pg_settings.html

<table border="1">
  <tr>
    <th align="center">name</th>
    <th align="center">setting</th>
    <th align="center">short_desc</th>
  </tr>
  <tr valign="top">
    <td align="left">allow_system_table_mods</td>
    <td align="left">off</td>
    <td align="left">Allows modifications of the structure of system tables.</td>
  </tr>
  <tr valign="top">
    <td align="left">application_name</td>
    <td align="left">psql</td>
    <td align="left">Sets the application name to be reported in statistics and logs.</td>
  </tr>
  <tr valign="top">
    <td align="left">archive_command</td>
    <td align="left">(disabled)</td>
    <td align="left">Sets the shell command that will be called to archive a WAL file.</td>
  </tr>
  <tr valign="top">
    <td align="left">archive_mode</td>
    <td align="left">off</td>
    <td align="left">Allows archiving of WAL files using archive_command.</td>
  </tr>
  <tr valign="top">
    <td align="left">archive_timeout</td>
    <td align="left">0</td>
    <td align="left">Forces a switch to the next WAL file if a new file has not been started within N seconds.</td>
  </tr>
  <tr valign="top">
    <td align="left">array_nulls</td>
    <td align="left">on</td>
    <td align="left">Enable input of NULL elements in arrays.</td>
  </tr>
  <tr valign="top">
    <td align="left">authentication_timeout</td>
    <td align="left">60</td>
    <td align="left">Sets the maximum allowed time to complete client authentication.</td>
  </tr>
  <tr valign="top">
    <td align="left">autovacuum</td>
    <td align="left">on</td>
    <td align="left">Starts the autovacuum subprocess.</td>
  </tr>
  <tr valign="top">
    <td align="left">autovacuum_analyze_scale_factor</td>
    <td align="left">0.1</td>
    <td align="left">Number of tuple inserts, updates, or deletes prior to analyze as a fraction of reltuples.</td>
  </tr>
  <tr valign="top">
    <td align="left">autovacuum_analyze_threshold</td>
    <td align="left">50</td>
    <td align="left">Minimum number of tuple inserts, updates, or deletes prior to analyze.</td>
  </tr>
  <tr valign="top">
    <td align="left">autovacuum_freeze_max_age</td>
    <td align="left">200000000</td>
    <td align="left">Age at which to autovacuum a table to prevent transaction ID wraparound.</td>
  </tr>
  <tr valign="top">
    <td align="left">autovacuum_max_workers</td>
    <td align="left">3</td>
    <td align="left">Sets the maximum number of simultaneously running autovacuum worker processes.</td>
  </tr>
  <tr valign="top">
    <td align="left">autovacuum_multixact_freeze_max_age</td>
    <td align="left">400000000</td>
    <td align="left">Multixact age at which to autovacuum a table to prevent multixact wraparound.</td>
  </tr>
  <tr valign="top">
    <td align="left">autovacuum_naptime</td>
    <td align="left">60</td>
    <td align="left">Time to sleep between autovacuum runs.</td>
  </tr>
  <tr valign="top">
    <td align="left">autovacuum_vacuum_cost_delay</td>
    <td align="left">20</td>
    <td align="left">Vacuum cost delay in milliseconds, for autovacuum.</td>
  </tr>
  <tr valign="top">
    <td align="left">autovacuum_vacuum_cost_limit</td>
    <td align="left">-1</td>
    <td align="left">Vacuum cost amount available before napping, for autovacuum.</td>
  </tr>
  <tr valign="top">
    <td align="left">autovacuum_vacuum_scale_factor</td>
    <td align="left">0.2</td>
    <td align="left">Number of tuple updates or deletes prior to vacuum as a fraction of reltuples.</td>
  </tr>
  <tr valign="top">
    <td align="left">autovacuum_vacuum_threshold</td>
    <td align="left">50</td>
    <td align="left">Minimum number of tuple updates or deletes prior to vacuum.</td>
  </tr>
  <tr valign="top">
    <td align="left">autovacuum_work_mem</td>
    <td align="left">-1</td>
    <td align="left">Sets the maximum memory to be used by each autovacuum worker process.</td>
  </tr>
  <tr valign="top">
    <td align="left">backend_flush_after</td>
    <td align="left">0</td>
    <td align="left">Number of pages after which previously performed writes are flushed to disk.</td>
  </tr>
  <tr valign="top">
    <td align="left">backslash_quote</td>
    <td align="left">safe_encoding</td>
    <td align="left">Sets whether &quot;\'&quot; is allowed in string literals.</td>
  </tr>
  <tr valign="top">
    <td align="left">bgwriter_delay</td>
    <td align="left">200</td>
    <td align="left">Background writer sleep time between rounds.</td>
  </tr>
  <tr valign="top">
    <td align="left">bgwriter_flush_after</td>
    <td align="left">0</td>
    <td align="left">Number of pages after which previously performed writes are flushed to disk.</td>
  </tr>
  <tr valign="top">
    <td align="left">bgwriter_lru_maxpages</td>
    <td align="left">100</td>
    <td align="left">Background writer maximum number of LRU pages to flush per round.</td>
  </tr>
  <tr valign="top">
    <td align="left">bgwriter_lru_multiplier</td>
    <td align="left">2</td>
    <td align="left">Multiple of the average buffer usage to free per round.</td>
  </tr>
  <tr valign="top">
    <td align="left">block_size</td>
    <td align="left">8192</td>
    <td align="left">Shows the size of a disk block.</td>
  </tr>
  <tr valign="top">
    <td align="left">bonjour</td>
    <td align="left">off</td>
    <td align="left">Enables advertising the server via Bonjour.</td>
  </tr>
  <tr valign="top">
    <td align="left">bonjour_name</td>
    <td align="left">&nbsp; </td>
    <td align="left">Sets the Bonjour service name.</td>
  </tr>
  <tr valign="top">
    <td align="left">bytea_output</td>
    <td align="left">hex</td>
    <td align="left">Sets the output format for bytea.</td>
  </tr>
  <tr valign="top">
    <td align="left">check_function_bodies</td>
    <td align="left">on</td>
    <td align="left">Check function bodies during CREATE FUNCTION.</td>
  </tr>
  <tr valign="top">
    <td align="left">checkpoint_completion_target</td>
    <td align="left">0.5</td>
    <td align="left">Time spent flushing dirty buffers during checkpoint, as fraction of checkpoint interval.</td>
  </tr>
  <tr valign="top">
    <td align="left">checkpoint_flush_after</td>
    <td align="left">0</td>
    <td align="left">Number of pages after which previously performed writes are flushed to disk.</td>
  </tr>
  <tr valign="top">
    <td align="left">checkpoint_timeout</td>
    <td align="left">300</td>
    <td align="left">Sets the maximum time between automatic WAL checkpoints.</td>
  </tr>
  <tr valign="top">
    <td align="left">checkpoint_warning</td>
    <td align="left">30</td>
    <td align="left">Enables warnings if checkpoint segments are filled more frequently than this.</td>
  </tr>
  <tr valign="top">
    <td align="left">client_encoding</td>
