Oracle 19c 参数列表及概要介绍

Posted 2023-02-27 SQLplusDB

Oracle 19c包括5412个参数，各参数概要内容如下：

PARAMETER	DESCRIPTION	VALUE
__asm_max_connected_clients	The high water mark value for connected clients	3
__data_transfer_cache_size	Actual size of data transfer cache	0
__db_16k_cache_xmem_size_metadata	Size of extended cache metadata for 16k buffer pool	0
__db_2k_cache_xmem_size_metadata	Size of extended cache metadata for 2k buffer pool	0
__db_32k_cache_xmem_size_metadata	Size of extended cache metadata for 32k buffer pool	0
__db_4k_cache_xmem_size_metadata	Size of extended cache metadata for 4k buffer pool	0
__db_8k_cache_xmem_size_metadata	Size of extended cache metadata for 8k buffer pool	0
__db_cache_size	Actual size of DEFAULT buffer pool for standard block size buffers	1459617792
__db_cache_xmem_size_metadata	Size of extended memory metadata of DEFAULT buffer pool for standard block size buffers	0
__db_keep_cache_xmem_size_metadata	Size of extended cache metadata of KEEP buffer pool for standard block size buffers	0
__db_recycle_cache_xmem_size_metadata	Size of extended memory metadata of recycle buffer pool for standard block size buffers	0
__dg_broker_service_names	service names for broker use
__inmemory_ext_roarea	Actual size in bytes of inmemory ro extension area	0
__inmemory_ext_rwarea	Actual size in bytes of inmemory rw extension area	0
__java_pool_size	Actual size in bytes of java pool	0
__large_pool_size	Actual size in bytes of large pool	33554432
__latch_test_param	latch test parameter	0
__maintenance_is_planned	Is maintenance scheduled soon?	0
__memoptimize_xmem_pool_size_metadata	Size of extended cache metadata of MEMOPTIMIZE buffer pool for standard block size buffers	0
__oracle_base	ORACLE_BASE
__persistent_cl2_slave_size	Actual size of slave cluster flash cache for default block size	0
__pga_aggregate_target	Current target size for the aggregate PGA memory consumed	520093696
__reload_lsnr	reload listener
__sga_current_size	Current size for PDB SGA	0
__sga_target	Actual size of SGA	2063597568
__shared_io_pool_size	Actual size of shared IO pool	100663296
__shared_pool_size	Actual size in bytes of shared pool	452984832
__streams_pool_size	Actual size in bytes of streams pool	0
__unified_pga_pool_size	Actual size in bytes of unified pga pool	0
__wait_test_param	wait test parameter	0
_4030_dump_bitvec	bitvec to specify dumps prior to 4030 error	4095
_4031_dump_bitvec	bitvec to specify dumps prior to 4031 error	67194879
_4031_dump_interval	Dump 4031 error once for each n-second interval	300
_4031_max_dumps	Maximum number of 4031 dumps for this process	100
_4031_sga_dump_interval	Dump 4031 SGA heapdump error once for each n-second interval	3600
_4031_sga_max_dumps	Maximum number of SGA heapdumps	10
_abort_on_mrp_crash	abort database instance when MRP crashes	FALSE
_abort_recovery_on_join	if TRUE, abort recovery on join reconfigurations	FALSE
_ac_enable_dscn_in_rac	Enable Dependent Commit SCN tracking	FALSE
_ac_strict_SCN_check	enforce strict SCN check for AC replay across DG failover	FALSE
_accept_versions	List of parameters for rolling operation
_active_instance_count	number of active instances in the cluster database
_active_session_idle_limit	active session idle limit	5
_active_session_legacy_behavior	active session legacy behavior	FALSE
_active_standby_fast_reconfiguration	if TRUE optimize dlm reconfiguration for active/standby OPS	TRUE
_adaptive_direct_read	Adaptive Direct Read	TRUE
_adaptive_direct_write	Adaptive Direct Write	TRUE
_adaptive_fetch_enabled	enable/disable adaptive fetch in parallel group by	TRUE
_adaptive_log_file_sync_high_switch_freq_threshold	Threshold for frequent log file sync mode switches (per minute)	3
_adaptive_log_file_sync_poll_aggressiveness	Polling interval selection bias (conservative=0, aggressive=100)	0
_adaptive_log_file_sync_sampling_count	Evaluate post/wait versus polling every N writes	128
_adaptive_log_file_sync_sampling_time	Evaluate post/wait versus polling every N seconds	3
_adaptive_log_file_sync_sched_delay_window	Window (in seconds) for measuring average scheduling delay	60
_adaptive_log_file_sync_use_polling_threshold	Ratio of redo synch time to expected poll time as a percentage	110
_adaptive_log_file_sync_use_postwait_threshold	Percentage of foreground load from when post/wait was last used	50
_adaptive_log_file_sync_use_postwait_threshold_aging	Permille of foreground load from when post/wait was last used	1001
_adaptive_scalable_log_writer_disable_worker_threshold	Percentage of overlap across multiple outstanding writes	50
_adaptive_scalable_log_writer_enable_worker_aging	Per million of redo gen rate when LGWR workers were last used	999900
_adaptive_scalable_log_writer_enable_worker_threshold	Increase in redo generation rate as a percentage	200
_adaptive_scalable_log_writer_sampling_count	Evaluate single versus scalable LGWR every N writes	128
_adaptive_scalable_log_writer_sampling_time	Evaluate single versus scalable LGWR every N seconds	3
_adaptive_window_consolidator_enabled	enable/disable adaptive window consolidator PX plan	TRUE
_add_col_optim_enabled	Allows new add column optimization	TRUE
_add_nullable_column_with_default_optim	Allows add of a nullable column with default optimization	TRUE
_add_stale_mv_to_dependency_list	add stale mv to dependency list	TRUE
_add_trim_for_nlssort	add trimming for fixed char semantics	TRUE
_addm_auto_actions_enabled	determines if ADDM can automatically implement its recommendations	TRUE
_addm_auto_enable	governs whether ADDM gets run automatically after every AWR snapshot	TRUE
_addm_skiprules	comma-separated list of ADDM nodes to skip
