PostgreSQL 参数列表





postgres=# SHOW all;
                  name                  |                       setting                       |                                                          description
----------------------------------------+-----------------------------------------------------+-------------------------------------------------------------------------------------------------------------------------------
 allow_system_table_mods                | off                                                 | Allows modifications of the structure of system tables.
 application_name                       | psql                                                | Sets the application name to be reported in statistics and logs.
 archive_cleanup_command                |                                                     | Sets the shell command that will be executed at every restart point.
 archive_command                        | (disabled)                                          | Sets the shell command that will be called to archive a WAL file.
 archive_mode                           | off                                                 | Allows archiving of WAL files using archive_command.
 archive_timeout                        | 0                                                   | Forces a switch to the next WAL file if a new file has not been started within N seconds.
 array_nulls                            | on                                                  | Enable input of NULL elements in arrays.
 authentication_timeout                 | 1min                                                | Sets the maximum allowed time to complete client authentication.
 autovacuum                             | on                                                  | Starts the autovacuum subprocess.
 autovacuum_analyze_scale_factor        | 0.1                                                 | Number of tuple inserts, updates, or deletes prior to analyze as a fraction of reltuples.
 autovacuum_analyze_threshold           | 50                                                  | Minimum number of tuple inserts, updates, or deletes prior to analyze.
 autovacuum_freeze_max_age              | 200000000                                           | Age at which to autovacuum a table to prevent transaction ID wraparound.
 autovacuum_max_workers                 | 3                                                   | Sets the maximum number of simultaneously running autovacuum worker processes.
 autovacuum_multixact_freeze_max_age    | 400000000                                           | Multixact age at which to autovacuum a table to prevent multixact wraparound.
 autovacuum_naptime                     | 1min                                                | Time to sleep between autovacuum runs.
 autovacuum_vacuum_cost_delay           | 2ms                                                 | Vacuum cost delay in milliseconds, for autovacuum.
 autovacuum_vacuum_cost_limit           | -1                                                  | Vacuum cost amount available before napping, for autovacuum.
 autovacuum_vacuum_scale_factor         | 0.2                                                 | Number of tuple updates or deletes prior to vacuum as a fraction of reltuples.
 autovacuum_vacuum_threshold            | 50                                                  | Minimum number of tuple updates or deletes prior to vacuum.
 autovacuum_work_mem                    | -1                                                  | Sets the maximum memory to be used by each autovacuum worker process.
 backend_flush_after                    | 0                                                   | Number of pages after which previously performed writes are flushed to disk.
 backslash_quote                        | safe_encoding                                       | Sets whether "\'" is allowed in string literals.
 bgwriter_delay                         | 200ms                                               | Background writer sleep time between rounds.
 bgwriter_flush_after                   | 0                                                   | Number of pages after which previously performed writes are flushed to disk.
 bgwriter_lru_maxpages                  | 100                                                 | Background writer maximum number of LRU pages to flush per round.
 bgwriter_lru_multiplier                | 2                                                   | Multiple of the average buffer usage to free per round.
 block_size                             | 8192                                                | Shows the size of a disk block.
 bonjour                                | off                                                 | Enables advertising the server via Bonjour.
 bonjour_name                           |                                                     | Sets the Bonjour service name.
 bytea_output                           | hex                                                 | Sets the output format for bytea.
 check_function_bodies                  | on                                                  | Check function bodies during CREATE FUNCTION.
 checkpoint_completion_target           | 0.5                                                 | Time spent flushing dirty buffers during checkpoint, as fraction of checkpoint interval.
 checkpoint_flush_after                 | 0                                                   | Number of pages after which previously performed writes are flushed to disk.
 checkpoint_timeout                     | 5min                                                | Sets the maximum time between automatic WAL checkpoints.
 checkpoint_warning                     | 30s                                                 | Enables warnings if checkpoint segments are filled more frequently than this.
 client_encoding                        | GBK                                                 | Sets the client's character set encoding.
 client_min_messages                    | notice                                              | Sets the message levels that are sent to the client.
 cluster_name                           |                                                     | Sets the name of the cluster, which is included in the process title.
 commit_delay                           | 0                                                   | Sets the delay in microseconds between transaction commit and flushing WAL to disk.
 commit_siblings                        | 5                                                   | Sets the minimum concurrent open transactions before performing commit_delay.