    <td align="left">UTF8</td>
    <td align="left">Sets the client's character set encoding.</td>
  </tr>
  <tr valign="top">
    <td align="left">client_min_messages</td>
    <td align="left">notice</td>
    <td align="left">Sets the message levels that are sent to the client.</td>
  </tr>
  <tr valign="top">
    <td align="left">cluster_name</td>
    <td align="left">&nbsp; </td>
    <td align="left">Sets the name of the cluster, which is included in the process title.</td>
  </tr>
  <tr valign="top">
    <td align="left">commit_delay</td>
    <td align="left">0</td>
    <td align="left">Sets the delay in microseconds between transaction commit and flushing WAL to disk.</td>
  </tr>
  <tr valign="top">
    <td align="left">commit_siblings</td>
    <td align="left">5</td>
    <td align="left">Sets the minimum concurrent open transactions before performing commit_delay.</td>
  </tr>
  <tr valign="top">
    <td align="left">config_file</td>
    <td align="left">/usr/local/var/postgres/postgresql.conf</td>
    <td align="left">Sets the server's main configuration file.</td>
  </tr>
  <tr valign="top">
    <td align="left">constraint_exclusion</td>
    <td align="left">partition</td>
    <td align="left">Enables the planner to use constraints to optimize queries.</td>
  </tr>
  <tr valign="top">
    <td align="left">cpu_index_tuple_cost</td>
    <td align="left">0.005</td>
    <td align="left">Sets the planner's estimate of the cost of processing each index entry during an index scan.</td>
  </tr>
  <tr valign="top">
    <td align="left">cpu_operator_cost</td>
    <td align="left">0.0025</td>
    <td align="left">Sets the planner's estimate of the cost of processing each operator or function call.</td>
  </tr>
  <tr valign="top">
    <td align="left">cpu_tuple_cost</td>
    <td align="left">0.01</td>
    <td align="left">Sets the planner's estimate of the cost of processing each tuple (row).</td>
  </tr>
  <tr valign="top">
    <td align="left">cursor_tuple_fraction</td>
    <td align="left">0.1</td>
    <td align="left">Sets the planner's estimate of the fraction of a cursor's rows that will be retrieved.</td>
  </tr>
  <tr valign="top">
    <td align="left">data_checksums</td>
    <td align="left">off</td>
    <td align="left">Shows whether data checksums are turned on for this cluster.</td>
  </tr>
  <tr valign="top">
    <td align="left">data_directory</td>
    <td align="left">/usr/local/var/postgres</td>
    <td align="left">Sets the server's data directory.</td>
  </tr>
  <tr valign="top">
    <td align="left">data_directory_mode</td>
    <td align="left">0700</td>
    <td align="left">Mode of the data directory.</td>
  </tr>
  <tr valign="top">
    <td align="left">DateStyle</td>
    <td align="left">ISO, MDY</td>
    <td align="left">Sets the display format for date and time values.</td>
  </tr>
  <tr valign="top">
    <td align="left">db_user_namespace</td>
    <td align="left">off</td>
    <td align="left">Enables per-database user names.</td>
  </tr>
  <tr valign="top">
    <td align="left">deadlock_timeout</td>
    <td align="left">1000</td>
    <td align="left">Sets the time to wait on a lock before checking for deadlock.</td>
  </tr>
  <tr valign="top">
    <td align="left">debug_assertions</td>
    <td align="left">off</td>
    <td align="left">Shows whether the running server has assertion checks enabled.</td>
  </tr>
  <tr valign="top">
    <td align="left">debug_pretty_print</td>
    <td align="left">on</td>
    <td align="left">Indents parse and plan tree displays.</td>
  </tr>
  <tr valign="top">
    <td align="left">debug_print_parse</td>
    <td align="left">off</td>
    <td align="left">Logs each query's parse tree.</td>
  </tr>
  <tr valign="top">
    <td align="left">debug_print_plan</td>
    <td align="left">off</td>
    <td align="left">Logs each query's execution plan.</td>
  </tr>
  <tr valign="top">
    <td align="left">debug_print_rewritten</td>
    <td align="left">off</td>
    <td align="left">Logs each query's rewritten parse tree.</td>
  </tr>
  <tr valign="top">
    <td align="left">default_statistics_target</td>
    <td align="left">100</td>
    <td align="left">Sets the default statistics target.</td>
  </tr>
  <tr valign="top">
    <td align="left">default_tablespace</td>
    <td align="left">&nbsp; </td>
    <td align="left">Sets the default tablespace to create tables and indexes in.</td>
  </tr>
  <tr valign="top">
    <td align="left">default_text_search_config</td>
    <td align="left">pg_catalog.english</td>
    <td align="left">Sets default text search configuration.</td>
  </tr>
  <tr valign="top">
    <td align="left">default_transaction_deferrable</td>
    <td align="left">off</td>
    <td align="left">Sets the default deferrable status of new transactions.</td>
  </tr>
  <tr valign="top">
    <td align="left">default_transaction_isolation</td>
    <td align="left">read committed</td>
    <td align="left">Sets the transaction isolation level of each new transaction.</td>
  </tr>
  <tr valign="top">
    <td align="left">default_transaction_read_only</td>
    <td align="left">off</td>
    <td align="left">Sets the default read-only status of new transactions.</td>
  </tr>
  <tr valign="top">
    <td align="left">default_with_oids</td>
    <td align="left">off</td>
    <td align="left">Create new tables with OIDs by default.</td>
  </tr>
  <tr valign="top">
    <td align="left">dynamic_library_path</td>
    <td align="left">$libdir</td>
    <td align="left">Sets the path for dynamically loadable modules.</td>
  </tr>
  <tr valign="top">
    <td align="left">dynamic_shared_memory_type</td>
    <td align="left">posix</td>
    <td align="left">Selects the dynamic shared memory implementation used.</td>
  </tr>
  <tr valign="top">
    <td align="left">effective_cache_size</td>
    <td align="left">524288</td>
    <td align="left">Sets the planner's assumption about the total size of the data caches.</td>
  </tr>
  <tr valign="top">
    <td align="left">effective_io_concurrency</td>
    <td align="left">0</td>
    <td align="left">Number of simultaneous requests that can be handled efficiently by the disk subsystem.</td>
  </tr>
  <tr valign="top">
    <td align="left">enable_bitmapscan</td>
    <td align="left">on</td>
    <td align="left">Enables the planner's use of bitmap-scan plans.</td>
  </tr>
  <tr valign="top">
    <td align="left">enable_gathermerge</td>
    <td align="left">on</td>
    <td align="left">Enables the planner's use of gather merge plans.</td>
  </tr>
  <tr valign="top">
    <td align="left">enable_hashagg</td>
    <td align="left">on</td>
    <td align="left">Enables the planner's use of hashed aggregation plans.</td>
  </tr>
  <tr valign="top">
    <td align="left">enable_hashjoin</td>