_addm_version_check	governs whether ADDM checks the input AWR snapshot version	TRUE
_adg_adt_redirect_apply_lag_threshold	Maximum centi-secends of apply lag threshold	12000
_adg_adt_redirect_catchup_wait_time	Maximum centi-secends for standby to catch up	12000
_adg_auto_close_pdb	ADG recovery auto close PDB upon PDB drop/unplug/rename marker	TRUE
_adg_count_beyond_limit	Count the total number of objects if beyond redo marker length.	0
_adg_defer_segstat	Defer the segment statistics update on standby.	TRUE
_adg_distributed_lockmaster	standby runs under ADG distributed lockmaster mode	FALSE
_adg_influx_qscn_gap	maximium time gap between influx scn and qscn update in seconds	0
_adg_instance_recovery	enable ADG instance recovery	TRUE
_adg_objectlock_attempts	Maximum attemps for objectlock get on ADG	2
_adg_objectlock_maxnum	The maximum limit of the objectlock number on ADG	1000
_adg_objectlock_timeout	timeout for objectlock get on ADG in centiseconds	0
_adg_parselock_timeout	timeout for parselock get on ADG in centiseconds	0
_adg_parselock_timeout_sleep	sleep duration after a parselock timeout on ADG in milliseconds	100
_adg_redirect_upd_to_primary_max_retries	max retries for ADT redirect to Primary from ADG	500
_adjust_literal_replacement	If TRUE, we will adjust the SQL/PLUS output	FALSE
_adr_migrate_runonce	Enable/disable ADR Migrate Runonce action	TRUE
_advanced_index_compression_cmp_options	advanced index compression cmp options	0
_advanced_index_compression_opt_options	advanced index compression opt options	0
_advanced_index_compression_options	advanced index compression options	0
_advanced_index_compression_options_value	advanced index compression options2	0
_advanced_index_compression_recmp_crsz	advanced index compression limit recomp cr	10
_advanced_index_compression_recmp_cusz	advanced index compression limit recomp cu	90
_advanced_index_compression_recmp_nprg	advanced index compression limit recomp pu	10
_advanced_index_compression_trace	advanced index compression trace	0
_advanced_index_compression_tst_options	advanced index compression tst options	0
_advanced_index_compression_umem_options	advanced index compression umem options	2147483647
_afd_disable_fence	Disable AFD fencing	FALSE
_affinity_on	enable/disable affinity at run time	TRUE
_aged_out_cursor_cache_time	number of seconds an aged out session cached cursor stay in cache	300
_aggregation_optimization_settings	settings for aggregation optimizations	0
_aiowait_timeouts	Number of aiowait timeouts before error is reported	100
_alert_expiration	seconds before an alert message is moved to exception queue	604800
_alert_message_cleanup	Enable Alert Message Cleanup	1
_alert_message_purge	Enable Alert Message Purge	1
_alert_post_background	Enable Background Alert Posting	1
_all_shared_dblinks	treat all dblinks as shared
_alloc_perm_as_free	allocate permanent chunks as freeable	FALSE
_allocate_creation_order	should files be examined in creation order during allocation	FALSE
_allocate_flashback_buffer	Allocate flashback buffer at mount time even if flashback is off	FALSE
_allocation_update_interval	interval at which successful search in L1 should be updated	3
_allow_cell_smart_scan_attr	Allow checking smart_scan_capable Attr	TRUE
_allow_commutativity	allow for commutativity of +, * when comparing expressions	TRUE
_allow_compatibility_adv_w_grp	allow advancing DB compatibility with guaranteed restore points	FALSE
_allow_convert_to_standby	allow convert to standby to go through	FALSE
_allow_cross_endian_dictionary	Allow cross-endian data dictionary	FALSE
_allow_drop_snapshot_standby_grsp	Allow dropping snapshot standby guaranteed restore point	FALSE
_allow_drop_ts_with_grp	Allow drop Tablespace with guaranteed restore points	FALSE
_allow_error_simulation	Allow error simulation for testing	FALSE
_allow_file_1_offline_error_1245	don’t signal ORA-1245 due to file 1 being offline	FALSE
_allow_insert_with_update_check	Allow INSERT as statement_types when update_check is FALSE	FALSE
_allow_level_without_connect_by	allow level without connect by	FALSE
_allow_read_only_corruption	allow read-only open even if database is corrupt	FALSE
_allow_resetlogs_corruption	allow resetlogs even if it will cause corruption	FALSE
_allow_terminal_recovery_corruption	Finish terminal recovery even if it may cause corruption	FALSE
_AllowMultInsteadofDDLTrigger	Oracle internal parameter to allow multiple instead of DDL triggers	0
_alter_adg_redirect_behavior	Alter ADG’s Redirection behavior	none
_alter_upgrade_signature_only	alter table upgrade only sets signature	FALSE
_alternate_iot_leaf_block_split_points	enable alternate index-organized table leaf-block split-points	TRUE
_always_anti_join	always use this method for anti-join when possible	CHOOSE
_always_semi_join	always use this method for semi-join when possible	CHOOSE
_always_star_transformation	always favor use of star transformation	FALSE
_always_vector_transformation	always favor use of vector transformation	FALSE
_analyze_comprehensive	Analyze comprehensive mode	FALSE
_and_pruning_enabled	allow partition pruning based on multiple mechanisms	TRUE
_app_container_debug	Enable Debug tracing in Application container	0
_app_default_containers	containers_default and container_map enabled by default on MDL application object	FALSE
_app_ignore_errors	ignore errors during containers() on application object	TRUE
_app_replay_silent_errors	silently ignore all errors during application sync	FALSE
_application_purge_enabled	Is an application purge allowed	TRUE
_application_script	Running an application script	FALSE
