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Oracle 18.3 版本参数比较12.2 看新特性优化诊断增强

在 Oracle Database 18.3 版本发布之后,一系列新的参数被加入到数据库中,这些新的参数就代表了数据库中新增的特性。

以下列表是对比 Oracle Database 12.2 版本,18.3 中新增的参数。通过 x$ksppi 可以看到 12.2 版本有 4846 个参数,而 18.3 有 5159 个参数.
从参数数量上来说,增加了 313 个,这是一个不小的数字,无论是跟踪诊断,性能优化,还是 异常恢复,这些参数都是核心所在。

-------------------------------------------------- ------------------------- --------------------------------------------------------------------------------
_EnableDDLTtriggerTracing			   FALSE		     enable ddl trigger tracing
_EnableShadowTypes				   FALSE		     enable shadow types
_REMOVE_INACTIVE_STANDBY_TDE_MASTER_KEY 	   FALSE		     Remove Inactive Standby TDE Master Key
_REMOVE_STDBY_OLD_KEY_AFTER_CHECKPOINT_SCN	   TRUE 		     Remove standby old key after checkpoint SCN
_STFTranslateDynamicSQL 			   FALSE		     if TRUE translation profile will translate dynamic SQL statements
__memoptimize_xmem_pool_size_metadata		   0			     Size of extended cache metadata of MEMOPTIMIZE buffer pool for standard block si
									     ze buffers

__sga_current_size				   0			     Current size for PDB SGA
_adg_auto_close_pdb				   TRUE 		     ADG recovery auto close PDB upon PDB drop/unplug/rename marker
_adg_objectlock_attempts			   2			     Maximum attemps for objectlock get on ADG
_adg_objectlock_maxnum				   1000 		     The maximum limit of the objectlock number on ADG
_adg_objectlock_timeout 			   0			     timeout for objectlock get on ADG in centiseconds
_adg_redirect_flags				   0			     Flags for controlling ADG's Statement Redirection behavior
_allocate_flashback_buffer			   FALSE		     Allocate flashback buffer at mount time even if flashback is off
_allow_cross_endian_dictionary			   FALSE		     Allow cross-endian data dictionary
_app_container_debug				   0			     Enable Debug tracing in Application container
_apppdb_multi_slave_sync			   TRUE 		     Multiple slaves used during Application sync
_aq_dqblocks_in_cache				   0			     deq blocks in cache
_aq_free_list_pools				   10			     state object and transaction memory pools
_aq_lb_garbage_col_interval			   600			     AQ LB garbage collect interval
_aq_lb_subht_bkt_ltch				   32			     AQ LB subscriber ht bucket latches
_aq_lb_subht_elm_ltch				   128			     AQ LB subscriber ht element latches
_aq_max_pdb_close_msg				   1			     Max Number of AQ Recovery Messages when pdb is closed
_aq_scrambled_deqlog				   1			     scrambled deqlog
_asm_allow_dgname_special_chars 		   FALSE		     Enable the use of special characters in diskgroup names
_asm_async_scrub_reap_wait			   100000		     Async scrubbing reaping IO wait in microseconds
_asm_cancel_delta				   75000		     Delta timeout for blocking big writes in milliseconds
_asm_enable_batch_scrub 			   FALSE		     Allow scrubbing verification to run in batch mode
_asm_enable_kfios				   FALSE		     Enable KFIOS module
_asm_oda_type								     ODA Type
_asm_proxy_online_restart			   0			     Allow patching while ADVM volumes are online
_asm_pstonpartners				   TRUE 		     Select ideal PST disks following partnership
_asm_reloc_cic					   FALSE		     Allow relocation during rolling migration
_asm_relocation_scheme				   alloc_p2 alloc_s3 reb_p2  ASM allocation / relocation scheme
						   reb_s1 bal_p2 bal_s3 prep
						   _p2 prep_s3