    <td align="left">on</td>
    <td align="left">Enables the planner's use of hash join plans.</td>
  </tr>
  <tr valign="top">
    <td align="left">enable_indexonlyscan</td>
    <td align="left">on</td>
    <td align="left">Enables the planner's use of index-only-scan plans.</td>
  </tr>
  <tr valign="top">
    <td align="left">enable_indexscan</td>
    <td align="left">on</td>
    <td align="left">Enables the planner's use of index-scan plans.</td>
  </tr>
  <tr valign="top">
    <td align="left">enable_material</td>
    <td align="left">on</td>
    <td align="left">Enables the planner's use of materialization.</td>
  </tr>
  <tr valign="top">
    <td align="left">enable_mergejoin</td>
    <td align="left">on</td>
    <td align="left">Enables the planner's use of merge join plans.</td>
  </tr>
  <tr valign="top">
    <td align="left">enable_nestloop</td>
    <td align="left">on</td>
    <td align="left">Enables the planner's use of nested-loop join plans.</td>
  </tr>
  <tr valign="top">
    <td align="left">enable_parallel_append</td>
    <td align="left">on</td>
    <td align="left">Enables the planner's use of parallel append plans.</td>
  </tr>
  <tr valign="top">
    <td align="left">enable_parallel_hash</td>
    <td align="left">on</td>
    <td align="left">Enables the planner's use of parallel hash plans.</td>
  </tr>
  <tr valign="top">
    <td align="left">enable_partition_pruning</td>
    <td align="left">on</td>
    <td align="left">Enable plan-time and run-time partition pruning.</td>
  </tr>
  <tr valign="top">
    <td align="left">enable_partitionwise_aggregate</td>
    <td align="left">off</td>
    <td align="left">Enables partitionwise aggregation and grouping.</td>
  </tr>
  <tr valign="top">
    <td align="left">enable_partitionwise_join</td>
    <td align="left">off</td>
    <td align="left">Enables partitionwise join.</td>
  </tr>
  <tr valign="top">
    <td align="left">enable_seqscan</td>
    <td align="left">on</td>
    <td align="left">Enables the planner's use of sequential-scan plans.</td>
  </tr>
  <tr valign="top">
    <td align="left">enable_sort</td>
    <td align="left">on</td>
    <td align="left">Enables the planner's use of explicit sort steps.</td>
  </tr>
  <tr valign="top">
    <td align="left">enable_tidscan</td>
    <td align="left">on</td>
    <td align="left">Enables the planner's use of TID scan plans.</td>
  </tr>
  <tr valign="top">
    <td align="left">escape_string_warning</td>
    <td align="left">on</td>
    <td align="left">Warn about backslash escapes in ordinary string literals.</td>
  </tr>
  <tr valign="top">
    <td align="left">event_source</td>
    <td align="left">PostgreSQL</td>
    <td align="left">Sets the application name used to identify PostgreSQL messages in the event log.</td>
  </tr>
  <tr valign="top">
    <td align="left">exit_on_error</td>
    <td align="left">off</td>
    <td align="left">Terminate session on any error.</td>
  </tr>
  <tr valign="top">
    <td align="left">external_pid_file</td>
    <td align="left">&nbsp; </td>
    <td align="left">Writes the postmaster PID to the specified file.</td>
  </tr>
  <tr valign="top">
    <td align="left">extra_float_digits</td>
    <td align="left">0</td>
    <td align="left">Sets the number of digits displayed for floating-point values.</td>
  </tr>
  <tr valign="top">
    <td align="left">force_parallel_mode</td>
    <td align="left">off</td>
    <td align="left">Forces use of parallel query facilities.</td>
  </tr>
  <tr valign="top">
    <td align="left">from_collapse_limit</td>
    <td align="left">8</td>
    <td align="left">Sets the FROM-list size beyond which subqueries are not collapsed.</td>
  </tr>
  <tr valign="top">
    <td align="left">fsync</td>
    <td align="left">on</td>
    <td align="left">Forces synchronization of updates to disk.</td>
  </tr>
  <tr valign="top">
    <td align="left">full_page_writes</td>
    <td align="left">on</td>
    <td align="left">Writes full pages to WAL when first modified after a checkpoint.</td>
  </tr>
  <tr valign="top">
    <td align="left">geqo</td>
    <td align="left">on</td>
    <td align="left">Enables genetic query optimization.</td>
  </tr>
  <tr valign="top">
    <td align="left">geqo_effort</td>
    <td align="left">5</td>
    <td align="left">GEQO: effort is used to set the default for other GEQO parameters.</td>
  </tr>
  <tr valign="top">
    <td align="left">geqo_generations</td>
    <td align="left">0</td>
    <td align="left">GEQO: number of iterations of the algorithm.</td>
  </tr>
  <tr valign="top">
    <td align="left">geqo_pool_size</td>
    <td align="left">0</td>
    <td align="left">GEQO: number of individuals in the population.</td>
  </tr>
  <tr valign="top">
    <td align="left">geqo_seed</td>
    <td align="left">0</td>
    <td align="left">GEQO: seed for random path selection.</td>
  </tr>
  <tr valign="top">
    <td align="left">geqo_selection_bias</td>
    <td align="left">2</td>
    <td align="left">GEQO: selective pressure within the population.</td>
  </tr>
  <tr valign="top">
    <td align="left">geqo_threshold</td>
    <td align="left">12</td>
    <td align="left">Sets the threshold of FROM items beyond which GEQO is used.</td>
  </tr>
  <tr valign="top">
    <td align="left">gin_fuzzy_search_limit</td>
    <td align="left">0</td>
    <td align="left">Sets the maximum allowed result for exact search by GIN.</td>
  </tr>
  <tr valign="top">
    <td align="left">gin_pending_list_limit</td>
    <td align="left">4096</td>
    <td align="left">Sets the maximum size of the pending list for GIN index.</td>
  </tr>
  <tr valign="top">
    <td align="left">hba_file</td>
    <td align="left">/usr/local/var/postgres/pg_hba.conf</td>
    <td align="left">Sets the server's &quot;hba&quot; configuration file.</td>
  </tr>
  <tr valign="top">
    <td align="left">hot_standby</td>
    <td align="left">on</td>
    <td align="left">Allows connections and queries during recovery.</td>
  </tr>
  <tr valign="top">
    <td align="left">hot_standby_feedback</td>
    <td align="left">off</td>
    <td align="left">Allows feedback from a hot standby to the primary that will avoid query conflicts.</td>
  </tr>
  <tr valign="top">
    <td align="left">huge_pages</td>
    <td align="left">try</td>
    <td align="left">Use of huge pages on Linux or Windows.</td>
  </tr>
  <tr valign="top">
    <td align="left">ident_file</td>
    <td align="left">/usr/local/var/postgres/pg_ident.conf</td>
    <td align="left">Sets the server's &quot;ident&quot; configuration file.</td>
  </tr>
  <tr valign="top">
    <td align="left">idle_in_transaction_session_timeout</td>
    <td align="left">0</td>
    <td align="left">Sets the maximum allowed duration of any idling transaction.</td>