_apppdb_multi_slave_sync	Multiple slaves used during Application sync	FALSE
_appqos_cdb_setting	QoSM CDB Performance Class Setting	0
_appqos_po_multiplier	Multiplier for PC performance objective value	1000
_appqos_qt	System Queue time retrieval interval	10
_approx_cnt_distinct_gby_pushdown	perform group-by pushdown for approximate distinct count query	choose
_approx_cnt_distinct_optimization	settings for approx_count_distinct optimizations	0
_approx_perc_sampling_err_rate	error rate percentage of approximate percentile using sampling	2
_approx_percentile_optimization	settings for approx_percentile optimization	0
_apx_root_directory	APX default root directory	APX
_aq_addpt_batch_size	Add PT batch Size	1
_aq_dly_bkt	Delay Bucket Size	2
_aq_dq_prefetch_Siz	AQ PT DQ prefech Size	5
_aq_dqblocks_in_cache	deq blocks in cache	0
_aq_droppt_batch_size	Drop PT batch Size	5
_aq_free_list_pools	state object and transaction memory pools	10
_aq_init_shards	Minimum enqueue shards per queue at an instance	5
_aq_ipc_max_slave	maximum number of slaves for knlpipcm	10
_aq_latency_absolute_threshold	Absolute threshold greater than average latency	300
_aq_latency_relative_threshold	Relative threshold of average latency	100
_aq_lb_cycle	Time(seconds) between consecutive AQ load balancing efforts	120
_aq_lb_garbage_col_interval	AQ LB garbage collect interval	600
_aq_lb_stats_collect_cycle	Time(seconds) between consecutive AQ load statistics collection	45
_aq_lb_subht_bkt_ltch	AQ LB subscriber ht bucket latches	32
_aq_lb_subht_elm_ltch	AQ LB subscriber ht element latches	128
_aq_lookback_size	AQ PT Look Back Size	60
_aq_max_pdb_close_msg	Max Number of AQ Recovery Messages when pdb is closed	1
_aq_max_scan_delay	Maximum allowable scan delay for AQ indexes and IOTs	1500
_aq_opt_background_enabled	AQ: OPT Operations Background enabled	TRUE
_aq_opt_enabled	AQ: OPT Operations enabled	TRUE
_aq_opt_fudge_factor	AQ: OPT Fudge Factor for pre-fretching	500
_aq_opt_min_evict_memory	AQ: OPT LWM memory for eviction to stop	0
_aq_opt_preevict_dop	AQ: OPT Background: PreEvict Degree Of Parallelism	3
_aq_opt_prefetch_dop	AQ: OPT Background: Prefetch Degree Of Parallelism	3
_aq_opt_prefetch_horizon	AQ: OPT horizon for pre-fretching	60
_aq_opt_stat_window	AQ: OPT Subscriber Statistics Window Size	21600
_aq_opt_stop_stat	AQ: OPT Stop Collection of Subscriber Statistics	FALSE
_aq_pt_processes	Partition background processes	10
_aq_pt_shrink_frequency	PT shrink window Size	1450
_aq_pt_statistics_window	PT statistics sample window Size	60
_aq_qt_prefetch_Size	AQ PT QT prefech Size	5
_aq_retry_timeouts	retry timeouts	0
_aq_scrambled_deqlog	scrambled deqlog	1
_aq_shard_bitmap_child_latches	Bitmap child latches	32
_aq_shard_child_latches	Shard child latches	512
_aq_shard_prty_latches	Shard priority child latches	16
_aq_shard_retry_child_latches	Retry child latches	32
_aq_shard_sub_child_Elem_latches	Subscriber Element child latches	1024
_aq_shard_sub_child_latches	Subscriber child latches	512
_aq_shard_txn_child_latches	Txn child latches	128
_aq_stop_backgrounds	Stop all AQ background processes	FALSE
_aq_streaming_threshold	large payload threshold size	10485760
_aq_subshard_Size	Sub Shard Size	20000
_aq_subshards_per_dqpartition	SubShards Per Deq Partition	1
_aq_subshards_per_qpartition	SubShards Per Q Partition	1
_aq_tm_deqcountinterval	dequeue count interval for Time Managers to cleanup DEQ IOT BLOCKS	0
_aq_tm_scanlimit	scan limit for Time Managers to clean up IOT	0
_aq_tm_statistics_duration	statistics collection window duration	0
_aq_truncpt_batch_size	Trunc PT batch Size	1
_aq_Txn_ht_sz	Message cache Txn Hash table size	1024
_aq_uncached_stats	Uncached Stats	0
_aq_x_mode	AQ - cross mode	1
_aq_x_msg_size	AQ cross single message buffer size	32768
_aqsharded_cache_limit	Limit for cached enqueue/dequeue operations	0
_arch_comp_dbg_scan	archive compression scan debug	0
_arch_comp_dec_block_check_dump	decompress archive compression blocks for checking and dumping	1
_arch_compress_checksums	enable/disable row checksums for archive compressed blocks	FALSE
_arch_compression	archive compression enabled	TRUE
_arch_io_slaves	ARCH I/O slaves	0
_arch_sim_mode	Change behavior of local archiving	0
_array_cdb_view_enabled	array mode enabled for CDB views	TRUE
_array_update_vector_read_enabled	Enable array update vector read	FALSE
_ash_compression_enable	To enable or disable string compression in ASH	TRUE
_ash_disk_filter_ratio	Ratio of the number of in-memory samples to the number of samples actually written to disk	10
_ash_disk_write_enable	To enable or disable Active Session History flushing	TRUE
_ash_dummy_test_param	Oracle internal dummy ASH parameter used ONLY for testing!	0
_ash_eflush_trigger	The percentage above which if the in-memory ASH is full the emergency flusher will be triggered	66
_ash_enable	To enable or disable Active Session sampling and flushing	TRUE
_ash_min_mmnl_dump	Minimum Time interval passed to consider MMNL Dump	90
_ash_progressive_flush_interval	ASH Progressive Flush interval in secs	300
_ash_sample_all	To enable or disable sampling every connected session including ones waiting for idle waits	FALSE
_ash_sampling_interval	Time interval between two successive Active Session samples in millisecs	1000
_ash_size	To set the size of the in-memory Active Session History buffers	1048618
_asm_access	ASM File access mechanism	auto
_asm_access_assume_local	Assume ios client is in the same cluster as IOS	FALSE
_asm_acd_chunks	initial ACD chunks created	1
_asm_admin_with_sysdba	Does the sysdba role have administrative privileges on ASM?	FALSE