_asm_write_badfdata_in_contentcheck		   TRUE 		     Write BADFDA7A in content check
_asm_zero_power_limit							     allow setting zero power limit
_async_scn_sync 				   OFF			     Asynchronous SCN Sync Setting
_auto_dismount_on_pdb_close			   FALSE		     Enable implicit PDB dismount on PDB close
_auto_rcv_pdb_open				   1			     enable automatic recovery during pdb open
_awr_incremental_flush_enabled			   TRUE 		     Enable/Disable AWR automatic incremental flushing
_backup_block0					   default		     backup block0
_bequeath_via_broker				   FALSE		     Bequeath connections via broker
_bloom_extent_size				   0			     bloom filter extent size in bytes
_bloom_filter_setops_enabled			   TRUE 		     Allow bloom filter to be pushed through set operations
_bloom_max_wait_time				   50			     bloom filter wait time upper bound (in ms)
_bloom_pruning_setops_enabled			   TRUE 		     Allow bloom pruning to be pushed through set operations
_bloom_use_shared_pool				   FALSE		     use shared pool for bloom filter
_bloom_wait_on_rac				   FALSE		     enables bloom filter (with hash hash distribution) wait on RAC
_capability_simulate							     Simulate the capabilities for testing
_cdb_fleet_sync_timeout 			   10			     Time in minutes to wait for sync of stub entry in CDB Fleet
_cdb_port					   0			     Port number for CDB
_cdb_view_no_skip_restricted			   FALSE		     do not skip RESTRICTED mode PDBs from results of CONTAINERS()
_cell_offload_hybrid_processing 		   TRUE 		     enable hybrid SQL processing offload to cells
_cell_offload_vector_groupby_force		   FALSE		     force offload of vector group by
_cgs_publish_netinfo_collect_event_chm		   TRUE 		     enable cgs publish collect_netinfo event to event stream for CHM
_cgs_publish_netinfo_collect_event_haip 	   FALSE		     enable cgs publish collect_netinfo event to event stream for HAIP
_clear_preserved_buffers			   TRUE 		     Clear preserved buffers before DB reopen after switchover
_client_result_cache_ramthreshold					     client_result_cache_ramthreshold
_cloud_service_sim				   0			     simulate cloud services in Database
_cloud_service_type							     cloud service type
_con_map_sql_enforcement			   TRUE 		     disable container map SQL enforcement
_connection_broker_handout_accept		   FALSE		     connection broker accepts prior to handout
_cross_con_collection				   FALSE		     enable cross container collection
_datapump_gather_stats_on_load			   FALSE		     Gather table statistics during Data Pump load rather thanimporting statistics fr
									     om the dump file. This should be set to TRUE in the lockdown profile in a DWCS e