  </tr>
  <tr valign="top">
    <td align="left">ignore_checksum_failure</td>
    <td align="left">off</td>
    <td align="left">Continues processing after a checksum failure.</td>
  </tr>
  <tr valign="top">
    <td align="left">ignore_system_indexes</td>
    <td align="left">off</td>
    <td align="left">Disables reading from system indexes.</td>
  </tr>
  <tr valign="top">
    <td align="left">integer_datetimes</td>
    <td align="left">on</td>
    <td align="left">Datetimes are integer based.</td>
  </tr>
  <tr valign="top">
    <td align="left">IntervalStyle</td>
    <td align="left">postgres</td>
    <td align="left">Sets the display format for interval values.</td>
  </tr>
  <tr valign="top">
    <td align="left">jit</td>
    <td align="left">off</td>
    <td align="left">Allow JIT compilation.</td>
  </tr>
  <tr valign="top">
    <td align="left">jit_above_cost</td>
    <td align="left">100000</td>
    <td align="left">Perform JIT compilation if query is more expensive.</td>
  </tr>
  <tr valign="top">
    <td align="left">jit_debugging_support</td>
    <td align="left">off</td>
    <td align="left">Register JIT compiled function with debugger.</td>
  </tr>
  <tr valign="top">
    <td align="left">jit_dump_bitcode</td>
    <td align="left">off</td>
    <td align="left">Write out LLVM bitcode to facilitate JIT debugging.</td>
  </tr>
  <tr valign="top">
    <td align="left">jit_expressions</td>
    <td align="left">on</td>
    <td align="left">Allow JIT compilation of expressions.</td>
  </tr>
  <tr valign="top">
    <td align="left">jit_inline_above_cost</td>
    <td align="left">500000</td>
    <td align="left">Perform JIT inlining if query is more expensive.</td>
  </tr>
  <tr valign="top">
    <td align="left">jit_optimize_above_cost</td>
    <td align="left">500000</td>
    <td align="left">Optimize JITed functions if query is more expensive.</td>
  </tr>
  <tr valign="top">
    <td align="left">jit_profiling_support</td>
    <td align="left">off</td>
    <td align="left">Register JIT compiled function with perf profiler.</td>
  </tr>
  <tr valign="top">
    <td align="left">jit_provider</td>
    <td align="left">llvmjit</td>
    <td align="left">JIT provider to use.</td>
  </tr>
  <tr valign="top">
    <td align="left">jit_tuple_deforming</td>
    <td align="left">on</td>
    <td align="left">Allow JIT compilation of tuple deforming.</td>
  </tr>
  <tr valign="top">
    <td align="left">join_collapse_limit</td>
    <td align="left">8</td>
    <td align="left">Sets the FROM-list size beyond which JOIN constructs are not flattened.</td>
  </tr>
  <tr valign="top">
    <td align="left">krb_caseins_users</td>
    <td align="left">off</td>
    <td align="left">Sets whether Kerberos and GSSAPI user names should be treated as case-insensitive.</td>
  </tr>
  <tr valign="top">
    <td align="left">krb_server_keyfile</td>
    <td align="left">FILE:/usr/local/etc/postgresql/krb5.keytab</td>
    <td align="left">Sets the location of the Kerberos server key file.</td>
  </tr>
  <tr valign="top">
    <td align="left">lc_collate</td>
    <td align="left">en_US.UTF-8</td>
    <td align="left">Shows the collation order locale.</td>
  </tr>
  <tr valign="top">
    <td align="left">lc_ctype</td>
    <td align="left">en_US.UTF-8</td>
    <td align="left">Shows the character classification and case conversion locale.</td>
  </tr>
  <tr valign="top">
    <td align="left">lc_messages</td>
    <td align="left">en_US.UTF-8</td>
    <td align="left">Sets the language in which messages are displayed.</td>
  </tr>
  <tr valign="top">
    <td align="left">lc_monetary</td>
    <td align="left">en_US.UTF-8</td>
    <td align="left">Sets the locale for formatting monetary amounts.</td>
  </tr>
  <tr valign="top">
    <td align="left">lc_numeric</td>
    <td align="left">en_US.UTF-8</td>
    <td align="left">Sets the locale for formatting numbers.</td>
  </tr>
  <tr valign="top">
    <td align="left">lc_time</td>
    <td align="left">en_US.UTF-8</td>
    <td align="left">Sets the locale for formatting date and time values.</td>
  </tr>
  <tr valign="top">
    <td align="left">listen_addresses</td>
    <td align="left">localhost</td>
    <td align="left">Sets the host name or IP address(es) to listen to.</td>
  </tr>
  <tr valign="top">
    <td align="left">lo_compat_privileges</td>
    <td align="left">off</td>
    <td align="left">Enables backward compatibility mode for privilege checks on large objects.</td>
  </tr>
  <tr valign="top">
    <td align="left">local_preload_libraries</td>
    <td align="left">&nbsp; </td>
    <td align="left">Lists unprivileged shared libraries to preload into each backend.</td>
  </tr>
  <tr valign="top">
    <td align="left">lock_timeout</td>
    <td align="left">0</td>
    <td align="left">Sets the maximum allowed duration of any wait for a lock.</td>
  </tr>
  <tr valign="top">
    <td align="left">log_autovacuum_min_duration</td>
    <td align="left">-1</td>
    <td align="left">Sets the minimum execution time above which autovacuum actions will be logged.</td>
  </tr>
  <tr valign="top">
    <td align="left">log_checkpoints</td>
    <td align="left">off</td>
    <td align="left">Logs each checkpoint.</td>
  </tr>
  <tr valign="top">
    <td align="left">log_connections</td>
    <td align="left">off</td>
    <td align="left">Logs each successful connection.</td>
  </tr>
  <tr valign="top">
    <td align="left">log_destination</td>
    <td align="left">stderr</td>
    <td align="left">Sets the destination for server log output.</td>
  </tr>
  <tr valign="top">
    <td align="left">log_directory</td>
    <td align="left">log</td>
    <td align="left">Sets the destination directory for log files.</td>
  </tr>
  <tr valign="top">
    <td align="left">log_disconnections</td>
    <td align="left">off</td>
    <td align="left">Logs end of a session, including duration.</td>
  </tr>
  <tr valign="top">
    <td align="left">log_duration</td>
    <td align="left">off</td>
    <td align="left">Logs the duration of each completed SQL statement.</td>
  </tr>
  <tr valign="top">
    <td align="left">log_error_verbosity</td>
    <td align="left">default</td>
    <td align="left">Sets the verbosity of logged messages.</td>
  </tr>
  <tr valign="top">
    <td align="left">log_executor_stats</td>
    <td align="left">off</td>
    <td align="left">Writes executor performance statistics to the server log.</td>
  </tr>
  <tr valign="top">
    <td align="left">log_file_mode</td>
    <td align="left">0600</td>
    <td align="left">Sets the file permissions for log files.</td>
  </tr>
  <tr valign="top">
    <td align="left">log_filename</td>
    <td align="left">postgresql-%Y-%m-%d_%H%M%S.log</td>
