_page_pool_hit_target OLAP Page Pool Hit Target
_olap_page_pool_low OLAP Page Pool Low Watermark
_olap_page_pool_pressure OLAP Page Pool Pressure Threshold
_olap_page_pool_shrink_rate OLAP Page Pool Shrink Rate
_olap_parallel_update_small_group OLAP parallel update pagespace by group
_olap_parallel_update_small_threshold OLAP parallel update threshold for number of small pagespaces
_olap_parallel_update_threshold OLAP parallel update threshold in pages
_olap_poutlog_echo_to_eventlog OLAP POutLog copy output to event log (tracefile)
_olap_sesscache_enabled OLAP Session Cache knob
_olap_sort_buffer_size OLAP Sort Buffer Size
_olap_statbool_corebits OLAP Status Boolean max incore bits
_olap_statbool_threshold OLAP Status Boolean CBM threshold
_olap_table_function_statistics Specify TRUE to output OLAP table function timed statistics trace
_olap_wrap_errors Wrap error messages to OLAP outfile
_olapi_history_retention enable olapi history retention
_olapi_iface_object_history enable olapi interface object history collection
_olapi_iface_object_history_retention enable olapi interface object history retention
_olapi_iface_operation_history_retention enable olapi interface operation history retention
_olapi_interface_operation_history enable olapi interface operation history collection
_olapi_memory_operation_history enable olapi memory alloc/free history collection
_olapi_memory_operation_history_pause_at_seqno enable olapi memory alloc/free history collection pausing
_olapi_memory_operation_history_retention enable olapi memory operation history retention
_olapi_session_history enable olapi session history collection
_olapi_session_history_retention enable olapi session history retention
_old_connect_by_enabled enable/disable old connect by
_ols_cleanup_task Clean up unnecessary entries in OLS sessinfo table
_omf enable/disable OMF
_oneside_colstat_for_equijoins sanity check on default selectivity for like/range predicate
_optim_adjust_for_part_skews adjust stats for skews across partitions
_optim_dict_stats_at_db_cr_upg enable/disable dictionary stats gathering at db create/upgrade
_optim_enhance_nnull_detection TRUE to enable index [fast] full scan more often
_optim_new_default_join_sel improves the way default equijoin selectivity are computed
_optim_peek_user_binds enable peeking of user binds
_optimizer_adjust_for_nulls adjust selectivity for null values
_optimizer_autostats_job enable/disable auto stats collection job
_optimizer_better_inlist_costing enable improved costing of index access using in-list(s)
_optimizer_block_size standard block size used by optimizer
_optimizer_cache_stats cost with cache statistics
_optimizer_cartesian_enabled optimizer cartesian join enabled
_optimizer_cbqt_factor cost factor for cost-based query transformation
_optimizer_cbqt_no_size_restriction disable cost based transformation query size restriction
_optimizer_ceil_cost CEIL cost in CBO
_optimizer_choose_permutation force the optimizer to use the specified permutation
_optimizer_complex_pred_selectivity enable selectivity estimation for builtin functions
_optimizer_compute_index_stats force index stats collection on index creation/rebuild
_optimizer_correct_sq_selectivity force correct computation of subquery selectivity
_optimizer_cost_based_transformation enables cost-based query transformation
_optimizer_cost_filter_pred enables costing of filter predicates in IO cost model
_optimizer_cost_hjsmj_multimatch add cost of generating result set when #rows per key > 1
_optimizer_cost_model optimizer cost model
_optimizer_degree force the optimizer to use the same degree of parallelism
_optimizer_dim_subq_join_sel use join selectivity in choosing star transformation dimensions
_optimizer_disable_strans_sanity_checks disable star transformation sanity checks
_optimizer_dyn_smp_blks number of blocks for optimizer dynamic sampling
_optimizer_enhanced_filter_push push filters before trying cost-based query transformation
_optimizer_extended_cursor_sharing optimizer extended cursor sharing