_datapump_inherit_svcname			   FALSE		     Inherit and propagate service name throughout job
_db_flash_cache_slow_io_adjustment_interval	   3600 		     Decrement interval
_db_imoltp_hashidx_force_nonctg 		   0			     kcbw imoltp hash index force non contig granules
_db_shadow_lost_write_protect			   NOT_SET		     alter shadow lost write detection for PDB
_disable_actualization_for_grant		   FALSE		     disable actualization of editioned objects on grant
_disable_asm_audit_feat 			   0			     disable ASM audit features
_disable_dblink_optim				   TRUE 		     disable intra CDB dblink optimizations
_disable_system_tablespaces_enc_enforcement	   FALSE		     if TRUE, disable system tablespaces encryption enforcement
_dmm_pga_load_threshold 			   3			     Model size less than threshold are loaded into PGA
_drain_on_ping_database 			   TRUE 		     Should session drain be performed when user issues OPING
_dskm_single_instance				   FALSE		     DSKM and Diskmon operating in Single Instance mode
_dss_cache_flush_threshold			   1			     threshold when thread ckpt considered over obj ckpt
_duplicated_table_complete_refresh_percent	   50			     percent threshold for duplicated table to do complete refresh
_dupt_noupdate					   0			     disable duplicated table updates
_ena_storage_lmt				   DEFAULT		     Enable storage clause for LMT
_enable_auto_upgrade				   FALSE		     Enable automatic PDB upgrade
_enable_dbwr_auto_tracing			   0			     enable dbwriter auto-tracing
_enable_imc_mira				   FALSE		     enable IMC with  multi instance redo apply
_enable_ios_spm 				   FALSE		     Allow Split Mirror operations via IOServer
_enable_multiple_fgprepares			   FALSE		     Allow concurrent PREPAREs on the same database
_enable_parallel_dml				   FALSE		     enables or disables parallel dml
_enable_pmo_outside_begin_end			   TRUE 		     Enable PMO outside begin-end block
_enable_proxy_adg_redirect			   FALSE		     Enable Statement Redirection Support for ADG using Proxy PDB
_enable_single_dgprepare			   FALSE		     Disable concurrent PREPAREs in same disk group
_error_row_predicate_evaluation 		   AUTO 		     skip predicate evaluation for error rows
_exadata_feature_on				   FALSE		     Exadata Feature On
_fg_fast_sync_sleep_usecs			   50			     DAX log file sync sleep time
_fg_fast_sync_spin_usecs			   300			     DAX log file sync spins time
_force_active_temp_detection			   FALSE		     Force active temp detection during PDB close
_freeze_kgh_timestamp				   FALSE		     prevent heap manager timestamp from advancing
_gc_lease_time					   500			     lease time for rdma reads
_gc_max_reg_sz					   68719476736		     maximum length for memory registration
_gc_partial_cleanout				   FALSE		     if TRUE, partial cleanout is enabled
_gc_undo_rdma_read				   FALSE		     if TRUE, rdma read of undo blocks is enabled
_gcs_disable_imc_preallocation			   FALSE		     disable preallocation for imc memory requirement in RAC
_gcs_enable_private_iterator			   TRUE 		     Enable private iterator for GCS locks
_gcs_recoverable_asserts			   1			     if non-zero, enable recoverable assert resolution
_gdr_control_flags				   0			     gdr control flags
_gds_allow_nullkey				   0			     allow the use of nullable shard key columns
_gds_max_chunk_num				   0			     max chunk_num used in sharding environment
_ges_mseq_demo					   0			     demo mseq wrap scenarios (dflt is 0)
_globaldict_analyzer_pct			   100			     Maximum percentage of unique values in analyzer phase for GD
_globaldict_chain_limit 			   32			     Chain limit for global dictionary
_globaldict_check				   0			     Dictionary checking
_globaldict_chunk_minalloc			   FALSE		     Force minimum chunk allocation size
_globaldict_dbg 				   0			     Global dictionary debug modes
_globaldict_enable				   2			     Enable segment dictionary
_globaldict_max_gdsize				   1073741824		     Maximum number of entries in a Global dictionary
_globaldict_reprobe_limit			   1			     Reprobe limit for global dictionary
_globaldict_use_ndv				   TRUE 		     Use NDV for sizing global dictionary, if available
_gwm_db_unique_name							     gsm db_unique_name name
_hang_appl_issue_session_threshold		   0			     Hang Management application issue session threshold
_hang_asm_hang_resolution_enabled		   FALSE		     Hang Management ASM hang resolution enabled
_hang_deadlock_resolution_enabled		   TRUE 		     Hang Management deadlock resolution enabled
_hang_hang_blocked_session_delta_percent_threshold 20			     Hang Manager hang's blocked session delta percent threshold
_hang_ignore_hngmtrc_interval			   150			     Hang Management ignore hang metric dependent hang interval
_hang_intersecting_chains_scanning_enabled	   TRUE 		     Hang Management intersecting chains scanning is allowed
_hang_log_important_hangs_to_alert		   TRUE 		     Hang Management log important hangs to alert log
_hang_promote_process_termination_interval	   70			     Hang Management promote process termination interval in seconds
_hang_root_ha_phase_trigger_time		   300			     Hang Management root HA phase trigger time