_asm_allow_appliance_dropdisk_noforce	Allow DROP DISK/FAILUREGROUP NOFORCE on ASM Appliances	FALSE
_asm_allow_dangerous_unprotected_volumes	Disable checking for unprotected volumes in mirrored disk groups	FALSE
_asm_allow_dgname_special_chars	Enable the use of special characters in diskgroup names	FALSE
_asm_allow_foreign_siteguids	Disable checking for foreign siteguid on a given node
_asm_allow_lvm_resilvering	Enable disk resilvering for external redundancy	TRUE
_asm_allow_older_clients	Allow older clients to connect to the ASM server	FALSE
_asm_allow_only_raw_disks	Discovery only raw devices	TRUE
_asm_allow_prepare_split	Allow database prepare and split in non-appliance mode	TRUE
_asm_allow_small_memory_target	Allow a small memory_target for ASM instances	FALSE
_asm_allow_system_alias_rename	if system alias renaming is allowed	FALSE
_asm_allow_unsafe_reconnect	attempt unsafe reconnect to ASM	TRUE
_asm_allowdegeneratemounts	Allow force-mounts of DGs w/o proper quorum	FALSE
_asm_appliance_config_file	Appliance configuration file name
_asm_appliance_disable_fg_check	Disable failure group check	FALSE
_asm_appliance_ignore_oak	Ignore OAK appliance library	FALSE
_asm_appliance_slot_from_path	Get appliance disk slot from disk path	FALSE
_asm_asmb_max_wait_timeout	timeout before processes are signaled with network interrupt	6
_asm_asmb_rcvto	Receive timeout for ASMB in seconds	10
_asm_async_scrub_reap_wait	Async scrubbing reaping IO wait in microseconds	100000
_asm_audit_sp_param	ASM audit spare parameter
_asm_ausize	allocation unit size	1048576
_asm_auto_online_interval	auto online interval
_asm_automatic_rezone	automatically rebalance free space across zones	TRUE
_asm_avoid_pst_scans	Avoid PST Scans	TRUE
_asm_blksize	metadata block size	4096
_asm_br_listener_port	Bitrotter listener port for testing purpose	51521
_asm_brfuzz_ios_lsnrport	IOS listener port for fuzzing with Bitrotter	0
_asm_cancel_alert_time	Wait time for I/O cancel alert message (in seconds)	600
_asm_cancel_delta	Delta timeout for blocking big writes in milliseconds	75000
_asm_cclient_cleanup_timeout	timeout before cleaning up remote cluster clients	300
_asm_check_for_misbehaving_cf_clients	check for misbehaving CF-holding clients	FALSE
_asm_compatibility	default ASM compatibility level	11.2.0.2
_asm_dba_batch	ASM Disk Based Allocation Max Batch Size	500000
_asm_dba_spcchk_thld	ASM Disk Based Allocation Space Check Threshold	100000
_asm_dba_threshold	ASM Disk Based Allocation Threshold	0
_asm_dbmsdg_nohdrchk	dbms_diskgroup.checkfile does not check block headers	FALSE
_asm_dependency_under_cfenqueue	Send dependency request if holding CF enqueue	TRUE
_asm_diag_dead_clients	diagnostics for dead clients	FALSE
_asm_direct_con_expire_time	Expire time for idle direct connection to ASM instance	120
_asm_disable_amdu_dump	Disable AMDU dump	FALSE
_asm_disable_async_msgs	disable async intra-instance messaging	FALSE
_asm_disable_dangerous_failgroup_checking	Disable checking for dubious failgroup configurations	FALSE
_asm_disable_failgroup_count_checking	Disable checking for failure group count	FALSE
_asm_disable_failgroup_size_checking	Disable checking for failure group size	FALSE
_asm_disable_multiple_instance_check	Disable checking for multiple ASM instances on a given node	FALSE
_asm_disable_patch_compat	disable DG patch compatibility checks	FALSE
_asm_disable_proact_client_cleanup	disable proactive client cleanup	FALSE
_asm_disable_profilediscovery	disable profile query for discovery	FALSE
_asm_disable_request_tracer	Disable kfioRqTracer	TRUE
_asm_disable_smr_creation	Do Not create smr	FALSE
_asm_disable_ufg_dump	disable terminated umbilicus diagnostic	FALSE
_asm_disable_ufgmemberkill	disable ufg member kill	FALSE
_asm_disable_vtoc_check	Disable vtoc/sector 0 check	FALSE
_asm_disable_vxn_map_messages	disable using vxn map messages	FALSE
_asm_disk_repair_time	seconds to wait before dropping a failing disk	14400
_asm_diskerr_traces	Number of read/write errors per disk a process can trace	2
_asm_diskgroups2	disk groups to mount automatically set 2
_asm_diskgroups3	disk groups to mount automatically set 3
_asm_diskgroups4	disk groups to mount automatically set 4
_asm_emulate_nfs_disk	Emulate NFS disk test event	FALSE
_asm_emulmax	max number of concurrent disks to emulate I /O errors	10000
_asm_emultimeout	timeout before emulation begins (in 3s ticks)	0
_asm_enable_batch_scrub	Allow scrubbing verification to run in batch mode	FALSE
_asm_enable_kfios	Enable KFIOS module	FALSE
_asm_enable_kfks	Enable KFKS module	FALSE
_asm_enable_lostwrite_scrub	Allow lost write detection in scrubbing	FALSE
_asm_enable_multiple_asmb	Allow the ASM client to have multiple ASMB background processes	TRUE
_asm_enable_parity_datafile_creation	Enable parity datafiles creation	FALSE
_asm_enable_parity_scrub	Allow scrubbing parity files	FALSE
_asm_enable_parityfile_creation	Enable parity files creation	TRUE
_asm_enable_repair_lostwrite_scrub	Allow repairing lost write in scrubbing	FALSE
_asm_enable_xrov	Enable XROV capability	FALSE
_asm_evenread	ASM Even Read level	2
_asm_evenread_alpha	ASM Even Read Alpha	0
_asm_evenread_alpha2	ASM Even Read Second Alpha	0
_asm_evenread_faststart	ASM Even Read Fast Start Threshold	0
_asm_fail_random_rx	Randomly fail some RX enqueue gets	FALSE
_asm_fd_cln_idle_sess_twait	Idle session time wait to run ASM FD cleanup	60000000
_asm_fd_cln_on_fg	ASM stale FD cleanup on foregrounds	TRUE
_asm_fob_tac_frequency	Timeout frequency for FOB cleanup	9
_asm_force_parity_extent_check	Force parity extent integrity check	FALSE