_optimizer_filter_pred_pullup use cost-based flter predicate pull up transformation
_optimizer_ignore_hints enables the embedded hints to be ignored
_optimizer_invalidation_period time window for invalidation of cursors of analyzed objects
_optimizer_join_elimination_enabled optimizer join elimination enabled
_optimizer_join_order_control controls the optimizer join order search algorithm
_optimizer_join_sel_sanity_check enable/disable sanity check for multi-column join selectivity
_optimizer_max_permutations optimizer maximum join permutations per query block
_optimizer_min_cache_blocks set minimum cached blocks
_optimizer_mjc_enabled enable merge join cartesian
_optimizer_mode_force force setting of optimizer mode for user recursive SQL also
_optimizer_multiple_cenv generate and run plans using several compilation environments
_optimizer_new_join_card_computation compute join cardinality using non-rounded input values
_optimizer_or_expansion control or expansion approach used
_optimizer_order_by_elimination_enabled Eliminates order bys from views before query transformation
_optimizer_outer_to_anti_enabled Enable transformation of outer-join to anti-join if possible
_optimizer_percent_parallel optimizer percent parallel
_optimizer_push_down_distinct push down distinct from query block to table
_optimizer_push_pred_cost_based use cost-based query transformation for push pred optimization
_optimizer_random_plan optimizer seed value for random plans
_optimizer_rownum_pred_based_fkr enable the use of first K rows due to rownum predicate
_optimizer_save_stats enable/disable saving old versions of optimizer stats
_optimizer_search_limit optimizer search limit
_optimizer_self_induced_cache_cost account for self-induced caching
_optimizer_skip_scan_enabled enable/disable index skip scan
_optimizer_sortmerge_join_enabled enable/disable sort-merge join method
_optimizer_squ_bottomup enables unnesting of subquery in a bottom-up manner
_optimizer_star_tran_in_with_clause enable/disable star transformation in with clause queries
_optimizer_starplan_enabled optimizer star plan enabled
_optimizer_system_stats_usage system statistics usage
_optimizer_trace optimizer trace parameter
_optimizer_transitivity_retain retain equi-join pred upon transitive equality pred generation
_optimizer_undo_changes undo changes to query optimizer
_optimizer_undo_cost_change optimizer undo cost change
_or_expand_nvl_predicate enable OR expanded plan for NVL/DECODE predicate
_oradbg_pathname path of oradbg script
_oradebug_force force target processes to execute oradebug commands?
_ordered_nested_loop enable ordered nested loop costing
_ordered_semijoin enable ordered semi-join subquery
_os_sched_high_priority OS high priority level
_other_wait_event_exclusion exclude event names from _other_wait_threshold calculations
_other_wait_threshold threshold wait percentage for event wait class Other
_outline_bitmap_tree BITMAP_TREE hint enabled in outline
_parallel_adaptive_max_users maximum number of users running with default DOP
_parallel_broadcast_enabled enable broadcasting of small inputs to hash and sort merge joins
_parallel_default_max_instances default maximum number of instances for parallel query
_parallel_execution_message_align Alignment of PX buffers to OS page boundary
_parallel_fake_class_pct fake db-scheduler percent used for testing
_parallel_fixwrite_bucket Number of buckets for each round of fix write
_parallel_load_bal_unit number of threads to allocate per instance
_parallel_load_balancing parallel execution load balanced slave allocation
_parallel_min_message_pool minimum size of shared pool memory to reserve for pq servers
_parallel_recovery_stopat stop at -position- to step through SMON
_parallel_replay_msg_limit Number of messages for each round of parallel replay
_parallel_server_idle_time idle time before parallel query server dies (in 1/100 sec)
_parallel_server_sleep_time sleep time between dequeue timeouts (in 1/100ths)