 config_file                            | S:/Program Files/PostgreSQL/12/data/postgresql.conf | Sets the server's main configuration file.
 constraint_exclusion                   | partition                                           | Enables the planner to use constraints to optimize queries.
 cpu_index_tuple_cost                   | 0.005                                               | Sets the planner's estimate of the cost of processing each index entry during an index scan.
 cpu_operator_cost                      | 0.0025                                              | Sets the planner's estimate of the cost of processing each operator or function call.
 cpu_tuple_cost                         | 0.01                                                | Sets the planner's estimate of the cost of processing each tuple (row).
 cursor_tuple_fraction                  | 0.1                                                 | Sets the planner's estimate of the fraction of a cursor's rows that will be retrieved.
 data_checksums                         | off                                                 | Shows whether data checksums are turned on for this cluster.
 data_directory                         | S:/Program Files/PostgreSQL/12/data                 | Sets the server's data directory.
 data_directory_mode                    | 0700                                                | Mode of the data directory.
 data_sync_retry                        | off                                                 | Whether to continue running after a failure to sync data files.
 DateStyle                              | ISO, YMD                                            | Sets the display format for date and time values.
 db_user_namespace                      | off                                                 | Enables per-database user names.
 deadlock_timeout                       | 1s                                                  | Sets the time to wait on a lock before checking for deadlock.
 debug_assertions                       | off                                                 | Shows whether the running server has assertion checks enabled.
 debug_pretty_print                     | on                                                  | Indents parse and plan tree displays.
 debug_print_parse                      | off                                                 | Logs each query's parse tree.
 debug_print_plan                       | off                                                 | Logs each query's execution plan.
 debug_print_rewritten                  | off                                                 | Logs each query's rewritten parse tree.
 default_statistics_target              | 100                                                 | Sets the default statistics target.
 default_table_access_method            | heap                                                | Sets the default table access method for new tables.
 default_tablespace                     |                                                     | Sets the default tablespace to create tables and indexes in.
 default_text_search_config             | pg_catalog.simple                                   | Sets default text search configuration.
 default_transaction_deferrable         | off                                                 | Sets the default deferrable status of new transactions.
 default_transaction_isolation          | read committed                                      | Sets the transaction isolation level of each new transaction.
 default_transaction_read_only          | off                                                 | Sets the default read-only status of new transactions.
 dynamic_library_path                   | $libdir                                             | Sets the path for dynamically loadable modules.
 dynamic_shared_memory_type             | windows                                             | Selects the dynamic shared memory implementation used.
 effective_cache_size                   | 4GB                                                 | Sets the planner's assumption about the total size of the data caches.
 effective_io_concurrency               | 0                                                   | Number of simultaneous requests that can be handled efficiently by the disk subsystem.
 enable_bitmapscan                      | on                                                  | Enables the planner's use of bitmap-scan plans.
 enable_gathermerge                     | on                                                  | Enables the planner's use of gather merge plans.
 enable_hashagg                         | on                                                  | Enables the planner's use of hashed aggregation plans.
 enable_hashjoin                        | on                                                  | Enables the planner's use of hash join plans.
 enable_indexonlyscan                   | on                                                  | Enables the planner's use of index-only-scan plans.
 enable_indexscan                       | on                                                  | Enables the planner's use of index-scan plans.
 enable_material                        | on                                                  | Enables the planner's use of materialization.
 enable_mergejoin                       | on                                                  | Enables the planner's use of merge join plans.
 enable_nestloop                        | on                                                  | Enables the planner's use of nested-loop join plans.
 enable_parallel_append                 | on                                                  | Enables the planner's use of parallel append plans.
 enable_parallel_hash                   | on                                                  | Enables the planner's use of parallel hash plans.
 enable_partition_pruning               | on                                                  | Enables plan-time and run-time partition pruning.
 enable_partitionwise_aggregate         | off                                                 | Enables partitionwise aggregation and grouping.
 enable_partitionwise_join              | off                                                 | Enables partitionwise join.
 enable_seqscan                         | on                                                  | Enables the planner's use of sequential-scan plans.
 enable_sort                            | on                                                  | Enables the planner's use of explicit sort steps.
 enable_tidscan                         | on                                                  | Enables the planner's use of TID scan plans.
 escape_string_warning                  | on                                                  | Warn about backslash escapes in ordinary string literals.