_asm_force_paritycheck_rebalance	Force parity extent integrity check during rebalance	FALSE
_asm_force_quiesce	Force diskgroup quiescing	FALSE
_asm_force_vam	force VAM for external redundancy	FALSE
_asm_global_dump_level	System state dump level for ASM asserts	267
_asm_hbeatiowait	number of secs to wait for PST Async Hbeat IO return	120
_asm_hbeatwaitquantum	quantum used to compute time-to-wait for a PST Hbeat check	2
_asm_healthcheck_timeout	seconds until health check takes action	180
_asm_idn_processes	number of global open processes	0
_asm_imbalance_tolerance	hundredths of a percentage of inter-disk imbalance to tolerate	3
_asm_instlock_quota	ASM Instance Lock Quota	0
_asm_ios_network_domains	number of domains in ASM IOSERVER instance	0
_asm_ios_network_processes	number network processes per domain in ASM IOSERVER instance	0
_asm_iosconnect_timeout	Time (in 3secs multiples) before db gives up on connecting to IOS	0
_asm_iostat_latch_count	ASM I/O statistics latch count	31
_asm_iowp_max_async	maximum async IOs per IO worker process	0
_asm_kfdpevent	KFDP event	0
_asm_kill_unresponsive_clients	kill unresponsive ASM clients	TRUE
_asm_libraries	library search order for discovery	ufs
_asm_log_scale_rebalance	Rebalance power uses logarithmic scale	FALSE
_asm_lsod_bucket_size	ASM lsod bucket size	67
_asm_max_aux_cods	maximum number of auxiliary cods in sparse disk groups	5
_asm_max_clients	maximum number of clients this IOS instance can service	1000
_asm_max_cod_strides	maximum number of COD strides	10
_asm_max_connected_clients	The high water mark value for connected clients	3
_asm_max_parallelios	Maximum simultaneous outstanding IOs	256
_asm_max_redo_buffer_size	asm maximum redo buffer size	2097152
_asm_maxio	Maximum size of individual I/O request	1048576
_asm_min_compatibility	default mininum ASM compatibility level	11.2.0.2
_asm_netp_factor	number of network processes per net	0
_asm_netp_iosize	maximum io size	0
_asm_network_timeout	Keepalive timeout for ASM network connections	1
_asm_networks	ASM network subnet addresses
_asm_node_site_guid	ASM site GUID of node
_asm_nodekill_escalate_time	secs until escalating to nodekill if fence incomplete	180
_asm_noevenread_diskgroups	List of disk groups having even read disabled
_asm_oda_type	ODA Type
_asm_odapremchk	Check premature storage for ODA	TRUE
_asm_offload_all	Offload all write operations to Exadata cells, when supported	FALSE
_asm_partner_target_disk_part	target maximum number of disk partners for repartnering	8
_asm_partner_target_fg_rel	target maximum number of failure group relationships for repartnering	4
_asm_primary_load	Number of cycles/extents to load for non-mirrored files	1
_asm_primary_load_cycles	True if primary load is in cycles, false if extent counts	TRUE
_asm_procs_trace_diskerr	Number of processes allowed to trace a disk failure	5
_asm_proxy_online_restart	Allow patching while ADVM volumes are online	0
_asm_proxy_startwait	Maximum time to wait for ASM proxy connection	60
_asm_pstonpartners	Select ideal PST disks following partnership	TRUE
_asm_random_zone	Random zones for new files	FALSE
_asm_read_cancel	Read cancel timeout in milliseconds	AUTO
_asm_read_cancel_back_out	Time period in milliseconds when no reads are issued to a disk after a read is cancelled	5000
_asm_rebalance_estimates_process	Perform rebalance estimates in ARB-A process	TRUE
_asm_rebalance_plan_size	maximum rebalance work unit	120
_asm_rebalance_space_errors	number of out of space errors allowed before aborting rebalance	1000
_asm_reloc_cic	Allow relocation during rolling migration	FALSE
_asm_relocation_async_lock_count	limit of asynchronous map locks during relocation	128
_asm_relocation_ignore_hard_failure	ignore HARD for relocation	0
_asm_relocation_scheme	ASM allocation / relocation scheme	alloc_p2 alloc_s3 reb_p2 reb_s1 bal_p2 bal_s3 prep_p2 prep_s3
_asm_relocation_trace	enable extent relocation tracing	FALSE
_asm_remote_client_timeout	timeout before killing disconnected remote clients	300
_asm_repairquantum	quantum (in 3s) used to compute elapsed time for disk drop	60
_asm_reserve_slaves	reserve ASM slaves for CF txns	TRUE
_asm_resyncCkpt	number of extents to resync before flushing checkpoint	1024
_asm_root_directory	ASM default root directory	ASM
_asm_runtime_capability_volume_support	runtime capability for volume support returns supported	FALSE
_asm_scrub_async	Enable asynchronous scrubbing	TRUE
_asm_scrub_disable_cod	Disable scrubbing COD	FALSE
_asm_scrub_limit	ASM disk scrubbing power	AUTO
_asm_scrub_strict	Enable strict scrubbing mode	FALSE
_asm_scrub_unmatched_dba	Scrub maximum number of blocks with unmatched DBA	1024
_asm_secondary_load	Number of cycles/extents to load for mirrored files	10000
_asm_secondary_load_cycles	True if secondary load is in cycles, false if extent counts	FALSE
_asm_serialize_volume_rebalance	Serialize volume rebalance	FALSE
_asm_shadow_cycle	Inverse shadow cycle requirement	3
_asm_skip_dbfile_ios	Skip I/Os to database files (do only ASM metadata I/O)	FALSE
_asm_skip_diskval_check	skip client side discovery for disk revalidate	FALSE
_asm_skip_rename_check	skip the checking of the clients for s/w compatibility for rename	FALSE
_asm_skip_resize_check	skip the checking of the clients for s/w compatibility for resize	FALSE
_asm_storagemaysplit	PST Split Possible	FALSE
_asm_stripesize	ASM file stripe size	131072
_asm_stripewidth	ASM file stripe width	8
_asm_sync_rebalance	Rebalance uses sync I/O	FALSE
_asm_tcp_user_timeout	TCP_USER_TIMEOUT in minutes	1
_asm_trace_limit_timeout	Time-out in milliseconds to reset the number of traces per disk and the number of processes allowed to trace	30000