_parallel_slave_acquisition_wait time(in seconds) to wait before retrying slave acquisition
_parallel_txn_global enable parallel_txn hint with updates and deletes
_parallelism_cost_fudge_factor set the parallelism cost fudge factor
_parameter_table_block_size parameter table block size
_partial_pwise_join_enabled enable partial partition-wise join when TRUE
_partition_view_enabled enable/disable partitioned views
_passwordfile_enqueue_timeout password file enqueue timeout in seconds
_pct_refresh_double_count_prevented materialized view PCT refreshes avoid double counting
_pdml_gim_sampling control separation of global index maintenance for PDML
_pdml_gim_staggered slaves start on different index when doing index maint
_pdml_slaves_diff_part slaves start on different partition when doing index maint
_percent_flashback_buf_partial_full Percent of flashback buffer filled to be considered partial full
_pga_large_extent_size PGA large extent size
_pga_max_size Maximum size of the PGA memory for one process
_ping_level fusion ping level
_pkt_enable enable progressive kill test
_pkt_pmon_interval PMON process clean-up interval (cs)
_pkt_start start progressive kill test instrumention
_plan_outline_data explain plan outline data enabled
_plsql_anon_block_code_type PL/SQL anonymous block code-type
_plsql_cache_enable PL/SQL Function Cache Enabled
_plsql_dump_buffer_events conditions upon which the PL/SQL circular buffer is dumped
_plsql_minimum_cache_hit_percent plsql minimum cache hit percentage required to keep caching active
_plsql_nvl_optimize PL/SQL NVL optimize
_pmon_load_constants server load balancing constants (S,P,D,I,L,C,M)
_pre_rewrite_push_pred push predicates into views before rewrite
_precompute_gid_values precompute gid values and copy them before returning a row
_pred_move_around enables predicate move-around
_predicate_elimination_enabled allow predicate elimination if set to TRUE
_prescomm presume commit of IMU transactions
_print_refresh_schedule enable dbms_output of materialized view refresh schedule
_private_memory_address Start address of large extent memory segment
_project_view_columns enable projecting out unreferenced columns of a view
_projection_pushdown projection pushdown
_projection_pushdown_debug level for projection pushdown debugging
_push_join_predicate enable pushing join predicate inside a view
_push_join_union_view enable pushing join predicate inside a union all view
_push_join_union_view2 enable pushing join predicate inside a union view
_px_async_getgranule asynchronous get granule in the slave
_px_broadcast_fudge_factor set the tq broadcasting fudge factor percentage
_px_buffer_ttl ttl for px mesg buffers in seconds
_px_compilation_debug debug level for parallel compilation
_px_compilation_trace tracing level for parallel compilation
_px_dynamic_opt turn off/on restartable qerpx dynamic optimization
_px_dynamic_sample_size num of samples for restartable qerpx dynamic optimization
_px_granule_size default size of a rowid range granule (in KB)
_px_index_sampling parallel query sampling for index create (100000 = 100%)
_px_kxib_tracing turn on kxib tracing
_px_load_publish_interval interval at which LMON will check whether to publish PX load
_px_loc_msg_cost CPU cost to send a PX message via shared memory
_px_max_granules_per_slave maximum number of rowid range granules to generate per slave
_px_min_granules_per_slave minimum number of rowid range granules to generate per slave
_px_minus_intersect enables pq for minus/interect operators
_px_net_msg_cost CPU cost to send a PX message over the internconnect
_px_no_granule_sort prevent parallel partition granules to be sorted on size
_px_no_stealing prevent parallel granule stealing in shared nothing environment
_px_nss_planb enables or disables NSS Plan B reparse with outline
_px_proc_constrain reduce parallel_max_servers if greater than (processes - fudge)
_px_pwg_enabled parallel partition wise group by enabled
_px_rownum_pd turn off/on parallel rownum pushdown optimization