_hcs_expose_with_expr				   FALSE		     expose internal with_expression
_hcs_gen_aggr_opt_estimate			   FALSE		     apply OPT_ESTIMATE hint to aggregation queries
_hcs_ignore_latest_compat_check 		   FALSE		     skip compatibility check for latest compatible version
_hcs_in_mem_cdt_hint				   FALSE		     add hint opt_param('_in_memory_cdt', 'off')
_hcs_mdx_cache_name_col 			   FALSE		     add column for mdx cache name
_hcs_mdx_cache_name_no_sid			   FALSE		     don't use session id in mdx cache hint names
_hcs_mdx_sleep_after_pin			   FALSE		     sleep after pinning MDX caches
_hcs_no_calc_dtm_to_out_opt			   FALSE		     apply move calc determined hier to output hier optimization
_hcs_no_cell_qry_atr_prune_opt			   FALSE		     apply attribute prune optimization to cell query
_hcs_no_cell_qry_lvl_prune_opt			   FALSE		     apply level prune optimization to cell query
_hcs_no_cell_qry_meas_prune_opt 		   FALSE		     apply measure prune optimization to cell query
_hcs_no_cell_qry_mv_cache_opt			   FALSE		     apply mv cache optimization to cell query
_hcs_no_cell_qry_no_calc_nav_opt		   FALSE		     apply no calc navigation optimization to cell query
_hcs_no_cell_qry_no_out_data_opt		   FALSE		     apply no output data optimization to cell query
_hcs_no_cell_qry_tmpls				   FALSE		     no cell query templates for optimization
_hcs_no_col_prune_optz				   FALSE		     skip column pruning optimization on generated SQL
_hcs_no_fltr_fact_opt				   FALSE		     apply filtered fact optimization
_hcs_no_fltr_hier_star_opt			   FALSE		     apply filtered hierarchy star optimization
_hcs_no_inline_tmpl_opt 			   FALSE		     apply inline single ref top blocks optimization to cell query
_hcs_no_jback_opt_for_hord_in_oby		   FALSE		     optimize analytic view joinback for HIER_ORDER
_hcs_no_mdx_cache_hint				   FALSE		     generate hcs query mdx cache hints
_hcs_no_mv_rewrite_check			   FALSE		     skip MV rewrite check when generating for ANALYTIC VIEW cache
_hcs_no_opt_cell_qry				   FALSE		     optimize cell query
_hcs_no_rm_like_withs_optz			   FALSE		     skip like WITH element removal optimization on generated SQL
_hcs_no_rm_unused_withs_optz			   FALSE		     skip unused WITH element removal optimization on generated SQL
_hcs_no_rmv_unref_top_opt			   FALSE		     apply remove unref top blocks optimization to cell query
_hcs_no_tgt_depths_opt				   FALSE		     apply target depths optimization
_hcs_opt_av_pred_push				   TRUE 		     enable optimizer AV predicate pushing via reparse
_hcs_parse_dynamic_all_cache			   FALSE		     allow parsing of dynamic across all levels cache
_hcs_stats_max_card				   2000000		     maximum value for stats cardinality
_hcs_use_dynamic_all_cache			   FALSE		     use dynamic across all levels cache
_hcs_use_multi_parent_gen			   FALSE		     generate hcs query using multi-parent aggregation
_hugetlbfs_mount_point_for_sga						     HugeTLBFS mount point to be used
_imado_diagtasks_log_period			   5			     IM-ADO diagnostic tasks logging period (in seconds)
_imado_diagtasks_purge_period			   30			     IM diagnostic tasks purge older than X days
_imado_evict_sf 				   2			     AIM evict safety factor
_imado_sysaux_usage_limit			   90			     SYSAUX usage percent limit for storing AIM diagnostics
_imtxnrma_table_enable				   FALSE		     is In-Memory RMA Txn Table cache enabled
_index_load_analysis_frequency			   4			     index load compression analysis frequency
_inmemory_adg_batched_flush			   TRUE 		     If true, batched flush is performed
_inmemory_adg_journal_quota			   FALSE		     If true, throttled mining is performed under space pressure
_inmemory_adg_parallel_flush			   TRUE 		     If true, parallel flush is performed
_inmemory_adg_periodic_sort			   FALSE		     If true, periodic sort is performed
_inmemory_delta_population			   0			     Control Delta IMCU population
_inmemory_dynamic_scans_analyze_batch_size	   5			     Inmemory dynamic scan analyze batch size
_inmemory_external_table			   TRUE 		     Enable inmemory extern table
_inmemory_grpcolinv_buffer_size 		   131072		     In-memory grpcolinv buffer size
_inmemory_grpcolinv_granularity 		   1			     In-memory grpcolinv blks per colmap
_inmemory_hwm_expand_percent			   20			     max blks percent can exceed in hwmimcu
_inmemory_hwm_expansion 			   0			     If 0, the highwatermark CU is dropped when expanded
_inmemory_max_delta				   5			     Inmemory max number of deltas per CU
_inmemory_min_delta_blocks			   50			     Inmemory minimum blocks per delta
_inmemory_min_delta_rows			   255			     Inmemory minimum rows per delta
_inmemory_patch_background_blocks		   200			     In-memory SMU patch threshold blocks to start background tasks
_inmemory_patch_commit_path			   FALSE		     If true, enable the SMU patching from DML path
_inmemory_patch_threshold_blocks		   25			     In-memory SMU patch threshold blocks
_inmemory_prefix_encode_dsbs			   FALSE		     Prefix-encode the DSB-dictionary
_inmemory_scan_invalid_percent			   30			     Inmemory scan invalid percentage
_inmemory_smu_patch_options			   7			     Inmemory SMU patching options