_asm_ufg_nw_wait_timeout	seconds to start health check on unresponsive clients	10
_asm_usd_batch	ASM USD Update Max Batch Size	64
_asm_wait_time	Max/imum time to wait before asmb exits	18
_asm_write_badfdata_in_contentcheck	Write BADFDA7A in content check	FALSE
_asm_write_cancel	Write timeout in milliseconds	AUTO
_asm_xrov_nstats	Specify number of IOs before stats	0
_asm_xrov_nvios	Specify number of VIO processes	24
_asm_xrov_rsnmod	Specify ‘reason’ mode	2
_asm_xrov_single	Enable single issues of IOs	FALSE
_asm_zero_power_limit	allow setting zero power limit
_asmsid	ASM instance id	asm
_assert_encrypted_tablespace_blocks	if TRUE, assert encrypted tablespace blocks must be encrypted	TRUE
_assm_default	ASSM default	TRUE
_assm_examination_blocks_threshold	ASSM get space number of fuzzy blocks to examine	8196
_assm_examination_enable_sla	ASSM get space enable examination limits	FALSE
_assm_examination_time_threshold	ASSM get space examination time threshold in seconds	60
_assm_force_fetchmeta	enable metadata block fetching in ASSM segment scan	FALSE
_assm_high_gsp_threshold	Number of blocks rejected before growing segment	11024
_assm_l1cleanout_throttle_time	L1 bitmap block cleanout throttle time in seconds	3
_assm_latency_sampling_frequency	ASSM Latency sampling frequency in seconds	0
_assm_low_gsp_threshold	Number of blocks rejected before collecting stats	10000
_assm_segment_extension_percent	Percent of full blocks after which segment is extended	100
_assm_segment_repair_bg	ASSM Segment repair: bg enable	TRUE
_assm_segment_repair_fg	ASSM Segment repair: fg	0
_assm_segment_repair_maxblks	ASSM Segment repair: Max blocks per slave	4294967294
_assm_segment_repair_timelimit	ASSM Segment repair: Max time in seconds per slave	60
_assm_space_cache_hb_expire	Seconds after which higher order bitmaps expire from space cache	3
_assm_space_cache_max_segments	ASSM Maximum Segments to Track	1024
_assm_test_force_rej	assm min number of blocks to cbk-reject	0
_assm_test_force_rej2	assm min number of blocks to kdt-reject	0
_assm_test_reentrant_gsp	assm test reentrant gsp	FALSE
_async_recovery_claims	if TRUE, issue recovery claims asynchronously	TRUE
_async_recovery_reads	if TRUE, issue recovery reads asynchronously	TRUE
_async_rta_broadcast	asynchronously broadcast RTA boundary	FALSE
_async_scn_sync	Asynchronous SCN Sync Setting	OFF
_async_ts_threshold	check tablespace thresholds asynchronously	1
_atp_block_size_default	ATP setting block size to 8K	TRUE
_auto_assign_cg_for_sessions	auto assign CGs for sessions	FALSE
_auto_bmr	enable/disable Auto BMR	enabled
_auto_bmr_bg_time	Auto BMR Process Run Time	3600
_auto_bmr_fc_time	Auto BMR Flood Control Time	60
_auto_bmr_file_header	Enable Auto BMR for file header fix	TRUE
_auto_bmr_max_rowno	x$krbabrstat Max number of rows	1024
_auto_bmr_noretry_window	Auto BMR NoRetry Window	1800
_auto_bmr_pub_timeout	Auto BMR Publish Timeout	10
_auto_bmr_req_timeout	Auto BMR Requester Timeout	60
_auto_bmr_sess_threshold	Auto BMR Request Session Threshold	30
_auto_bmr_sys_threshold	Auto BMR Request System Threshold	100
_auto_dismount_on_pdb_close	Enable implicit PDB dismount on PDB close	FALSE
_auto_export_preplugin_backup	auto export pre-plugin backup	TRUE
_auto_manage_enable_offline_check	perodically check for OFFLINE disks and attempt to ONLINE	TRUE
_auto_manage_enable_smart_rebalance	OFFLINE instead of DROP disk(s) when free space is not enough for rebalance	TRUE
_auto_manage_exadata_disks	Automate Exadata disk management	TRUE
_auto_manage_infreq_tout	TEST: Set infrequent timeout action to run at this interval, unit is seconds	0
_auto_manage_ioctl_bufsz	oss_ioctl buffer size, to read and respond to cell notifications	8192
_auto_manage_max_online_tries	Max. attempts to auto ONLINE an ASM disk	3
_auto_manage_num_pipe_msgs	Max. number of out-standing msgs in the KXDAM pipe	1000
_auto_manage_num_tries	Num. tries before giving up on a automation operation	2
_auto_manage_online_tries_expire_time	Allow Max. attempts to auto ONLINE an ASM disk after lapsing this time (unit in seconds)	86400
_auto_manage_smart_rebalance_grace_period_in_min	Number of minutes waited after ASM diskgroup free space increases and becomes sufficient for rebalance before dropping an ASM disk offlined due to insufficient free space	0
_auto_manage_smart_rebalance_space_threshold	Percentage of ASM diskgroup free space required for rebalance	0
_auto_rcv_pdb_open	enable automatic recovery during pdb open	1
_auto_rekey_during_mrcv	enable automatic rekey during media recovery	TRUE
_auto_start_pdb_services	Automatically start all PDB services on PDB Open	FALSE
_automatic_maintenance_test	Enable AUTOTASK Test Mode	0
_automemory_broker_interval	memory broker statistics gathering interval for auto memory	3
_autotask_max_window	Maximum Logical Maintenance Window Length in minutes	480
_autotask_min_window	Minimum Maintenance Window Length in minutes	15
_autotask_test_action	test action parameter for AUTOTASK	0
_autotask_test_name	Name of current Autotask Test (or test step)	N/A
_autotbs_management_enabled	allow automatic tablespace management	FALSE
_autotune_gtx_idle_time	idle time to trigger auto-shutdown a gtx background process	600
_autotune_gtx_interval	interval to autotune global transaction background processes	5
_autotune_gtx_threshold	auto-tune threshold for degree of global transaction concurrency	60
_aux_dfc_keep_time	auxiliary datafile copy keep time in minutes	1440
_available_core_count	number of cores for this instance	0
_avoid_scn_growth	enable scn growth optimizations	1