 event_source                           | PostgreSQL                                          | Sets the application name used to identify PostgreSQL messages in the event log.
 exit_on_error                          | off                                                 | Terminate session on any error.
 external_pid_file                      |                                                     | Writes the postmaster PID to the specified file.
 extra_float_digits                     | 1                                                   | Sets the number of digits displayed for floating-point values.
 force_parallel_mode                    | off                                                 | Forces use of parallel query facilities.
 from_collapse_limit                    | 8                                                   | Sets the FROM-list size beyond which subqueries are not collapsed.
 fsync                                  | on                                                  | Forces synchronization of updates to disk.
 full_page_writes                       | on                                                  | Writes full pages to WAL when first modified after a checkpoint.
 geqo                                   | on                                                  | Enables genetic query optimization.
 geqo_effort                            | 5                                                   | GEQO: effort is used to set the default for other GEQO parameters.
 geqo_generations                       | 0                                                   | GEQO: number of iterations of the algorithm.
 geqo_pool_size                         | 0                                                   | GEQO: number of individuals in the population.
 geqo_seed                              | 0                                                   | GEQO: seed for random path selection.
 geqo_selection_bias                    | 2                                                   | GEQO: selective pressure within the population.
 geqo_threshold                         | 12                                                  | Sets the threshold of FROM items beyond which GEQO is used.
 gin_fuzzy_search_limit                 | 0                                                   | Sets the maximum allowed result for exact search by GIN.
 gin_pending_list_limit                 | 4MB                                                 | Sets the maximum size of the pending list for GIN index.
 hba_file                               | S:/Program Files/PostgreSQL/12/data/pg_hba.conf     | Sets the server's "hba" configuration file.
 hot_standby                            | on                                                  | Allows connections and queries during recovery.
 hot_standby_feedback                   | off                                                 | Allows feedback from a hot standby to the primary that will avoid query conflicts.
 huge_pages                             | try                                                 | Use of huge pages on Linux or Windows.
 ident_file                             | S:/Program Files/PostgreSQL/12/data/pg_ident.conf   | Sets the server's "ident" configuration file.
 idle_in_transaction_session_timeout    | 0                                                   | Sets the maximum allowed duration of any idling transaction.
 ignore_checksum_failure                | off                                                 | Continues processing after a checksum failure.
 ignore_system_indexes                  | off                                                 | Disables reading from system indexes.
 integer_datetimes                      | on                                                  | Datetimes are integer based.
 IntervalStyle                          | postgres                                            | Sets the display format for interval values.
 jit                                    | on                                                  | Allow JIT compilation.
 jit_above_cost                         | 100000                                              | Perform JIT compilation if query is more expensive.
 jit_debugging_support                  | off                                                 | Register JIT compiled function with debugger.
 jit_dump_bitcode                       | off                                                 | Write out LLVM bitcode to facilitate JIT debugging.
 jit_expressions                        | on                                                  | Allow JIT compilation of expressions.
 jit_inline_above_cost                  | 500000                                              | Perform JIT inlining if query is more expensive.
 jit_optimize_above_cost                | 500000                                              | Optimize JITed functions if query is more expensive.
 jit_profiling_support                  | off                                                 | Register JIT compiled function with perf profiler.
 jit_provider                           | llvmjit                                             | JIT provider to use.
 jit_tuple_deforming                    | on                                                  | Allow JIT compilation of tuple deforming.
 join_collapse_limit                    | 8                                                   | Sets the FROM-list size beyond which JOIN constructs are not flattened.
 krb_caseins_users                      | off                                                 | Sets whether Kerberos and GSSAPI user names should be treated as case-insensitive.
 krb_server_keyfile                     |                                                     | Sets the location of the Kerberos server key file.
 lc_collate                             | Chinese (Simplified)_China.936                      | Shows the collation order locale.
 lc_ctype                               | Chinese (Simplified)_China.936                      | Shows the character classification and case conversion locale.
 lc_messages                            | Chinese (Simplified)_China.936                      | Sets the language in which messages are displayed.
 lc_monetary                            | Chinese (Simplified)_China.936                      | Sets the locale for formatting monetary amounts.
 lc_numeric                             | Chinese (Simplified)_China.936                      | Sets the locale for formatting numbers.
 lc_time                                | Chinese (Simplified)_China.936                      | Sets the locale for formatting date and time values.