_px_send_timeout IPC message send timeout value in seconds
_px_slaves_share_cursors slaves share cursors with QC
_px_trace px trace parameter
_px_xtgranule_size default size of a external table granule (in KB)
_qa_control Oracle internal parameter to control QA
_qa_lrg_type Oracle internal parameter to specify QA lrg type
_query_cost_rewrite perform the cost based rewrite with materialized views
_query_execution_cache_max_size max size of query execution cache
_query_rewrite_1 perform query rewrite before&after or only before view merging
_query_rewrite_2 perform query rewrite before&after or only after view merging
_query_rewrite_drj mv rewrite and drop redundant joins
_query_rewrite_expression rewrite with cannonical form for expressions
_query_rewrite_fpc mv rewrite fresh partition containment
_query_rewrite_fudge cost based query rewrite with MVs fudge factor
_query_rewrite_jgmigrate mv rewrite with jg migration
_query_rewrite_maxdisjunct query rewrite max disjuncts
_query_rewrite_or_error allow query rewrite, if referenced tables are not dataless
_query_rewrite_setopgrw_enable perform general rewrite using set operator summaries
_query_rewrite_vop_cleanup prune frocol chain before rewrite after view-merging
_rcfg_parallel_fixwrite if TRUE enables parallel fixwrite at reconfiguration
_rcfg_parallel_replay if TRUE enables parallel replay and cleanup at reconfiguration
_rcfg_parallel_verify if TRUE enables parallel verify at reconfiguration
_real_time_apply_arch_delay Archival delay with real time apply
_real_time_apply_sim Simulation value with real time apply
_realfree_heap_max_size minimum max total heap size, in Kbytes
_realfree_heap_mode mode flags for real-free heap
_realfree_heap_pagesize_hint hint for real-free page size in bytes
_recoverable_recovery_batch_percent Recoverable recovery batch size (percentage of buffer cache)
_recovery_asserts if TRUE, enable expensive integrity checks
_recovery_percentage recovery buffer cache percentage
_recovery_verify_writes enable thread recovery write verify
_recursive_imu_transactions recursive transactions may be IMU
_redo_compatibility_check general and redo/undo compatibility sanity check
_release_insert_threshold maximum number of unusable blocks to unlink from freelist
_reliable_block_sends if TRUE, block sends across interconnect are reliable
_remove_aggr_subquery enables removal of subsumed aggregated subquery
_resource_manager_always_on enable the resource manager always
_restore_spfile restore spfile to this location
_reuse_index_loop number of blocks being examine for index block reuse
_right_outer_hash_enable Right Outer/Semi/Anti Hash Enabled
_rman_io_priority priority at which rman backup i/o's are done
_rollback_segment_count number of undo segments
_rollback_segment_initial starting undo segment number
_rollback_stopat stop at -position to step rollback
_row_cache_cursors number of cached cursors for row cache management
_row_cr enable row cr for all sql
_row_locking row-locking
_rowsource_execution_statistics if TRUE, Oracle will collect rowsource statistics
_rowsource_statistics_sampfreq frequency of rowsource statistic sampling (must be a power of 2)
_rowsrc_trace_level Row source tree tracing level
_sample_rows_per_block number of rows per block used for sampling IO optimization
_second_spare_parameter second spare parameter - integer
_selfjoin_mv_duplicates control rewrite self-join algorithm
_selftune_checkpoint_write_pct Percentage of total physical i/os for self-tune ckpt
_selftune_checkpointing_lag Self-tune checkpointing lag the tail of the redo log
_send_ast_to_foreground if TRUE, send ast message to foreground
_send_close_with_block if TRUE, send close with block even with direct sends
_send_requests_to_pi if TRUE, try to send CR requests to PI buffers
_serial_direct_read enable direct read in serial
_serial_recovery force serial recovery or parallel recovery
_serializable serializable
_session_cached_instantiations Number of pl/sql instantiations to cache in a session.
