# -----------------------------
# PostgreSQL configuration file
# -----------------------------
#
# This file consists of lines of the form:
#
#   name = value
#
# (The "=" is optional.)  Whitespace may be used.  Comments are introduced with
# "#" anywhere on a line.  The complete list of parameter names and allowed
# values can be found in the PostgreSQL documentation.
#
# The commented-out settings shown in this file represent the default values.
# Re-commenting a setting is NOT sufficient to revert it to the default value;
# you need to reload the server.
#
# This file is read on server startup and when the server receives a SIGHUP
# signal.  If you edit the file on a running system, you have to SIGHUP the
# server for the changes to take effect, run "pg_ctl reload", or execute
# "SELECT pg_reload_conf()".  Some parameters, which are marked below,
# require a server shutdown and restart to take effect.
#
# Any parameter can also be given as a command-line option to the server, e.g.,
# "postgres -c log_connections=on".  Some parameters can be changed at run time
# with the "SET" SQL command.
#
# Memory units:  kB = kilobytes        Time units:  ms  = milliseconds
#                MB = megabytes                     s   = seconds
#                GB = gigabytes                     min = minutes
#                TB = terabytes                     h   = hours
#                                                   d   = days


#------------------------------------------------------------------------------
# FILE LOCATIONS
#------------------------------------------------------------------------------

# The default values of these variables are driven from the -D command-line
# option or PGDATA environment variable, represented here as ConfigDir.

#data_directory = 'ConfigDir'           # use data in another directory
                                        # (change requires restart)
#hba_file = 'ConfigDir/pg_hba.conf'     # host-based authentication file
                                        # (change requires restart)
#ident_file = 'ConfigDir/pg_ident.conf' # ident configuration file
                                        # (change requires restart)

# If external_pid_file is not explicitly set, no extra PID file is written.
#external_pid_file = ''                 # write an extra PID file
                                        # (change requires restart)


#------------------------------------------------------------------------------
# CONNECTIONS AND AUTHENTICATION
#------------------------------------------------------------------------------

# - Connection Settings -

#listen_addresses = 'localhost'         # what IP address(es) to listen on;
                                        # comma-separated list of addresses;
                                        # defaults to 'localhost'; use '*' for all
                                        # (change requires restart)
#port = 5432                            # (change requires restart)
#max_connections = 100                  # (change requires restart)
#superuser_reserved_connections = 3     # (change requires restart)
#unix_socket_directories = '/tmp'       # comma-separated list of directories
                                        # (change requires restart)
#unix_socket_group = ''                 # (change requires restart)
#unix_socket_permissions = 0777         # begin with 0 to use octal notation
                                        # (change requires restart)
#bonjour = off                          # advertise server via Bonjour
                                        # (change requires restart)
#bonjour_name = ''                      # defaults to the computer name
                                        # (change requires restart)

# - Security and Authentication -

#authentication_timeout = 1min          # 1s-600s
#ssl = off
#ssl_ciphers = 'HIGH:MEDIUM:+3DES:!aNULL' # allowed SSL ciphers
#ssl_prefer_server_ciphers = on
#ssl_ecdh_curve = 'prime256v1'
#ssl_dh_params_file = ''
#ssl_cert_file = 'server.crt'
#ssl_key_file = 'server.key'
#ssl_ca_file = ''
#ssl_crl_file = ''
#password_encryption = md5              # md5 or scram-sha-256
#db_user_namespace = off
#row_security = on

# GSSAPI using Kerberos
#krb_server_keyfile = ''
#krb_caseins_users = off

# - TCP Keepalives -
# see "man 7 tcp" for details

#tcp_keepalives_idle = 0                # TCP_KEEPIDLE, in seconds;
                                        # 0 selects the system default
#tcp_keepalives_interval = 0            # TCP_KEEPINTVL, in seconds;
                                        # 0 selects the system default
#tcp_keepalives_count = 0               # TCP_KEEPCNT;
                                        # 0 selects the system default


#------------------------------------------------------------------------------
# RESOURCE USAGE (except WAL)
#------------------------------------------------------------------------------