 listen_addresses                       | *                                                   | Sets the host name or IP address(es) to listen to.
 lo_compat_privileges                   | off                                                 | Enables backward compatibility mode for privilege checks on large objects.
 local_preload_libraries                |                                                     | Lists unprivileged shared libraries to preload into each backend.
 lock_timeout                           | 0                                                   | Sets the maximum allowed duration of any wait for a lock.
 log_autovacuum_min_duration            | -1                                                  | Sets the minimum execution time above which autovacuum actions will be logged.
 log_checkpoints                        | off                                                 | Logs each checkpoint.
 log_connections                        | off                                                 | Logs each successful connection.
 log_destination                        | stderr                                              | Sets the destination for server log output.
 log_directory                          | log                                                 | Sets the destination directory for log files.
 log_disconnections                     | off                                                 | Logs end of a session, including duration.
 log_duration                           | off                                                 | Logs the duration of each completed SQL statement.
 log_error_verbosity                    | default                                             | Sets the verbosity of logged messages.
 log_executor_stats                     | off                                                 | Writes executor performance statistics to the server log.
 log_file_mode                          | 0640                                                | Sets the file permissions for log files.
 log_filename                           | postgresql-%Y-%m-%d_%H%M%S.log                      | Sets the file name pattern for log files.
 log_hostname                           | off                                                 | Logs the host name in the connection logs.
 log_line_prefix                        | %m [%p]                                             | Controls information prefixed to each log line.
 log_lock_waits                         | off                                                 | Logs long lock waits.
 log_min_duration_statement             | -1                                                  | Sets the minimum execution time above which statements will be logged.
 log_min_error_statement                | error                                               | Causes all statements generating error at or above this level to be logged.
 log_min_messages                       | warning                                             | Sets the message levels that are logged.
 log_parser_stats                       | off                                                 | Writes parser performance statistics to the server log.
 log_planner_stats                      | off                                                 | Writes planner performance statistics to the server log.
 log_replication_commands               | off                                                 | Logs each replication command.
 log_rotation_age                       | 1d                                                  | Automatic log file rotation will occur after N minutes.
 log_rotation_size                      | 10MB                                                | Automatic log file rotation will occur after N kilobytes.
 log_statement                          | none                                                | Sets the type of statements logged.
 log_statement_stats                    | off                                                 | Writes cumulative performance statistics to the server log.
 log_temp_files                         | -1                                                  | Log the use of temporary files larger than this number of kilobytes.
 log_timezone                           | GMT                                                 | Sets the time zone to use in log messages.
 log_transaction_sample_rate            | 0                                                   | Set the fraction of transactions to log for new transactions.
 log_truncate_on_rotation               | off                                                 | Truncate existing log files of same name during log rotation.
 logging_collector                      | on                                                  | Start a subprocess to capture stderr output and/or csvlogs into log files.
 maintenance_work_mem                   | 64MB                                                | Sets the maximum memory to be used for maintenance operations.
 max_connections                        | 100                                                 | Sets the maximum number of concurrent connections.
 max_files_per_process                  | 1000                                                | Sets the maximum number of simultaneously open files for each server process.
 max_function_args                      | 100                                                 | Shows the maximum number of function arguments.
 max_identifier_length                  | 63                                                  | Shows the maximum identifier length.
 max_index_keys                         | 32                                                  | Shows the maximum number of index keys.
 max_locks_per_transaction              | 64                                                  | Sets the maximum number of locks per transaction.
 max_logical_replication_workers        | 4                                                   | Maximum number of logical replication worker processes.
 max_parallel_maintenance_workers       | 2                                                   | Sets the maximum number of parallel processes per maintenance operation.
 max_parallel_workers                   | 8                                                   | Sets the maximum number of parallel workers that can be active at one time.
 max_parallel_workers_per_gather        | 2                                                   | Sets the maximum number of parallel processes per executor node.
 max_pred_locks_per_page                | 2                                                   | Sets the maximum number of predicate-locked tuples per page.
 max_pred_locks_per_relation            | -2                                                  | Sets the maximum number of predicate-locked pages and tuples per relation.
 max_pred_locks_per_transaction         | 64                                                  | Sets the maximum number of predicate locks per transaction.
 max_prepared_transactions              | 0                                                   | Sets the maximum number of simultaneously prepared transactions.