    <td align="left">Sets the file name pattern for log files.</td>
  </tr>
  <tr valign="top">
    <td align="left">log_hostname</td>
    <td align="left">off</td>
    <td align="left">Logs the host name in the connection logs.</td>
  </tr>
  <tr valign="top">
    <td align="left">log_line_prefix</td>
    <td align="left">%m [%p] </td>
    <td align="left">Controls information prefixed to each log line.</td>
  </tr>
  <tr valign="top">
    <td align="left">log_lock_waits</td>
    <td align="left">off</td>
    <td align="left">Logs long lock waits.</td>
  </tr>
  <tr valign="top">
    <td align="left">log_min_duration_statement</td>
    <td align="left">-1</td>
    <td align="left">Sets the minimum execution time above which statements will be logged.</td>
  </tr>
  <tr valign="top">
    <td align="left">log_min_error_statement</td>
    <td align="left">error</td>
    <td align="left">Causes all statements generating error at or above this level to be logged.</td>
  </tr>
  <tr valign="top">
    <td align="left">log_min_messages</td>
    <td align="left">warning</td>
    <td align="left">Sets the message levels that are logged.</td>
  </tr>
  <tr valign="top">
    <td align="left">log_parser_stats</td>
    <td align="left">off</td>
    <td align="left">Writes parser performance statistics to the server log.</td>
  </tr>
  <tr valign="top">
    <td align="left">log_planner_stats</td>
    <td align="left">off</td>
    <td align="left">Writes planner performance statistics to the server log.</td>
  </tr>
  <tr valign="top">
    <td align="left">log_replication_commands</td>
    <td align="left">off</td>
    <td align="left">Logs each replication command.</td>
  </tr>
  <tr valign="top">
    <td align="left">log_rotation_age</td>
    <td align="left">1440</td>
    <td align="left">Automatic log file rotation will occur after N minutes.</td>
  </tr>
  <tr valign="top">
    <td align="left">log_rotation_size</td>
    <td align="left">10240</td>
    <td align="left">Automatic log file rotation will occur after N kilobytes.</td>
  </tr>
  <tr valign="top">
    <td align="left">log_statement</td>
    <td align="left">none</td>
    <td align="left">Sets the type of statements logged.</td>
  </tr>
  <tr valign="top">
    <td align="left">log_statement_stats</td>
    <td align="left">off</td>
    <td align="left">Writes cumulative performance statistics to the server log.</td>
  </tr>
  <tr valign="top">
    <td align="left">log_temp_files</td>
    <td align="left">-1</td>
    <td align="left">Log the use of temporary files larger than this number of kilobytes.</td>
  </tr>
  <tr valign="top">
    <td align="left">log_timezone</td>
    <td align="left">US/Eastern</td>
    <td align="left">Sets the time zone to use in log messages.</td>
  </tr>
  <tr valign="top">
    <td align="left">log_truncate_on_rotation</td>
    <td align="left">off</td>
    <td align="left">Truncate existing log files of same name during log rotation.</td>
  </tr>
  <tr valign="top">
    <td align="left">logging_collector</td>
    <td align="left">off</td>
    <td align="left">Start a subprocess to capture stderr output and/or csvlogs into log files.</td>
  </tr>
  <tr valign="top">
    <td align="left">maintenance_work_mem</td>
    <td align="left">65536</td>
    <td align="left">Sets the maximum memory to be used for maintenance operations.</td>
  </tr>
  <tr valign="top">
    <td align="left">max_connections</td>
    <td align="left">100</td>
    <td align="left">Sets the maximum number of concurrent connections.</td>
  </tr>
  <tr valign="top">
    <td align="left">max_files_per_process</td>
    <td align="left">1000</td>
    <td align="left">Sets the maximum number of simultaneously open files for each server process.</td>
  </tr>
  <tr valign="top">
    <td align="left">max_function_args</td>
    <td align="left">100</td>
    <td align="left">Shows the maximum number of function arguments.</td>
  </tr>
  <tr valign="top">
    <td align="left">max_identifier_length</td>
    <td align="left">63</td>
    <td align="left">Shows the maximum identifier length.</td>
  </tr>
  <tr valign="top">
    <td align="left">max_index_keys</td>
    <td align="left">32</td>
    <td align="left">Shows the maximum number of index keys.</td>
  </tr>
  <tr valign="top">
    <td align="left">max_locks_per_transaction</td>
    <td align="left">64</td>
    <td align="left">Sets the maximum number of locks per transaction.</td>
  </tr>
  <tr valign="top">
    <td align="left">max_logical_replication_workers</td>
    <td align="left">4</td>
    <td align="left">Maximum number of logical replication worker processes.</td>
  </tr>
  <tr valign="top">
    <td align="left">max_parallel_maintenance_workers</td>
    <td align="left">2</td>
    <td align="left">Sets the maximum number of parallel processes per maintenance operation.</td>
  </tr>
  <tr valign="top">
    <td align="left">max_parallel_workers</td>
    <td align="left">8</td>
    <td align="left">Sets the maximum number of parallel workers that can be active at one time.</td>
  </tr>
  <tr valign="top">
    <td align="left">max_parallel_workers_per_gather</td>
    <td align="left">2</td>
    <td align="left">Sets the maximum number of parallel processes per executor node.</td>
  </tr>
  <tr valign="top">
    <td align="left">max_pred_locks_per_page</td>
    <td align="left">2</td>
    <td align="left">Sets the maximum number of predicate-locked tuples per page.</td>
  </tr>
  <tr valign="top">
    <td align="left">max_pred_locks_per_relation</td>
    <td align="left">-2</td>
    <td align="left">Sets the maximum number of predicate-locked pages and tuples per relation.</td>
  </tr>
  <tr valign="top">
    <td align="left">max_pred_locks_per_transaction</td>
    <td align="left">64</td>
    <td align="left">Sets the maximum number of predicate locks per transaction.</td>
  </tr>
  <tr valign="top">
    <td align="left">max_prepared_transactions</td>
    <td align="left">0</td>
    <td align="left">Sets the maximum number of simultaneously prepared transactions.</td>
  </tr>
  <tr valign="top">
    <td align="left">max_replication_slots</td>
    <td align="left">10</td>
    <td align="left">Sets the maximum number of simultaneously defined replication slots.</td>
  </tr>
  <tr valign="top">
    <td align="left">max_stack_depth</td>
    <td align="left">2048</td>
    <td align="left">Sets the maximum stack depth, in kilobytes.</td>
  </tr>
  <tr valign="top">
    <td align="left">max_standby_archive_delay</td>
    <td align="left">30000</td>
    <td align="left">Sets the maximum delay before canceling queries when a hot standby server is processing archived WAL data.</td>
  </tr>
  <tr valign="top">
    <td align="left">max_standby_streaming_delay</td>
    <td align="left">30000</td>