_awr_cdbperf_threshold	Setting for AWR CDBPERF Threshold	21
_awr_corrupt_mode	AWR Corrupt Mode	FALSE
_awr_disabled_flush_tables	Disable flushing of specified AWR tables
_awr_disabled_purge_tables	Disable purging of specified AWR tables
_awr_enable_pdb_snapshots	Enable/Disable AWR PDB level snapshots	TRUE
_awr_flush_threshold_metrics	Enable/Disable Flushing AWR Threshold Metrics	TRUE
_awr_flush_workload_metrics	Enable/Disable Flushing AWR Workload Metrics	FALSE
_awr_incremental_flush_enabled	Enable/Disable AWR automatic incremental flushing	TRUE
_awr_metrics_use_mmnl	Use MMNL or other background process for AWR metrics	FALSE
_awr_mmon_cpuusage	Enable/disable AWR MMON CPU Usage Tracking	TRUE
_awr_mmon_deep_purge_all_expired	Allows deep purge to purge AWR data for all expired snapshots	FALSE
_awr_mmon_deep_purge_extent	Set extent of rows to check each deep purge run	7
_awr_mmon_deep_purge_interval	Set interval for deep purge of AWR contents	7
_awr_mmon_deep_purge_numrows	Set max number of rows per table to delete each deep purge run	5000
_awr_partition_interval	Setting for AWR Partition Interval	0
_awr_pdb_registration_enabled	Parameter to enable/disable AWR PDB Registration	FALSE
_awr_restrict_mode	AWR Restrict Mode	FALSE
_awr_snapshot_level	Set Default AWR snapshot level	BESTFIT
_awr_sql_child_limit	Setting for AWR SQL Child Limit	200
_awr_warehouse_enabled	Enable/Disable AWR warehouse functionality	FALSE
_b_tree_bitmap_plans	enable the use of bitmap plans for tables w. only B-tree indexes	TRUE
_ba_cf_trace_buffer_size	size of per-process I/O KBC trace buffer	131072
_ba_container_filesystem_ausize	allocation unit size for Backup Appliance containers	4194304
_ba_max_containers	maximum number of Backup Appliance containers	0
_ba_max_groups	maximum number of Backup Appliance container groups	0
_ba_max_seg_bytes	maximum number of bytes per array segment	4000
_ba_timeouts_enabled	enable timeouts	TRUE
_background_process_opts	Misc BG procs parameter	0
_backup_align_write_io	align backup write I/Os	TRUE
_backup_appliance_enabled	Backup Appliance Enabled	FALSE
_backup_automatic_retry	automatic retry on backup write errors	10
_backup_block0	backup block0	default
_backup_bool_spare1	backup bool spare1	FALSE
_backup_bool_spare2	backup bool spare2	FALSE
_backup_bool_spare3	backup bool spare3	FALSE
_backup_bool_spare4	backup bool spare4	FALSE
_backup_compress	turn on backup compression always	FALSE
_backup_disk_bufcnt	number of buffers used for DISK channels	0
_backup_disk_bufsz	size of buffers used for DISK channels	0
_backup_disk_io_slaves	BACKUP Disk I/O slaves	0
_backup_dynamic_buffers	dynamically compute backup/restore buffer sizes	TRUE
_backup_encrypt_opt_mode	specifies encryption block optimization mode	4294967294
_backup_file_bufcnt	number of buffers used for file access	0
_backup_file_bufsz	size of buffers used for file access	0
_backup_int_spare1	backup int spare1	4294967294
_backup_int_spare2	backup int spare2	4294967294
_backup_int_spare3	backup int spare3	4294967294
_backup_int_spare4	backup int spare4	4294967294
_backup_io_pool_size	memory to reserve from the large pool	1048576
_backup_kgc_bz2_bufsz	specifies buffer size to be used by BZ2 compression	0
_backup_kgc_bz2_niters	specifies number of iterations done by BZ2 compression	0
_backup_kgc_bz2_type	specifies type used by BZ2 compression	0
_backup_kgc_bzip2_blksiz	specifies buffer size to be used by BZIP2 compression	9
_backup_kgc_lzo_bufsz	specifies buffer size to be used by LZO compression	262144
_backup_kgc_medium_scheme	specifies medium compression scheme	DEFAULT
_backup_kgc_scheme	specifies compression scheme	ZLIB
_backup_kgc_zlib_complevel	specifies compression (performance) level for ZLIB compression	1
_backup_kgc_zlib_memlevel	specifies memory level for ZLIB compression	8
_backup_kgc_zlib_windowbits	specifies window size for ZLIB compression	15
_backup_kgc_zstd_bufsz	specifies buffer size to be used by ZSTD compression	262144
_backup_kgc_zstd_complevel	specifies compression (performance) level for ZSTD compression	3
_backup_ksfq_bufcnt	number of buffers used for backup/restore	0
_backup_ksfq_bufmem_max	maximum amount of memory (in bytes) used for buffers for backup/restore	268435456
_backup_ksfq_bufsz	size of buffers used for backup/restore	0
_backup_max_gap_size	largest gap in an incremental/optimized backup buffer, in bytes	4294967294
_backup_max_wallet_session	specifies maximum wallet session for backup	50
_backup_min_ct_unused_optim	mimimun size in bytes of change tracking to apply unused space optimuzation	2097152
_backup_seq_bufcnt	number of buffers used for non-DISK channels	0
_backup_seq_bufsz	size of buffers used for non-DISK channels	0
_backup_text_spare1	backup text spare1
_backup_text_spare2	backup text spare2
_backup_text_spare3	backup text spare3
_backup_text_spare4	backup text spare4
_bct_bitmaps_per_file	number of bitmaps to store for each datafile	8
_bct_buffer_allocation_max	maximum size of all change tracking buffer allocations, in bytes	104857600
_bct_buffer_allocation_min_extents	mininum number of extents to allocate per buffer allocation	1
_bct_buffer_allocation_size	size of one change tracking buffer allocation, in bytes	2097152
_bct_chunk_size	change tracking datafile chunk size, in bytes	0
_bct_crash_reserve_size	change tracking reserved crash recovery SGA space, in bytes	262144
_bct_file_block_size	block size of change tracking file, in bytes	0
_bct_file_extent_size	extent size of change tracking file, in bytes	0
_bct_fixtab_file	change tracking file for fixed tables
_bct_health_check_interval	CTWR health check interval (seconds), zero to disable	60
