PostgreSQL 参数设置简介
最近更新：2023-09-14 10:10:58
适用范围
PostgreSQL 9 and later
目的
PostgreSQL参数修改：实例级别、数据库级别、用户级别
详细方案
一、Postgresql 参数文件查看和解释
postgres=# show config_file;
-[ RECORD 1 ]----------------------------
config_file | /data/pgsql/postgresql.conf
postgres=# show hba_file;
-[ RECORD 1 ]---------------------
hba_file | /data/pgsql/pg_hba.conf
postgres=# show ident_file;
-[ RECORD 1 ]-------------------------
ident_file | /data/pgsql/pg_ident.conf
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 | 512kB | 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 | 256kB | 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 | UTF8 | 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 | /data/pgsql/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 | on | Shows whether data checksums are turned on for this cluster.
data_directory | /data/pgsql | 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, MDY | 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.english | 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 | posix | 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 | 1 | Number of simultaneous requests that can be handled efficiently by the disk subsystem.......
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