    <td align="left">Sets the maximum delay before canceling queries when a hot standby server is processing streamed WAL data.</td>
  </tr>
  <tr valign="top">
    <td align="left">max_sync_workers_per_subscription</td>
    <td align="left">2</td>
    <td align="left">Maximum number of table synchronization workers per subscription.</td>
  </tr>
  <tr valign="top">
    <td align="left">max_wal_senders</td>
    <td align="left">10</td>
    <td align="left">Sets the maximum number of simultaneously running WAL sender processes.</td>
  </tr>
  <tr valign="top">
    <td align="left">max_wal_size</td>
    <td align="left">1024</td>
    <td align="left">Sets the WAL size that triggers a checkpoint.</td>
  </tr>
  <tr valign="top">
    <td align="left">max_worker_processes</td>
    <td align="left">8</td>
    <td align="left">Maximum number of concurrent worker processes.</td>
  </tr>
  <tr valign="top">
    <td align="left">min_parallel_index_scan_size</td>
    <td align="left">64</td>
    <td align="left">Sets the minimum amount of index data for a parallel scan.</td>
  </tr>
  <tr valign="top">
    <td align="left">min_parallel_table_scan_size</td>
    <td align="left">1024</td>
    <td align="left">Sets the minimum amount of table data for a parallel scan.</td>
  </tr>
  <tr valign="top">
    <td align="left">min_wal_size</td>
    <td align="left">80</td>
    <td align="left">Sets the minimum size to shrink the WAL to.</td>
  </tr>
  <tr valign="top">
    <td align="left">old_snapshot_threshold</td>
    <td align="left">-1</td>
    <td align="left">Time before a snapshot is too old to read pages changed after the snapshot was taken.</td>
  </tr>
  <tr valign="top">
    <td align="left">operator_precedence_warning</td>
    <td align="left">off</td>
    <td align="left">Emit a warning for constructs that changed meaning since PostgreSQL 9.4.</td>
  </tr>
  <tr valign="top">
    <td align="left">parallel_leader_participation</td>
    <td align="left">on</td>
    <td align="left">Controls whether Gather and Gather Merge also run subplans.</td>
  </tr>
  <tr valign="top">
    <td align="left">parallel_setup_cost</td>
    <td align="left">1000</td>
    <td align="left">Sets the planner's estimate of the cost of starting up worker processes for parallel query.</td>
  </tr>
  <tr valign="top">
    <td align="left">parallel_tuple_cost</td>
    <td align="left">0.1</td>
    <td align="left">Sets the planner's estimate of the cost of passing each tuple (row) from worker to master backend.</td>
  </tr>
  <tr valign="top">
    <td align="left">password_encryption</td>
    <td align="left">md5</td>
    <td align="left">Encrypt passwords.</td>
  </tr>
  <tr valign="top">
    <td align="left">port</td>
    <td align="left">5432</td>
    <td align="left">Sets the TCP port the server listens on.</td>
  </tr>
  <tr valign="top">
    <td align="left">post_auth_delay</td>
    <td align="left">0</td>
    <td align="left">Waits N seconds on connection startup after authentication.</td>
  </tr>
  <tr valign="top">
    <td align="left">pre_auth_delay</td>
    <td align="left">0</td>
    <td align="left">Waits N seconds on connection startup before authentication.</td>
  </tr>
  <tr valign="top">
    <td align="left">quote_all_identifiers</td>
    <td align="left">off</td>
    <td align="left">When generating SQL fragments, quote all identifiers.</td>
  </tr>
  <tr valign="top">
    <td align="left">random_page_cost</td>
    <td align="left">4</td>
    <td align="left">Sets the planner's estimate of the cost of a nonsequentially fetched disk page.</td>
  </tr>
  <tr valign="top">
    <td align="left">restart_after_crash</td>
    <td align="left">on</td>
    <td align="left">Reinitialize server after backend crash.</td>
  </tr>
  <tr valign="top">
    <td align="left">row_security</td>
    <td align="left">on</td>
    <td align="left">Enable row security.</td>
  </tr>
  <tr valign="top">
    <td align="left">search_path</td>
    <td align="left">&quot;$user&quot;, public</td>
    <td align="left">Sets the schema search order for names that are not schema-qualified.</td>
  </tr>
  <tr valign="top">
    <td align="left">segment_size</td>
    <td align="left">131072</td>
    <td align="left">Shows the number of pages per disk file.</td>
  </tr>
  <tr valign="top">
    <td align="left">seq_page_cost</td>
    <td align="left">1</td>
    <td align="left">Sets the planner's estimate of the cost of a sequentially fetched disk page.</td>
  </tr>
  <tr valign="top">
    <td align="left">server_encoding</td>
    <td align="left">UTF8</td>
    <td align="left">Sets the server (database) character set encoding.</td>
  </tr>
  <tr valign="top">
    <td align="left">server_version</td>
    <td align="left">11.1</td>
    <td align="left">Shows the server version.</td>
  </tr>
  <tr valign="top">
    <td align="left">server_version_num</td>
    <td align="left">110001</td>
    <td align="left">Shows the server version as an integer.</td>
  </tr>
  <tr valign="top">
    <td align="left">session_preload_libraries</td>
    <td align="left">&nbsp; </td>
    <td align="left">Lists shared libraries to preload into each backend.</td>
  </tr>
  <tr valign="top">
    <td align="left">session_replication_role</td>
    <td align="left">origin</td>
    <td align="left">Sets the session's behavior for triggers and rewrite rules.</td>
  </tr>
  <tr valign="top">
    <td align="left">shared_buffers</td>
    <td align="left">16384</td>
    <td align="left">Sets the number of shared memory buffers used by the server.</td>
  </tr>
  <tr valign="top">
    <td align="left">shared_preload_libraries</td>
    <td align="left">&nbsp; </td>
    <td align="left">Lists shared libraries to preload into server.</td>
  </tr>
  <tr valign="top">
    <td align="left">ssl</td>
    <td align="left">off</td>
    <td align="left">Enables SSL connections.</td>
  </tr>
  <tr valign="top">
    <td align="left">ssl_ca_file</td>
    <td align="left">&nbsp; </td>
    <td align="left">Location of the SSL certificate authority file.</td>
  </tr>
  <tr valign="top">
    <td align="left">ssl_cert_file</td>
    <td align="left">server.crt</td>
    <td align="left">Location of the SSL server certificate file.</td>
  </tr>
  <tr valign="top">
    <td align="left">ssl_ciphers</td>
    <td align="left">HIGH:MEDIUM:+3DES:!aNULL</td>
    <td align="left">Sets the list of allowed SSL ciphers.</td>
  </tr>
  <tr valign="top">
    <td align="left">ssl_crl_file</td>
    <td align="left">&nbsp; </td>
    <td align="left">Location of the SSL certificate revocation list file.</td>
  </tr>
  <tr valign="top">
    <td align="left">ssl_dh_params_file</td>
    <td align="left">&nbsp; </td>
    <td align="left">Location of the SSL DH parameters file.</td>