# - Memory -

#shared_buffers = 32MB                  # min 128kB
                                        # (change requires restart)
#huge_pages = try                       # on, off, or try
                                        # (change requires restart)
#temp_buffers = 8MB                     # min 800kB
#max_prepared_transactions = 0          # zero disables the feature
                                        # (change requires restart)
# Caution: it is not advisable to set max_prepared_transactions nonzero unless
# you actively intend to use prepared transactions.
#work_mem = 4MB                         # min 64kB
#maintenance_work_mem = 64MB            # min 1MB
#replacement_sort_tuples = 150000       # limits use of replacement selection sort
#autovacuum_work_mem = -1               # min 1MB, or -1 to use maintenance_work_mem
#max_stack_depth = 2MB                  # min 100kB
#dynamic_shared_memory_type = posix     # the default is the first option
                                        # supported by the operating system:
                                        #   posix
                                        #   sysv
                                        #   windows
                                        #   mmap
                                        # use none to disable dynamic shared memory
                                        # (change requires restart)

# - Disk -

#temp_file_limit = -1                   # limits per-process temp file space
                                        # in kB, or -1 for no limit

# - Kernel Resource Usage -

#max_files_per_process = 1000           # min 25
                                        # (change requires restart)
#shared_preload_libraries = ''          # (change requires restart)

# - Cost-Based Vacuum Delay -

#vacuum_cost_delay = 0                  # 0-100 milliseconds
#vacuum_cost_page_hit = 1               # 0-10000 credits
#vacuum_cost_page_miss = 10             # 0-10000 credits
#vacuum_cost_page_dirty = 20            # 0-10000 credits
#vacuum_cost_limit = 200                # 1-10000 credits

# - Background Writer -

#bgwriter_delay = 200ms                 # 10-10000ms between rounds
#bgwriter_lru_maxpages = 100            # 0-1000 max buffers written/round
#bgwriter_lru_multiplier = 2.0          # 0-10.0 multiplier on buffers scanned/round
#bgwriter_flush_after = 0               # measured in pages, 0 disables

# - Asynchronous Behavior -

#effective_io_concurrency = 1           # 1-1000; 0 disables prefetching
#max_worker_processes = 8               # (change requires restart)
#max_parallel_workers_per_gather = 2    # taken from max_parallel_workers
#max_parallel_workers = 8               # maximum number of max_worker_processes that
                                        # can be used in parallel queries
#old_snapshot_threshold = -1            # 1min-60d; -1 disables; 0 is immediate
                                        # (change requires restart)
#backend_flush_after = 0                # measured in pages, 0 disables


#------------------------------------------------------------------------------
# WRITE AHEAD LOG
#------------------------------------------------------------------------------

# - Settings -

#wal_level = replica                    # minimal, replica, or logical
                                        # (change requires restart)
#fsync = on                             # flush data to disk for crash safety
                                        # (turning this off can cause
                                        # unrecoverable data corruption)
#synchronous_commit = on                # synchronization level;
                                        # off, local, remote_write, remote_apply, or on
#wal_sync_method = fsync                # the default is the first option
                                        # supported by the operating system:
                                        #   open_datasync
                                        #   fdatasync (default on Linux)
                                        #   fsync
                                        #   fsync_writethrough
                                        #   open_sync
#full_page_writes = on                  # recover from partial page writes
#wal_compression = off                  # enable compression of full-page writes
#wal_log_hints = off                    # also do full page writes of non-critical updates
                                        # (change requires restart)
#wal_buffers = -1                       # min 32kB, -1 sets based on shared_buffers
                                        # (change requires restart)
#wal_writer_delay = 200ms               # 1-10000 milliseconds
#wal_writer_flush_after = 1MB           # measured in pages, 0 disables

#commit_delay = 0                       # range 0-100000, in microseconds
#commit_siblings = 5                    # range 1-1000

# - Checkpoints -

#checkpoint_timeout = 5min              # range 30s-1d
#max_wal_size = 1GB
#min_wal_size = 80MB
#checkpoint_completion_target = 0.5     # checkpoint target duration, 0.0 - 1.0
#checkpoint_flush_after = 0             # measured in pages, 0 disables
#checkpoint_warning = 30s               # 0 disables

# - Archiving -

#archive_mode = off             # enables archiving; off, on, or always
                                # (change requires restart)
#archive_command = ''           # command to use to archive a logfile segment
                                # placeholders: %p = path of file to archive
                                #               %f = file name only
                                # e.g. 'test ! -f /mnt/server/archivedir/%f && cp %p /mnt/server/archivedir/%f'
#archive_timeout = 0            # force a logfile segment switch after this
                                # number of seconds; 0 disables