 max_replication_slots                  | 10                                                  | Sets the maximum number of simultaneously defined replication slots.
 max_stack_depth                        | 2MB                                                 | Sets the maximum stack depth, in kilobytes.
 max_standby_archive_delay              | 30s                                                 | Sets the maximum delay before canceling queries when a hot standby server is processing archived WAL data.
 max_standby_streaming_delay            | 30s                                                 | Sets the maximum delay before canceling queries when a hot standby server is processing streamed WAL data.
 max_sync_workers_per_subscription      | 2                                                   | Maximum number of table synchronization workers per subscription.
 max_wal_senders                        | 10                                                  | Sets the maximum number of simultaneously running WAL sender processes.
 max_wal_size                           | 1GB                                                 | Sets the WAL size that triggers a checkpoint.
 max_worker_processes                   | 8                                                   | Maximum number of concurrent worker processes.
 min_parallel_index_scan_size           | 512kB                                               | Sets the minimum amount of index data for a parallel scan.
 min_parallel_table_scan_size           | 8MB                                                 | Sets the minimum amount of table data for a parallel scan.
 min_wal_size                           | 80MB                                                | Sets the minimum size to shrink the WAL to.
 old_snapshot_threshold                 | -1                                                  | Time before a snapshot is too old to read pages changed after the snapshot was taken.
 operator_precedence_warning            | off                                                 | Emit a warning for constructs that changed meaning since PostgreSQL 9.4.
 parallel_leader_participation          | on                                                  | Controls whether Gather and Gather Merge also run subplans.
 parallel_setup_cost                    | 1000                                                | Sets the planner's estimate of the cost of starting up worker processes for parallel query.
 parallel_tuple_cost                    | 0.1                                                 | Sets the planner's estimate of the cost of passing each tuple (row) from worker to master backend.
 password_encryption                    | md5                                                 | Encrypt passwords.
 plan_cache_mode                        | auto                                                | Controls the planner's selection of custom or generic plan.
 port                                   | 5432                                                | Sets the TCP port the server listens on.
 post_auth_delay                        | 0                                                   | Waits N seconds on connection startup after authentication.
 pre_auth_delay                         | 0                                                   | Waits N seconds on connection startup before authentication.
 primary_conninfo                       |                                                     | Sets the connection string to be used to connect to the sending server.
 primary_slot_name                      |                                                     | Sets the name of the replication slot to use on the sending server.
 promote_trigger_file                   |                                                     | Specifies a file name whose presence ends recovery in the standby.
 quote_all_identifiers                  | off                                                 | When generating SQL fragments, quote all identifiers.
 random_page_cost                       | 4                                                   | Sets the planner's estimate of the cost of a nonsequentially fetched disk page.
 recovery_end_command                   |                                                     | Sets the shell command that will be executed once at the end of recovery.
 recovery_min_apply_delay               | 0                                                   | Sets the minimum delay for applying changes during recovery.
 recovery_target                        |                                                     | Set to "immediate" to end recovery as soon as a consistent state is reached.
 recovery_target_action                 | pause                                               | Sets the action to perform upon reaching the recovery target.
 recovery_target_inclusive              | on                                                  | Sets whether to include or exclude transaction with recovery target.
 recovery_target_lsn                    |                                                     | Sets the LSN of the write-ahead log location up to which recovery will proceed.
 recovery_target_name                   |                                                     | Sets the named restore point up to which recovery will proceed.
 recovery_target_time                   |                                                     | Sets the time stamp up to which recovery will proceed.
 recovery_target_timeline               | latest                                              | Specifies the timeline to recover into.
 recovery_target_xid                    |                                                     | Sets the transaction ID up to which recovery will proceed.
 restart_after_crash                    | on                                                  | Reinitialize server after backend crash.
 restore_command                        |                                                     | Sets the shell command that will retrieve an archived WAL file.
 row_security                           | on                                                  | Enable row security.
 search_path                            | "$user", public                                     | Sets the schema search order for names that are not schema-qualified.
 segment_size                           | 1GB                                                 | Shows the number of pages per disk file.
 seq_page_cost                          | 1                                                   | Sets the planner's estimate of the cost of a sequentially fetched disk page.
 server_encoding                        | UTF8                                                | Sets the server (database) character set encoding.
 server_version                         | 12.0                                                | Shows the server version.
 server_version_num                     | 120000                                              | Shows the server version as an integer.