_session_context_size session app context size
_session_idle_bit_latches one latch per session or a latch per group of sessions
_session_idle_check_interval Resource Manager session idle limit check interval in seconds
_session_kept_cursor_pins Number of cursors pins to keep in a session
_session_wait_history enable session wait history collection
_seventh_spare_parameter seventh spare parameter - string list
_shared_pool_max_size shared pool maximum size when auto SGA enabled
_shared_pool_reserved_min_alloc minimum allocation size in bytes for reserved area of shared pool
_shared_pool_reserved_pct percentage memory of the shared pool allocated for the reserved area
_short_stack_timeout_ms short stack timeout in ms
_shrunk_aggs_disable_threshold percentage of exceptions at which to switch to full length aggs
_shrunk_aggs_enabled enable use of variable sized buffers for non-distinct aggregates
_side_channel_batch_size number of messages to batch in a side channel message (DFS)
_side_channel_batch_timeout timeout before shipping out the batched side channelmessages
_simple_view_merging control simple view merging performed by the optimizer
_simulator_bucket_mindelta LRU bucket minimum delta
_simulator_internal_bound simulator internal bound percent
_simulator_lru_rebalance_sizthr LRU list rebalance threshold (size)
_simulator_lru_rebalance_thresh LRU list rebalance threshold (count)
_simulator_lru_scan_count LRU scan count
_simulator_pin_inval_maxcnt maximum count of invalid chunks on pin list
_simulator_reserved_heap_count simulator reserved heap count
_simulator_reserved_obj_count simulator reserved object count
_simulator_sampling_factor sampling factor for the simulator
_simulator_upper_bound_multiple upper bound multiple of pool size
_single_process run without detached processes
_sixth_spare_parameter sixth spare parameter - string list
_skgxp_reaping tune skgxp OSD reaping limit
_skgxp_udp_ach_reaping_time time in minutes before idle ach's are reaped
_skgxp_udp_hiwat_warn ach hiwat mark warning interval
_skgxp_udp_interface_detection_time_secs time in seconds between interface detection checks
_skgxp_udp_keep_alive_ping_timer_secs connection idle time in seconds before keep alive is initiated. min: 30 sec max: 1800 sec default: 300 sec
_skgxp_udp_timed_wait_buffering diagnostic log buffering space (in bytes) for timed wait (0 means unbufferd
_skgxp_udp_timed_wait_seconds time in seconds before timed wait is invoked
_skip_assume_msg if TRUE, skip assume message for consigns at the master
_slave_mapping_enabled enable slave mapping when TRUE
_slave_mapping_group_size force the number of slave group in a slave mapper
_small_table_threshold threshold level of table size for direct reads
_smm_advice_enabled if TRUE, enable v$pga_advice
_smm_advice_log_size overwrites default size of the PGA advice workarea history log
_smm_auto_cost_enabled if TRUE, use the AUTO size policy cost functions
_smm_auto_max_io_size Maximum IO size (in KB) used by sort/hash-join in auto mode
_smm_auto_min_io_size Minimum IO size (in KB) used by sort/hash-join in auto mode
_smm_bound overwrites memory manager automatically computed bound
_smm_control provides controls on the memory manager
_smm_freeable_retain value in KB of the instance freeable PGA memory to retain
_smm_isort_cap maximum work area for insertion sort(v1)
_smm_max_size maximum work area size in auto mode (serial)
_smm_min_size minimum work area size in auto mode
_smm_px_max_size maximum work area size in auto mode (global)
_smm_retain_size work area retain size in SGA for shared server sessions (0 for AUTO)
_smm_trace Turn on/off tracing for SQL memory manager
_smon_internal_errlimit limit of SMON internal errors
_smu_debug_mode <debug-flag> - set debug event for testing SMU operations
_smu_error_simulation_site site ID of error simulation in KTU code
_smu_error_simulation_type error type for error simulation in KTU code
_smu_timeouts comma-separated *AND double-quoted* list of AUM timeouts: mql, tur, sess_exprn, qry_exprn, slot_intvl
_sort_elimination_cost_ratio cost ratio for sort eimination under first_rows mode
_sort_multiblock_read_count multi-block read count for sort
_spin_count Amount to spin waiting for a latch
_spr_max_rules maximum number of rules in sql spreadsheet
_spr_push_pred_refspr push predicates through reference spreadsheet
_spr_use_AW_AS enable AW for hash table in spreadsheet
_spr_use_hash_table use hash table for spreadsheet
_sql_connect_capability_override SQL Connect Capability Table Override
_sql_connect_capability_table SQL Connect Capability Table (testing only)
_sql_hash_debug Hash value of the SQL statement to debug
_sql_model_unfold_forloops specifies compile-time unfolding of sql model forloops
_sqlexec_progression_cost sql execution progression monitoring cost threshold
_sqltune_category_parsed Parsed category qualifier for applying hintsets
_sta_control SQL Tuning Advisory control parameter
_stack_guard_level stack guard level
_static_backgrounds static backgrounds
_stn_trace SQL tracing parameter