_inmemory_vector_encode_override		   FALSE		     Populate and use DSBs for Vector Encode columns
_instance_recovery_bloom_filter_fprate		   0			     Allowable false positive percentage [0-100]
_instance_recovery_bloom_filter_size		   83886080		     Bloom filter size (in num of bits) used during claim phase
_intra_cdb_dblink				   FALSE		     enable intra CDB implicit dblink
_kcfis_pmem_enabled				   FALSE		     RDMA Persistent Memory support enabled
_kdfip_buf_nclatch				   64			     memopt w buffer child latches
_kdfip_bufl_nbkt				   64			     memopt w buffers list buckets
_kdfip_cmap_nbkt				   16			     memopt w chunk map buckets
_kdfip_debug					   0			     memopt w debug
_kdfip_drain_sleeps				   60			     memopt w drain coord sleep count
_kdfip_elem_nclatch				   64			     memopt w chunkmap elem child latches
_kdfip_flush_nrows				   10			     memopt w flush num rows
_kdfip_flush_rowsz				   1024 		     memopt w flush row size
_kdfip_flush_rowtm				   60			     memopt w flush time
_kdfip_iga_bufsz				   65536		     memopt w write buffer size
_kdfip_iga_maxsz				   52428800		     memopt w max global area size
_kdfip_par_flush				   TRUE 		     memopt w parallel flush
_kdfip_trace					   FALSE		     memopt w tracing on-off
_kdkv_fg_drop_memopt				   TRUE 		     hashindex foreground drop
_kdkv_fg_no_memopt				   FALSE		     hashindex foreground cleanup
_kdkv_fg_populate				   FALSE		     hashindex foreground populate
_kdkv_fg_repopulate				   FALSE		     hashindex foreground repopulate
_kdkv_force_fastpath				   FALSE		     kdkv fast path on-off
_kdkv_index_lossy				   TRUE 		     hashindex lossiness on-off
_kdkv_index_relocate				   FALSE		     hashindex relocation on-off
_kdkv_indexinvalid				   FALSE		     objd and rdba based index invalidation
_kdkv_trace					   FALSE		     kdkv tracing on-off
_kdlxp_no_dedup_on_insert			   FALSE		     disable deduplication for new inserts of deduplicated lobs
_key_vector_double_enabled			   TRUE 		     enables or disables key vector support for binary_double
_key_vector_shared_dgk_ht			   TRUE 		     allows shared DGK hash table
_key_vector_timestamp_enabled			   TRUE 		     enables or disables key vector support for timestamp
_kra_cfile_compaction				   TRUE 		     controlfile record compation
_kse_alt_stack_sig_syms 			   10			     The number of top symbols used for the alternate stack signature
_ksipc_trace_bucket				   PRIVATE		     memory tracing: use ksipc-private or rdbms-shared bucket
_ksipc_trace_bucket_size			   IPC0:1048576-REST:8192    KSIPC trace bucket size in bytes (format: "IPC0:-REST:")
_ksipc_window_size							     Configure IPC Windowing Value for clients on a per transport basis
_ksipcsnsrv								     Configure Shared Nothing Server Name
_ksm_sp_rcr_hits				   10			     hits to make object recurrent
_ksmd_trace					   0			     ksmd tracing
_ksmsq_hintmaxinst				   1024 		     KSMSQ Hint Max Instances
_ksmsq_hintmaxproc				   300			     KSMSQ Hint Max Processes
_ksws_java_patching				   0			     java patching mode
_kswsas_drain_kill_batch_size			   5			     Batch size for killing non-drained sessions
_kswsas_num_jp_slaves							     Number of slaves for java patching
_ksxp_validate_cnh_life_cycle			   0			     enable validation of ksxp connection life cycle
_ktst_tscleanup_timeout 			   1800 		     Time in seconds to wait for active temp clients
_ldap_config_force_sync_up			   FALSE		     LDAP configure force sync up
_ldap_config_ssl_for_sasl_md5			   TRUE 		     LDAP configure SSL for SASL-DIGEST-MD5
_ldap_reset_user_account_flc			   TRUE 		     LDAP reset user account lockout counter
_lm_chk_inv_domenq_ops				   TRUE 		     enable checks for invalid enqueue operations on domains
_lm_comm_slow_op_loop_threshold 		   15			     GES communication slow operation loop threshold in ms
_lm_enq_iso_enabled				   TRUE 		     if TRUE enables enqueue isolation
_lm_idle_connection_action			   kill 		     GES idle connection action
_lm_idle_connection_load_check			   TRUE 		     GES idle connection load check
_lm_nonisolated_restype 			   TOTTUL		     string of resource types banned from enqueue isolation
_lm_pdb_wait_all_gone				   FALSE		     pdb domain attach wait until all locks are gone
_lm_recovery_set				   1			     enable recovery set checking for accessing invalid domains
_lm_share_lock_pdbisolation			   TRUE 		     if TRUE enables share lock optimization with pdb isolation
_lm_use_us_timer				   FALSE		     Use microsecond timer for LM hist
_lm_wait_for_hub_rcv_timeout			   300000		     read-only insts wait for hub avaliable to recover in millis
_lmhb_procstate_dump_cputime_limit		   60			     hb diagnostic cputime limit for process state dump in secs
_lmhb_procstate_dump_runtime_limit		   60			     hb diagnostic runtime limit for process state dump in secs
_lob_use_locator_varying_width			   FALSE		     use varying width flag in lob locator
_max_lwt_cpu_ratio				   2			     ratio to determine the maximum CPUs for LWTs
_memoptimize_xmem_pool_size			   0			     Size of MEMOPTIMIZE buffer pool for standard block size buffers on extended memo