 session_preload_libraries              |                                                     | Lists shared libraries to preload into each backend.
 session_replication_role               | origin                                              | Sets the session's behavior for triggers and rewrite rules.
 shared_buffers                         | 128MB                                               | Sets the number of shared memory buffers used by the server.
 shared_memory_type                     | windows                                             | Selects the shared memory implementation used for the main shared memory region.
 shared_preload_libraries               |                                                     | Lists shared libraries to preload into server.
 ssl                                    | off                                                 | Enables SSL connections.
 ssl_ca_file                            |                                                     | Location of the SSL certificate authority file.
 ssl_cert_file                          | server.crt                                          | Location of the SSL server certificate file.
 ssl_ciphers                            | HIGH:MEDIUM:+3DES:!aNULL                            | Sets the list of allowed SSL ciphers.
 ssl_crl_file                           |                                                     | Location of the SSL certificate revocation list file.
 ssl_dh_params_file                     |                                                     | Location of the SSL DH parameters file.
 ssl_ecdh_curve                         | prime256v1                                          | Sets the curve to use for ECDH.
 ssl_key_file                           | server.key                                          | Location of the SSL server private key file.
 ssl_library                            | OpenSSL                                             | Name of the SSL library.
 ssl_max_protocol_version               |                                                     | Sets the maximum SSL/TLS protocol version to use.
 ssl_min_protocol_version               | TLSv1                                               | Sets the minimum SSL/TLS protocol version to use.
 ssl_passphrase_command                 |                                                     | Command to obtain passphrases for SSL.
 ssl_passphrase_command_supports_reload | off                                                 | Also use ssl_passphrase_command during server reload.
 ssl_prefer_server_ciphers              | on                                                  | Give priority to server ciphersuite order.
 standard_conforming_strings            | on                                                  | Causes '...' strings to treat backslashes literally.
 statement_timeout                      | 0                                                   | Sets the maximum allowed duration of any statement.
 stats_temp_directory                   | pg_stat_tmp                                         | Writes temporary statistics files to the specified directory.
 superuser_reserved_connections         | 3                                                   | Sets the number of connection slots reserved for superusers.
 synchronize_seqscans                   | on                                                  | Enable synchronized sequential scans.
 synchronous_commit                     | on                                                  | Sets the current transaction's synchronization level.
 synchronous_standby_names              |                                                     | Number of synchronous standbys and list of names of potential synchronous ones.
 syslog_facility                        | none                                                | Sets the syslog "facility" to be used when syslog enabled.
 syslog_ident                           | postgres                                            | Sets the program name used to identify PostgreSQL messages in syslog.
 syslog_sequence_numbers                | on                                                  | Add sequence number to syslog messages to avoid duplicate suppression.
 syslog_split_messages                  | on                                                  | Split messages sent to syslog by lines and to fit into 1024 bytes.
 tcp_keepalives_count                   | 0                                                   | Maximum number of TCP keepalive retransmits.
 tcp_keepalives_idle                    | -1                                                  | Time between issuing TCP keepalives.
 tcp_keepalives_interval                | -1                                                  | Time between TCP keepalive retransmits.
 tcp_user_timeout                       | 0                                                   | TCP user timeout.
 temp_buffers                           | 8MB                                                 | Sets the maximum number of temporary buffers used by each session.
 temp_file_limit                        | -1                                                  | Limits the total size of all temporary files used by each process.
 temp_tablespaces                       |                                                     | Sets the tablespace(s) to use for temporary tables and sort files.
 TimeZone                               | GMT                                                 | Sets the time zone for displaying and interpreting time stamps.
 timezone_abbreviations                 | Default                                             | Selects a file of time zone abbreviations.
 trace_notify                           | off                                                 | Generates debugging output for LISTEN and NOTIFY.
 trace_recovery_messages                | log                                                 | Enables logging of recovery-related debugging information.
 trace_sort                             | off                                                 | Emit information about resource usage in sorting.
 track_activities                       | on                                                  | Collects information about executing commands.
 track_activity_query_size              | 1kB                                                 | Sets the size reserved for pg_stat_activity.query, in bytes.
 track_commit_timestamp                 | off                                                 | Collects transaction commit time.
 track_counts                           | on                                                  | Collects statistics on database activity.
 track_functions                        | none                                                | Collects function-level statistics on database activity.