_streams_pool_max_size streams pool maximum size when auto SGA enabled
_subquery_pruning_cost_factor subquery pruning cost factor
_subquery_pruning_enabled enable the use of subquery predicates to perform pruning
_subquery_pruning_mv_enabled enable the use of subquery predicates with MVs to perform pruning
_subquery_pruning_reduction subquery pruning reduction factor
_swrf_metric_frequent_mode Enable/disable SWRF Metric Frequent Mode Collection
_swrf_mmon_dbfus Enable/disable SWRF MMON DB Feature Usage
_swrf_mmon_flush Enable/disable SWRF MMON FLushing
_swrf_mmon_metrics Enable/disable SWRF MMON Metrics Collection
_swrf_on_disk_enabled Parameter to enable/disable SWRF
_swrf_test_action test action parameter for SWRF
_swrf_test_dbfus Enable/disable DB Feature Usage Testing
_synonym_repoint_tracing whether to trace metadata comparisons for synonym repointing
_sysaux_test_param test parameter for SYSAUX
_system_index_caching optimizer percent system index caching
_system_trig_enabled are system triggers enabled
_ta_lns_wait_for_arch_log LNS Wait time for arhcived version of online log
_table_lookup_prefetch_size table lookup prefetch vector size
_table_lookup_prefetch_thresh table lookup prefetch threshold
_table_scan_cost_plus_one bump estimated full table scan and index ffs cost by one
_target_rba_max_lag_percentage target rba max log lag percentage
_tdb_debug_mode set debug mode for testing transportable database
_temp_tran_block_threshold number of blocks for a dimension before we temp transform
_temp_tran_cache determines if temp table is created with cache option
_test_ksusigskip test the function ksusigskip
_test_param_1 test parmeter 1 - integer
_test_param_2 test parameter 2 - string
_test_param_3 test parameter 3 - string
_test_param_4 test parameter 4 - string list
_test_param_5 test parmeter 5 - deprecated integer
_test_param_6 test parmeter 6 - size (ub8)
_third_spare_parameter third spare parameter - integer
_threshold_alerts_enable if 1, issue threshold-based alerts
_total_large_extent_memory Total memory for allocating large extents
_tq_dump_period time period for duping of TQ statistics (s)
_trace_archive start DIAG process
_trace_buffer_flushes trace buffer flushes if otrace cacheIO event is set
_trace_buffer_gets trace kcb buffer gets if otrace cacheIO event is set
_trace_buffer_wait_timeouts trace buffer busy wait timeouts
_trace_buffer_wrap_timestamp enable KST timestamp on trace buffer wrap
_trace_buffers trace buffer sizes per process
_trace_cr_buffer_creates trace cr buffer creates if otrace cacheIO event is set
_trace_events trace events enabled at startup
_trace_file_size maximum size of trace file (in bytes)
_trace_files_public Create publicly accessible trace files
_trace_flush_processes trace data archived by DIAG for these processes
_trace_multi_block_reads trace multi_block reads if otrace cacheIO event is set
_trace_navigation_scope enabling trace navigation linking
_trace_options trace data flush options
_trace_pin_time trace how long a current pin is held
_trace_processes enable KST tracing in process
_transaction_auditing transaction auditing records generated in the redo log
_transaction_recovery_servers max number of parallel recovery slaves that may be used
_truncate_optimization_enabled do truncate optimization if set to TRUE
_tsm_connect_string TSM test connect string
_tsm_disable_auto_cleanup Disable TSM auto cleanup actions
_tts_allow_charset_mismatch allow plugging in a tablespace with an incompatible character set
_two_pass enable two-pass thread recovery
_two_pass_reverse_polish_enabled uses two-pass reverse polish alg. to generate canonical forms
_uga_cga_large_extent_size UGA/CGA large extent size
_ultrafast_latch_statistics maintain fast-path statistics for ultrafast latches
_undo_autotune enable auto tuning of undo_retention
_undo_debug_mode debug flag for undo related operations
_undo_debug_usage invoke undo usage functions for testing
_union_rewrite_for_gs expand queries with GSets into UNIONs for rewrite
_unnest_subquery enables unnesting of correlated subqueries
_unused_block_compression enable unused block compression
_use_column_stats_for_function enable the use of column statistics for DDP functions
_use_ism Enable Shared Page Tables - ISM
_use_ism_for_pga Use ISM for allocating large extents
_use_nosegment_indexes use nosegment indexes in explain plan
_use_realfree_heap use real-free based allocator for PGA memory
_use_seq_process_cache whether to use process local seq cache
_use_vector_post use vector post
_validate_flashback_database Scan database to validate result of flashback database
_vendor_lib_loc Vendor library search root directory
_verify_flashback_redo Verify that the redo logs needed for flashback are available
_verify_undo_quota TRUE - verify consistency of undo quota statistics
_very_large_partitioned_table very_large_partitioned_table
_wait_for_sync wait for sync on commit MUST BE ALWAYS TRUE
_walk_insert_threshold maximum number of unusable blocks to walk across freelist
_watchpoint_on is the watchpointing feature turned on?
