内容简介：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：>>
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。
很多特性Oracle并未明确解释何说明，但是我们可以通过参数揣摩端倪。
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。
KSPPINM KSPPSTVL KSPPDESC
-------------------------------------------------- ------------------------- --------------------------------------------------------------------------------
_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
nvironment.
_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:
<n>
-REST:
<m>
")
_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
ry
_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.
</m>
</n>
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：
KSPPINM -------------------------------------------------- _bloom_use_crchash _cdbperf_sweep_enabled _cdt_shared_memory_limit _cdt_shared_memory_query_percent _db_new_lost_write_protect _dbwr_nowrite_tracing_interval _dmm_blas_lib_enable _enable_umf_auto_tasks_pool _gc_cpu_time _gws_chunk_ver _hang_ignore_hngmtrc_count _hcs_no_column_info _imado_histogram_period _imcdt_use_mga _inmemory_ado_enabled _inmemory_batched_flush _inmemory_dynamic_scan_analyze_batch_size _inmemory_periodic_sort _inmemory_segment_populate_verify _kcl_max_reg_sz _key_vector_caching _kqr_allocate_directly_from_sga _kswsas_sim_jp_api _log_event_queues _optimizer_ignore_hints _post_wait_queues_dynamic_queues _px_reuse_server_group _segdict_analyzer_pct _segdict_chain_limit _segdict_check _segdict_chunk_minalloc _segdict_enable _segdict_enable_domaindict _segdict_max_gdsize _segdict_reprobe_limit _segdict_use_ndv _select_any_dictionary_security_enabled _set_mgd_recovery_state _wait_outlier_dlambda _wait_outlier_plambda _wait_outlier_report_minute_interval standby_archive_dest utl_file_dir 43 rows selected. 一点一滴，Oracle 数据库在发生大变化。
历史上的今天...
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