_bct_initial_private_dba_buffer_size	initial number of entries in the private change tracking dba buffers	0
_bct_mrp_timeout	CTWR MRP wait timeout (seconds), zero to wait forever	600
_bct_public_dba_buffer_dynresize	allow dynamic resizing of public dba buffers, zero to disable	2
_bct_public_dba_buffer_maxsize	max buffer size permitted for public dba buffers, in bytes	0
_bct_public_dba_buffer_size	total size of all public change tracking dba buffers, in bytes	0
_bequeath_via_broker	Bequeath connections via broker	FALSE
_bg_spawn_diag_opts	background processes spawn diagnostic options	0
_big_scn_test_mode	testing mode for BigSCN	2
_bigdata_external_table	enables use of ORACLE_HIVE and ORACLE_HDFS access drivers	TRUE
_bigram_dependency_percentage	Bigram dependency percentage	5
_bitmap_or_improvement_enabled	controls extensions to partition pruning for general predicates	TRUE
_block_dump_assert	Encrypted block dump assert	FALSE
_block_level_offload_high_lat_thresh	High Latency Threshold for Block Level Offload operations	40000
_block_sample_readahead_prob_threshold	controls readahead value during block sampling	10
_blockhm_flush_period	Block heat map background flush period	3600
_blocking_sess_graph_cache_size	blocking session graph cache size in bytes
_blocks_per_cache_server	number of consecutive blocks per global cache server	16
_bloom_extent_size	bloom filter extent size in bytes	0
_bloom_filter_debug	debug level for bloom filtering	0
_bloom_filter_enabled	enables or disables bloom filter	TRUE
_bloom_filter_ratio	bloom filter filtering ratio	35
_bloom_filter_setops_enabled	Allow bloom filter to be pushed through set operations	TRUE
_bloom_filter_size	bloom filter vector size (in KB)	0
_bloom_folding_density	bloom filter folding density lower bound	16
_bloom_folding_enabled	Enable folding of bloom filter	TRUE
_bloom_folding_min	bloom filter folding size lower bound (in KB)	0
_bloom_max_size	maximum bloom filter size (in KB)	262144
_bloom_max_wait_time	bloom filter wait time upper bound (in ms)	50
_bloom_minmax_enabled	enable or disable bloom min max filtering	TRUE
_bloom_predicate_enabled	enables or disables bloom filter predicate pushdown	TRUE
_bloom_predicate_offload	enables or disables bloom filter predicate offload to cells	TRUE
_bloom_pruning_enabled	Enable partition pruning using bloom filtering	TRUE
_bloom_pruning_setops_enabled	Allow bloom pruning to be pushed through set operations	TRUE
_bloom_pushing_max	bloom filter pushing size upper bound (in KB)	512
_bloom_pushing_total_max	bloom filter combined pushing size upper bound (in KB)	262144
_bloom_rm_filter	remove bloom predicate in favor of zonemap join pruning predicate	FALSE
_bloom_serial_filter	enable serial bloom filter on exadata	ON
_bloom_sm_enabled	enable bloom filter optimization using slave mapping	TRUE
_bloom_use_shared_pool	use shared pool for bloom filter	FALSE
_bloom_wait_on_rac	enables bloom filter (with hash hash distribution) wait on RAC	FALSE
_bps_sanity_checks	enable BPS sanity checks	FALSE
_branch_tagging	enable branch tagging for distributed transaction	TRUE
_broadcast_scn_mode	broadcast-on-commit scn mode	1
_broadcast_scn_wait_timeout	broadcast-on-commit scn wait timeout in centiseconds	10
_bsln_adaptive_thresholds_enabled	Adaptive Thresholds Enabled	TRUE
_bt_mmv_query_rewrite_enabled	allow rewrites with multiple MVs and base tables	TRUE
_buddy_instance	buddy instance control	1
_buddy_instance_num_read_buffers	Num of Read Buffers to scan everytime in Buddy Instance feature	4
_buddy_instance_scan_phase_threshold	Threshold (in secs) to let RMS0 construct the recovery set	3
_buddy_instance_start_rba_timeout	Time-out for re-computing Start RBA in Buddy Instance feature	9
_buffer_busy_wait_timeout	buffer busy wait time in centiseconds	100
_buffered_message_spill_age	Buffered message spill age	300
_buffered_publisher_flow_control_threshold	Flow control threshold for buffered publishers except capture	0
_bufq_stop_flow_control	Stop enforcing flow control for buffered queues	FALSE
_bug29274428_modsvc_call_out_enabled	one-hundred-and-forty-third spare parameter - boolean	FALSE
_build_deferred_mv_skipping_mvlog_update	DEFERRED MV creation skipping MV log setup update	TRUE
_bump_highwater_mark_count	how many blocks should we allocate per free list on advancing HWM	0
_bwr_for_flushed_pi	if TRUE, generate a BWR for a flushed PI	TRUE
_bypass_srl_for_so_eor	bypass SRL for S/O EOR logs	FALSE
_bypass_xplatform_error	bypass datafile header cross-platform-compliance errors	FALSE
_c3_external_scn_rejection_threshold_hours	Lag in hours between max allowed SCN and an external SCN	4464
_cache_fusion_pipelined_updates	Block ping without wait for log force	TRUE
_cache_orl_during_open	cache online logs	ALL
_cache_stats_monitor	if TRUE, enable cache stats monitoring	FALSE
_capability_simulate	Simulate the capabilities for testing
_capture_buffer_size	To set the size of the PGA I/O recording buffers	65536
_capture_pgadep	capture statements at this pgadep	0
_capture_publisher_flow_control_threshold	Flow control threshold for capture publishers	0
_case_sensitive_logon	case sensitive logon enabled	TRUE
_catalog_foreign_restore	catalog foreign file restore	FALSE
_causal_standby_wait_timeout	Causal standby wait timeout	20
_cdb_compatible	CDB Compatible	TRUE
_cdb_cross_container	Debug flag for cross container operations	65535
_cdb_disable_pdb_limit	CDB Compatible	FALSE
_cdb_fleet_sync_timeout	Time in minutes to wait for sync of stub entry in CDB Fleet	10
_cdb_port	Port number for CDB	0
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