  </tr>
  <tr valign="top">
    <td align="left">ssl_ecdh_curve</td>
    <td align="left">prime256v1</td>
    <td align="left">Sets the curve to use for ECDH.</td>
  </tr>
  <tr valign="top">
    <td align="left">ssl_key_file</td>
    <td align="left">server.key</td>
    <td align="left">Location of the SSL server private key file.</td>
  </tr>
  <tr valign="top">
    <td align="left">ssl_passphrase_command</td>
    <td align="left">&nbsp; </td>
    <td align="left">Command to obtain passphrases for SSL.</td>
  </tr>
  <tr valign="top">
    <td align="left">ssl_passphrase_command_supports_reload</td>
    <td align="left">off</td>
    <td align="left">Also use ssl_passphrase_command during server reload.</td>
  </tr>
  <tr valign="top">
    <td align="left">ssl_prefer_server_ciphers</td>
    <td align="left">on</td>
    <td align="left">Give priority to server ciphersuite order.</td>
  </tr>
  <tr valign="top">
    <td align="left">standard_conforming_strings</td>
    <td align="left">on</td>
    <td align="left">Causes '...' strings to treat backslashes literally.</td>
  </tr>
  <tr valign="top">
    <td align="left">statement_timeout</td>
    <td align="left">0</td>
    <td align="left">Sets the maximum allowed duration of any statement.</td>
  </tr>
  <tr valign="top">
    <td align="left">stats_temp_directory</td>
    <td align="left">pg_stat_tmp</td>
    <td align="left">Writes temporary statistics files to the specified directory.</td>
  </tr>
  <tr valign="top">
    <td align="left">superuser_reserved_connections</td>
    <td align="left">3</td>
    <td align="left">Sets the number of connection slots reserved for superusers.</td>
  </tr>
  <tr valign="top">
    <td align="left">synchronize_seqscans</td>
    <td align="left">on</td>
    <td align="left">Enable synchronized sequential scans.</td>
  </tr>
  <tr valign="top">
    <td align="left">synchronous_commit</td>
    <td align="left">on</td>
    <td align="left">Sets the current transaction's synchronization level.</td>
  </tr>
  <tr valign="top">
    <td align="left">synchronous_standby_names</td>
    <td align="left">&nbsp; </td>
    <td align="left">Number of synchronous standbys and list of names of potential synchronous ones.</td>
  </tr>
  <tr valign="top">
    <td align="left">syslog_facility</td>
    <td align="left">local0</td>
    <td align="left">Sets the syslog &quot;facility&quot; to be used when syslog enabled.</td>
  </tr>
  <tr valign="top">
    <td align="left">syslog_ident</td>
    <td align="left">postgres</td>
    <td align="left">Sets the program name used to identify PostgreSQL messages in syslog.</td>
  </tr>
  <tr valign="top">
    <td align="left">syslog_sequence_numbers</td>
    <td align="left">on</td>
    <td align="left">Add sequence number to syslog messages to avoid duplicate suppression.</td>
  </tr>
  <tr valign="top">
    <td align="left">syslog_split_messages</td>
    <td align="left">on</td>
    <td align="left">Split messages sent to syslog by lines and to fit into 1024 bytes.</td>
  </tr>
  <tr valign="top">
    <td align="left">tcp_keepalives_count</td>
    <td align="left">0</td>
    <td align="left">Maximum number of TCP keepalive retransmits.</td>
  </tr>
  <tr valign="top">
    <td align="left">tcp_keepalives_idle</td>
    <td align="left">0</td>
    <td align="left">Time between issuing TCP keepalives.</td>
  </tr>
  <tr valign="top">
    <td align="left">tcp_keepalives_interval</td>
    <td align="left">0</td>
    <td align="left">Time between TCP keepalive retransmits.</td>
  </tr>
  <tr valign="top">
    <td align="left">temp_buffers</td>
    <td align="left">1024</td>
    <td align="left">Sets the maximum number of temporary buffers used by each session.</td>
  </tr>
  <tr valign="top">
    <td align="left">temp_file_limit</td>
    <td align="left">-1</td>
    <td align="left">Limits the total size of all temporary files used by each process.</td>
  </tr>
  <tr valign="top">
    <td align="left">temp_tablespaces</td>
    <td align="left">&nbsp; </td>
    <td align="left">Sets the tablespace(s) to use for temporary tables and sort files.</td>
  </tr>
  <tr valign="top">
    <td align="left">TimeZone</td>
    <td align="left">US/Eastern</td>
    <td align="left">Sets the time zone for displaying and interpreting time stamps.</td>
  </tr>
  <tr valign="top">
    <td align="left">timezone_abbreviations</td>
    <td align="left">Default</td>
    <td align="left">Selects a file of time zone abbreviations.</td>
  </tr>
  <tr valign="top">
    <td align="left">trace_notify</td>
    <td align="left">off</td>
    <td align="left">Generates debugging output for LISTEN and NOTIFY.</td>
  </tr>
  <tr valign="top">
    <td align="left">trace_recovery_messages</td>
    <td align="left">log</td>
    <td align="left">Enables logging of recovery-related debugging information.</td>
  </tr>
  <tr valign="top">
    <td align="left">trace_sort</td>
    <td align="left">off</td>
    <td align="left">Emit information about resource usage in sorting.</td>
  </tr>
  <tr valign="top">
    <td align="left">track_activities</td>
    <td align="left">on</td>
    <td align="left">Collects information about executing commands.</td>
  </tr>
  <tr valign="top">
    <td align="left">track_activity_query_size</td>
    <td align="left">1024</td>
    <td align="left">Sets the size reserved for pg_stat_activity.query, in bytes.</td>
  </tr>
  <tr valign="top">
    <td align="left">track_commit_timestamp</td>
    <td align="left">off</td>
    <td align="left">Collects transaction commit time.</td>
  </tr>
  <tr valign="top">
    <td align="left">track_counts</td>
    <td align="left">on</td>
    <td align="left">Collects statistics on database activity.</td>
  </tr>
  <tr valign="top">
    <td align="left">track_functions</td>
    <td align="left">none</td>
    <td align="left">Collects function-level statistics on database activity.</td>
  </tr>
  <tr valign="top">
    <td align="left">track_io_timing</td>
    <td align="left">off</td>
    <td align="left">Collects timing statistics for database I/O activity.</td>
  </tr>
  <tr valign="top">
    <td align="left">transaction_deferrable</td>
    <td align="left">off</td>
    <td align="left">Whether to defer a read-only serializable transaction until it can be executed with no possible serialization failures.</td>
  </tr>
  <tr valign="top">
    <td align="left">transaction_isolation</td>
    <td align="left">read committed</td>
    <td align="left">Sets the current transaction's isolation level.</td>
  </tr>
  <tr valign="top">
    <td align="left">transaction_read_only</td>
    <td align="left">off</td>
    <td align="left">Sets the current transaction's read-only status.</td>
  </tr>
  <tr valign="top">