 track_io_timing                        | off                                                 | Collects timing statistics for database I/O activity.
 transaction_deferrable                 | off                                                 | Whether to defer a read-only serializable transaction until it can be executed with no possible serialization failures.
 transaction_isolation                  | read committed                                      | Sets the current transaction's isolation level.
 transaction_read_only                  | off                                                 | Sets the current transaction's read-only status.
 transform_null_equals                  | off                                                 | Treats "expr=NULL" as "expr IS NULL".
 unix_socket_directories                |                                                     | Sets the directories where Unix-domain sockets will be created.
 unix_socket_group                      |                                                     | Sets the owning group of the Unix-domain socket.
 unix_socket_permissions                | 0777                                                | Sets the access permissions of the Unix-domain socket.
 update_process_title                   | off                                                 | Updates the process title to show the active SQL command.
 vacuum_cleanup_index_scale_factor      | 0.1                                                 | Number of tuple inserts prior to index cleanup as a fraction of reltuples.
 vacuum_cost_delay                      | 0                                                   | Vacuum cost delay in milliseconds.
 vacuum_cost_limit                      | 200                                                 | Vacuum cost amount available before napping.
 vacuum_cost_page_dirty                 | 20                                                  | Vacuum cost for a page dirtied by vacuum.
 vacuum_cost_page_hit                   | 1                                                   | Vacuum cost for a page found in the buffer cache.
 vacuum_cost_page_miss                  | 10                                                  | Vacuum cost for a page not found in the buffer cache.
 vacuum_defer_cleanup_age               | 0                                                   | Number of transactions by which VACUUM and HOT cleanup should be deferred, if any.
 vacuum_freeze_min_age                  | 50000000                                            | Minimum age at which VACUUM should freeze a table row.
 vacuum_freeze_table_age                | 150000000                                           | Age at which VACUUM should scan whole table to freeze tuples.
 vacuum_multixact_freeze_min_age        | 5000000                                             | Minimum age at which VACUUM should freeze a MultiXactId in a table row.
 vacuum_multixact_freeze_table_age      | 150000000                                           | Multixact age at which VACUUM should scan whole table to freeze tuples.
 wal_block_size                         | 8192                                                | Shows the block size in the write ahead log.
 wal_buffers                            | 4MB                                                 | Sets the number of disk-page buffers in shared memory for WAL.
 wal_compression                        | off                                                 | Compresses full-page writes written in WAL file.
 wal_consistency_checking               |                                                     | Sets the WAL resource managers for which WAL consistency checks are done.
 wal_init_zero                          | on                                                  | Writes zeroes to new WAL files before first use.
 wal_keep_segments                      | 0                                                   | Sets the number of WAL files held for standby servers.
 wal_level                              | replica                                             | Set the level of information written to the WAL.
 wal_log_hints                          | off                                                 | Writes full pages to WAL when first modified after a checkpoint, even for a non-critical modifications.
 wal_receiver_status_interval           | 10s                                                 | Sets the maximum interval between WAL receiver status reports to the sending server.
 wal_receiver_timeout                   | 1min                                                | Sets the maximum wait time to receive data from the sending server.
 wal_recycle                            | on                                                  | Recycles WAL files by renaming them.
 wal_retrieve_retry_interval            | 5s                                                  | Sets the time to wait before retrying to retrieve WAL after a failed attempt.
 wal_segment_size                       | 16MB                                                | Shows the size of write ahead log segments.
 wal_sender_timeout                     | 1min                                                | Sets the maximum time to wait for WAL replication.
 wal_sync_method                        | open_datasync                                       | Selects the method used for forcing WAL updates to disk.
 wal_writer_delay                       | 200ms                                               | Time between WAL flushes performed in the WAL writer.
 wal_writer_flush_after                 | 1MB                                                 | Amount of WAL written out by WAL writer that triggers a flush.
 work_mem                               | 4MB                                                 | Sets the maximum memory to be used for query workspaces.
 xmlbinary                              | base64                                              | Sets how binary values are to be encoded in XML.
 xmloption                              | content                                             | Sets whether XML data in implicit parsing and serialization operations is to be considered as documents or content fragments.
 zero_damaged_pages                     | off                                                 | Continues processing past damaged page headers.
 

Comment

*

沪ICP备14014813号

沪公网安备 31010802001379号