_memory_adi_module_mask 			   0			     bit mask of modules to enable ADI versioning
_mga_large_page_path							     large page path
_next_pdbid					   3			     Hint for the next PDBID to use when creating a new PDB entry
_no_catalog								     options whose schemas should not be created
_no_snapshot_root_clone 			   FALSE		     No snapshot clone during Application Root Clone creation
_nologging_apply_stall_time			   1000 		     milli-seconds recovery waits after DTC full before changing RCVID
_nologging_fetch_initial_interval		   2			     seconds recovery waits between issuing fetches for old ranges
_nologging_mode_override			   0			     Override the database logging mode; 1=Force, 2=NoForce, 3=LP, 4=DA
_nologging_progress_keep_alive			   10			     Nologging standby progress keep alive time
_nologging_slots				   20			     Nologging standby: initial buffer count
_nologging_standby_cold_buffer_timeout		   500			     Centi-seconds recovery will wait for a buffer that is not being sent by a direct
									      load client in Nologging Standby Data Availability mode

_nologging_standby_dtc_expire			   600			     The number of seconds a Data Transfer Cache buffer may remain unclaimed
_nologging_standby_fetch_disable		   FALSE		     controls whether invalid block ranges are fecthed during recovery
_nologging_standby_hot_buffer_timeout		   500			     Centi-seconds recovery will wait for a buffer being sent by a direct load client
									      in Nologging Standby Data Availabilty mode