    <td align="left">transform_null_equals</td>
    <td align="left">off</td>
    <td align="left">Treats &quot;expr=NULL&quot; as &quot;expr IS NULL&quot;.</td>
  </tr>
  <tr valign="top">
    <td align="left">unix_socket_directories</td>
    <td align="left">/tmp</td>
    <td align="left">Sets the directories where Unix-domain sockets will be created.</td>
  </tr>
  <tr valign="top">
    <td align="left">unix_socket_group</td>
    <td align="left">&nbsp; </td>
    <td align="left">Sets the owning group of the Unix-domain socket.</td>
  </tr>
  <tr valign="top">
    <td align="left">unix_socket_permissions</td>
    <td align="left">0777</td>
    <td align="left">Sets the access permissions of the Unix-domain socket.</td>
  </tr>
  <tr valign="top">
    <td align="left">update_process_title</td>
    <td align="left">on</td>
    <td align="left">Updates the process title to show the active SQL command.</td>
  </tr>
  <tr valign="top">
    <td align="left">vacuum_cleanup_index_scale_factor</td>
    <td align="left">0.1</td>
    <td align="left">Number of tuple inserts prior to index cleanup as a fraction of reltuples.</td>
  </tr>
  <tr valign="top">
    <td align="left">vacuum_cost_delay</td>
    <td align="left">0</td>
    <td align="left">Vacuum cost delay in milliseconds.</td>
  </tr>
  <tr valign="top">
    <td align="left">vacuum_cost_limit</td>
    <td align="left">200</td>
    <td align="left">Vacuum cost amount available before napping.</td>
  </tr>
  <tr valign="top">
    <td align="left">vacuum_cost_page_dirty</td>
    <td align="left">20</td>
    <td align="left">Vacuum cost for a page dirtied by vacuum.</td>
  </tr>
  <tr valign="top">
    <td align="left">vacuum_cost_page_hit</td>
    <td align="left">1</td>
    <td align="left">Vacuum cost for a page found in the buffer cache.</td>
  </tr>
  <tr valign="top">
    <td align="left">vacuum_cost_page_miss</td>
    <td align="left">10</td>
    <td align="left">Vacuum cost for a page not found in the buffer cache.</td>
  </tr>
  <tr valign="top">
    <td align="left">vacuum_defer_cleanup_age</td>
    <td align="left">0</td>
    <td align="left">Number of transactions by which VACUUM and HOT cleanup should be deferred, if any.</td>
  </tr>
  <tr valign="top">
    <td align="left">vacuum_freeze_min_age</td>
    <td align="left">50000000</td>
    <td align="left">Minimum age at which VACUUM should freeze a table row.</td>
  </tr>
  <tr valign="top">
    <td align="left">vacuum_freeze_table_age</td>
    <td align="left">150000000</td>
    <td align="left">Age at which VACUUM should scan whole table to freeze tuples.</td>
  </tr>
  <tr valign="top">
    <td align="left">vacuum_multixact_freeze_min_age</td>
    <td align="left">5000000</td>
    <td align="left">Minimum age at which VACUUM should freeze a MultiXactId in a table row.</td>
  </tr>
  <tr valign="top">
    <td align="left">vacuum_multixact_freeze_table_age</td>
    <td align="left">150000000</td>
    <td align="left">Multixact age at which VACUUM should scan whole table to freeze tuples.</td>
  </tr>
  <tr valign="top">
    <td align="left">wal_block_size</td>
    <td align="left">8192</td>
    <td align="left">Shows the block size in the write ahead log.</td>
  </tr>
  <tr valign="top">
    <td align="left">wal_buffers</td>
    <td align="left">512</td>
    <td align="left">Sets the number of disk-page buffers in shared memory for WAL.</td>
  </tr>
  <tr valign="top">
    <td align="left">wal_compression</td>
    <td align="left">off</td>
    <td align="left">Compresses full-page writes written in WAL file.</td>
  </tr>
  <tr valign="top">
    <td align="left">wal_consistency_checking</td>
    <td align="left">&nbsp; </td>
    <td align="left">Sets the WAL resource managers for which WAL consistency checks are done.</td>
  </tr>
  <tr valign="top">
    <td align="left">wal_keep_segments</td>
    <td align="left">0</td>
    <td align="left">Sets the number of WAL files held for standby servers.</td>
  </tr>
  <tr valign="top">
    <td align="left">wal_level</td>
    <td align="left">replica</td>
    <td align="left">Set the level of information written to the WAL.</td>
  </tr>
  <tr valign="top">
    <td align="left">wal_log_hints</td>
    <td align="left">off</td>
    <td align="left">Writes full pages to WAL when first modified after a checkpoint, even for a non-critical modifications.</td>
  </tr>
  <tr valign="top">
    <td align="left">wal_receiver_status_interval</td>
    <td align="left">10</td>
    <td align="left">Sets the maximum interval between WAL receiver status reports to the primary.</td>
  </tr>
  <tr valign="top">
    <td align="left">wal_receiver_timeout</td>
    <td align="left">60000</td>
    <td align="left">Sets the maximum wait time to receive data from the primary.</td>
  </tr>
  <tr valign="top">
    <td align="left">wal_retrieve_retry_interval</td>
    <td align="left">5000</td>
    <td align="left">Sets the time to wait before retrying to retrieve WAL after a failed attempt.</td>
  </tr>
  <tr valign="top">
    <td align="left">wal_segment_size</td>
    <td align="left">16777216</td>
    <td align="left">Shows the size of write ahead log segments.</td>
  </tr>
  <tr valign="top">
    <td align="left">wal_sender_timeout</td>
    <td align="left">60000</td>
    <td align="left">Sets the maximum time to wait for WAL replication.</td>
  </tr>
  <tr valign="top">
    <td align="left">wal_sync_method</td>
    <td align="left">open_datasync</td>
    <td align="left">Selects the method used for forcing WAL updates to disk.</td>
  </tr>
  <tr valign="top">
    <td align="left">wal_writer_delay</td>
    <td align="left">200</td>
    <td align="left">Time between WAL flushes performed in the WAL writer.</td>
  </tr>
  <tr valign="top">
    <td align="left">wal_writer_flush_after</td>
    <td align="left">128</td>
    <td align="left">Amount of WAL written out by WAL writer that triggers a flush.</td>
  </tr>
  <tr valign="top">
    <td align="left">work_mem</td>
    <td align="left">4096</td>
    <td align="left">Sets the maximum memory to be used for query workspaces.</td>
  </tr>
  <tr valign="top">
    <td align="left">xmlbinary</td>
    <td align="left">base64</td>
    <td align="left">Sets how binary values are to be encoded in XML.</td>
  </tr>
  <tr valign="top">
    <td align="left">xmloption</td>
    <td align="left">content</td>
    <td align="left">Sets whether XML data in implicit parsing and serialization operations is to be considered as documents or content fragments.</td>
  </tr>
  <tr valign="top">
    <td align="left">zero_damaged_pages</td>
    <td align="left">off</td>
    <td align="left">Continues processing past damaged page headers.</td>
  </tr>
</table>
<p>(289 rows)<br />
</p>
Time: 2.382 ms