_windowfunc_optimization_settings settings for window function optimizations
_write_clones write clones flag
_xpl_peeked_binds_log_size maximum bytes for logging peeked bind values for V$SQL_PLAN (0 = OFF)
_xpl_trace Explain Plan tracing parameter
_xsolapi_auto_materialization_bound OLAP API lower bound for auto materialization.
_xsolapi_auto_materialization_type OLAP API behavior for auto materialization
_xsolapi_debug_output OLAP API debug output disposition
_xsolapi_densify_cubes OLAP API cube densification
_xsolapi_dimension_group_creation OLAP API symmetric overfetch
_xsolapi_fetch_type OLAP API fetch type
_xsolapi_load_at_process_start When to load OLAP API library at server process start
_xsolapi_materialization_rowcache_min_rows_for_use OLAP API min number of rows required to use rowcache in query materialization
_xsolapi_materialize_sources OLAP API Enable source materialization
_xsolapi_source_trace OLAP API output Source definitions to trace file
_xsolapi_sql_all_multi_join_non_base_hints OLAP API multi-join non-base hints
_xsolapi_sql_all_non_base_hints OLAP API non-base hints
_xsolapi_sql_auto_dimension_hints OLAP API enable automatic dimension hints
_xsolapi_sql_auto_measure_hints OLAP API enable automatic measure hints
_xsolapi_sql_dimension_hints OLAP API dimension hints
_xsolapi_sql_hints OLAP API generic hints
_xsolapi_sql_measure_hints OLAP API measure hints
_xsolapi_sql_optimize OLAP API enable optimization
_xsolapi_sql_prepare_stmt_cache_size OLAP API prepare statement cache size
_xsolapi_sql_remove_columns OLAP API enable remove unused columns optimizations
_xsolapi_sql_result_set_cache_size OLAP API result set cache size
_xsolapi_sql_symmetric_predicate OLAP API enable symmetric predicate for dimension groups
_xsolapi_sql_top_dimension_hints OLAP API top dimension hints
_xsolapi_sql_top_measure_hints OLAP API top measure hints
_xsolapi_sql_use_bind_variables OLAP API enable bind variables optimization
_xt_coverage external tables code coverage parameter
_xt_trace external tables trace parameter
_xtbuffer_size buffer size in KB needed for populate/query operation
_xtts_allow_pre10 allow cross platform for pre10 compatible tablespace
_xtts_set_platform_info set cross platform info during file header read
_yield_check_interval interval to check whether actses should yield

変更する際には、該当パラメータについて google とかでよく調べてからが良いかと思います。より詳しく知るならこちらが参考になるかと。

Oracle Utilities: Using Hidden Programs, Import/Export, SQL*Loader, Oradebug, Dbverify, Tkprof and More (Oracle in-Focus)
Dave Moore Don Burleson
Rampant Tech Pr (2003/08/01)
売り上げランキング: 134437
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