_nologging_standby_refetch_disable		   FALSE		     controls fetching of pre-existing invalid block ranges during standby recovery
_optimizer_allow_all_access_paths		   TRUE 		     allow all access paths
_optimizer_answering_query_using_stats		   FALSE		     enable statistics-based query transformation
_optimizer_gather_stats_on_load_all		   FALSE		     enable/disable online statistics gathering for nonempty segments
_optimizer_gather_stats_on_load_hist		   FALSE		     enable/disable online histogram gathering for loads
_optimizer_key_vector_payload			   TRUE 		     enables or disables dimension payloads in vector transform
_optimizer_vector_fact_payload_ratio		   20			     cost based vector transform payload dimension to fact ratio
_parallel_lmd_reconfig				   1			     parallel lmd work in reconfiguration for enqueues.
_partition_by_con_name				   FALSE		     enable partitioning by con$name
_pdb_ignore_table_clauses			   TRUE 		     Ignore subset of clauses in CREATE TABLE and ALTER TABLE
_pdb_isolation_class				   NONE 		     PDB isolation level: NONE, HIGH or MAX
_pdb_ldp_cascade				   0			     pluggable database lockdown profile cascade param
_pga_limit_per_process_minimum			   3145728		     pga_aggregate_limit per-process minimum
_pmon_exitnfy_enabled				   FALSE		     PMON Exit notification enabled
_ptf_enable_objects				   FALSE		     enable object types in PTF
_ptf_max_rows					   1024 		     number of rows per row-buffer
_ptt_max_num					   16			     Maximum number of PTTs per session
_px_granule_alignment				   1024 		     default size of a rowid range granule (in KB)
_px_join_skew_null_handling			   TRUE 		     enables null skew handling improvement for parallel outer joins
_px_join_skew_sampling_percent			   0			     Sets sampling percentage for skew handling sampling queries
_px_join_skew_sampling_time_limit		   50			     Sets execution time limit for skew handling sampling queries
_px_join_skew_use_histogram			   TRUE 		     Enables retrieval of skewed values from histogram when possible
_px_nlj_bcast_rr_threshold			   10			     threshold to use broadcast left random right distribution for NLJ
_px_partition_skew_threshold			   80			     percentage of table size considered as threshold for skew determination
_px_pwise_wif_enabled				   TRUE 		     enable parallel partition wise window function
_px_reuse_server_groups 			   MULTI		     enable/disable reusing of server groups that are already acquired
_px_shared_hash_join				   FALSE		     enable/disable shared hash join
_px_tq_memcpy_threshold 			   100			     threshold for PQ TQ to use memcpy for packing columns
_qksfgi_dynamic_partitions						     enable partition bind SQLIDs for
_qksfgi_feature_level				   0			     controls the feature level for fine-grained cursor invalidation
_rac_propagate_last_rba 			   TRUE 		     Propagate last written log redo address in RAC for log mining
_read_only_slave_timeout			   30			     Time to wait on read only node when hub not available
_read_optimized_table_lookup			   TRUE 		     enables read-optimized table lookup
_reader_farm_isolation_enable			   FALSE		     Reader Farm instances isolation enable
_reader_farm_isolation_time_threshold		   200			     reader farm isolation time threshold
_record_module_name				   TRUE 		     Record module name in BEGIN action
_redo_log_key_reuse_count			   0			     Determines the number of redo logs sharing the same redo log key
_redo_write_sync_single_io			   TRUE 		     enable sync I/O for single redo write
_ref_cons_sql_enforcement			   TRUE 		     disable extended/data ref constraint SQL enforcement
_reg_cache_status				   FALSE		     Enables or disabled caching
_remessage_dbwrs				   0			     DBWR wait and remessage time - in cs
_request_boundaries				   1			     request boundaries mode
_restore_block0 				   on			     restore block0
_result_cache_per_pdb				   TRUE 		     Is service result cache per pdb
_rm_exadata_partition_fc			   FALSE		     Partition flash cache for Exadata
_rm_exadata_pdb_cpu_cnt_mult			   2			     Multiplication factor for PDB cpu count
_rmv_dynamic_priority				   TRUE 		     enable rmv priority modification
_root_clone_state_from_root			   TRUE 		     Application Root Clone's state comes from Application Root
_sequence_scale_extend				   FALSE		     Force sequence creation with scale extend
_sequence_scale_noextend			   FALSE		     Force sequence creation with scale noextend
_shd_atomic_move				   0			     Use atomic move
_show_login_pdb_sessions			   FALSE		     return logon pdb container id from v$session
_simulate_dax_storage				   DISABLE		     Simulate log on DAX storage
_skip_pdb_recovery_if_keystore_not_open 	   FALSE		     Skip PDB recovery when the PDB's keystore is not open
_skip_unconverted_change_vector 		   FALSE		     Skip apply of a CV that has no endian conversion function
_slow_kill_on_pdb_close_immediate		   FALSE		     Kill sessions periodically on pdb close immediate
_sqlexec_cache_aware_hash_aggr_enabled		   TRUE 		     enable/disable cache aware hash aggregation
_sqlexec_pwiseops_with_binds_enabled		   TRUE 		     enable partition wise execution in the presence of bind variables in inlist equa
									     lity operator in where clause

_sqlexec_pwiseops_with_sqlfuncs_enabled 	   TRUE 		     enables partition wise operations even in the presence of functions over table p
									     artition keys

_sqlexec_reorder_wif_enabled			   TRUE 		     enable re-ordering of window functions
_sqlexec_use_kgghash3				   TRUE 		     use CRC-based hash function
_standby_newkey_keystore_location					     Location of keystore on standby having new key
_uniq_cons_sql_enforcement			   TRUE 		     disable extended data unique constraint SQL enforcement
_use_fallocate_for_mga				   FALSE		     MGA fallocate enabled
_use_hugetlbfs_for_SGA				   FALSE		     Enable HugeTLBFS usage for SGA
_use_large_pages_for_mga			   FALSE		     MGA largepage enabled
_verify_encrypted_tablespace_keys		   TRUE 		     if TRUE, verify encryption key signature for data files
_wait_outlier_dump_flags			   0			     Wait Outlier Dump Flags
_wait_outlier_lambda_x1000			   1500 		     Lambda (in thousands) to compute outliers
_wait_outlier_min_waits 			   10			     Minimum waits required to enable wait outliers detection
_wait_outlier_num_outliers			   600			     Max number of outliers tracked
_xt_def_compression_ratio			   4			     Default compression ratio for external table data files
_xt_http_wscl					   FALSE		     Use KGWSCL for HTTP requests
_xt_legacy_debug_flags				   0			     Debug flags for ORACLE_LOADER and ORACLE_DATAPUMP
adg_account_info_tracking			   LOCAL		     ADG user account info tracked in standby(LOCAL) or in Primary(GLOBAL)
awr_pdb_max_parallel_slaves			   10			     maximum concurrent AWR PDB MMON slaves per instance
forward_listener							     forward listener
inmemory_automatic_level			   OFF			     Enable Automatic In-Memory management
inmemory_optimized_arithmetic			   DISABLE		     Controls whether or not DSBs are stored in-memory
inmemory_prefer_xmem_memcompress					     Prefer to store tables with given memcompress levels in xmem
inmemory_prefer_xmem_priority						     Prefer to store tables with given priority levels in xmem
inmemory_xmem_size				   0			     size in bytes of in-memory xmem area
memoptimize_pool_size				   0			     Size of cache for imoltp buffers
multishard_query_data_consistency		   strong		     consistency setting for multishard queries
multishard_query_partial_results		   not allowed		     enable partial results for multishard queries
optimizer_ignore_hints				   FALSE		     enables the embedded hints to be ignored
optimizer_ignore_parallel_hints 		   FALSE		     enables embedded parallel hints to be ignored
parallel_min_degree				   1			     controls the minimum DOP computed by Auto DOP
pdb_template								     PDB template
private_temp_table_prefix			   ORA$PTT_		     Private temporary table prefix
standby_pdb_source_file_dblink						     database link to standby source files
standby_pdb_source_file_directory					     standby source file directory location
tde_configuration							     Per-PDB configuration for Transparent Data Encryption
unified_audit_systemlog 						     Syslog facility and level for Unified Audit
wallet_root								     wallet root instance initialization parameter

356 rows selected.

废弃的参数,在12.2 中存在,可是在 18.3 中已经被驱逐的废弃参数,数量是 43 个,参考如下列表:


43 rows selected.

一点一滴,Oracle 数据库在发生大变化。

    >> 2011-08-01文章:
    >> 2007-08-01文章:
           上海OOW上偶遇Rich Niemiec
    >> 2006-08-01文章:
    >> 2005-08-01文章:

By eygle on 2018-08-01 19:20 | Comments (0) | Oracle12c/11g | 3295 |

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