#------------------------------------------------------------------------------
# REPLICATION
#------------------------------------------------------------------------------

# - Sending Server(s) -

# Set these on the master and on any standby that will send replication data.

#max_wal_senders = 10           # max number of walsender processes
                                # (change requires restart)
#wal_keep_segments = 0          # in logfile segments, 16MB each; 0 disables
#wal_sender_timeout = 60s       # in milliseconds; 0 disables

#max_replication_slots = 10     # max number of replication slots
                                # (change requires restart)
#track_commit_timestamp = off   # collect timestamp of transaction commit
                                # (change requires restart)

# - Master Server -

# These settings are ignored on a standby server.

#synchronous_standby_names = '' # standby servers that provide sync rep
                                # method to choose sync standbys, number of sync standbys,
                                # and comma-separated list of application_name
                                # from standby(s); '*' = all
#vacuum_defer_cleanup_age = 0   # number of xacts by which cleanup is delayed

# - Standby Servers -

# These settings are ignored on a master server.

#hot_standby = on                       # "off" disallows queries during recovery
                                        # (change requires restart)
#max_standby_archive_delay = 30s        # max delay before canceling queries
                                        # when reading WAL from archive;
                                        # -1 allows indefinite delay
#max_standby_streaming_delay = 30s      # max delay before canceling queries
                                        # when reading streaming WAL;
                                        # -1 allows indefinite delay
#wal_receiver_status_interval = 10s     # send replies at least this often
                                        # 0 disables
#hot_standby_feedback = off             # send info from standby to prevent
                                        # query conflicts
#wal_receiver_timeout = 60s             # time that receiver waits for
                                        # communication from master
                                        # in milliseconds; 0 disables
#wal_retrieve_retry_interval = 5s       # time to wait before retrying to
                                        # retrieve WAL after a failed attempt

# - Subscribers -

# These settings are ignored on a publisher.

#max_logical_replication_workers = 4    # taken from max_worker_processes
                                        # (change requires restart)
#max_sync_workers_per_subscription = 2  # taken from max_logical_replication_workers


#------------------------------------------------------------------------------
# QUERY TUNING
#------------------------------------------------------------------------------

# - Planner Method Configuration -

#enable_bitmapscan = on
#enable_hashagg = on
#enable_hashjoin = on
#enable_indexscan = on
#enable_indexonlyscan = on
#enable_material = on
#enable_mergejoin = on
#enable_nestloop = on
#enable_seqscan = on
#enable_sort = on
#enable_tidscan = on

# - Planner Cost Constants -

#seq_page_cost = 1.0                    # measured on an arbitrary scale
#random_page_cost = 4.0                 # same scale as above
#cpu_tuple_cost = 0.01                  # same scale as above
#cpu_index_tuple_cost = 0.005           # same scale as above
#cpu_operator_cost = 0.0025             # same scale as above
#parallel_tuple_cost = 0.1              # same scale as above
#parallel_setup_cost = 1000.0   # same scale as above
#min_parallel_table_scan_size = 8MB
#min_parallel_index_scan_size = 512kB
#effective_cache_size = 4GB

# - Genetic Query Optimizer -

#geqo = on
#geqo_threshold = 12
#geqo_effort = 5                        # range 1-10
#geqo_pool_size = 0                     # selects default based on effort
#geqo_generations = 0                   # selects default based on effort
#geqo_selection_bias = 2.0              # range 1.5-2.0
#geqo_seed = 0.0                        # range 0.0-1.0

# - Other Planner Options -

#default_statistics_target = 100        # range 1-10000
#constraint_exclusion = partition       # on, off, or partition
#cursor_tuple_fraction = 0.1            # range 0.0-1.0
#from_collapse_limit = 8
#join_collapse_limit = 8                # 1 disables collapsing of explicit
                                        # JOIN clauses
#force_parallel_mode = off


#------------------------------------------------------------------------------
# ERROR REPORTING AND LOGGING
#------------------------------------------------------------------------------

# - Where to Log -

#log_destination = 'stderr'             # Valid values are combinations of
                                        # stderr, csvlog, syslog, and eventlog,
                                        # depending on platform.  csvlog
                                        # requires logging_collector to be on.

# This is used when logging to stderr:
#logging_collector = off                # Enable capturing of stderr and csvlog
                                        # into log files. Required to be on for
                                        # csvlogs.
                                        # (change requires restart)

# These are only used if logging_collector is on:
#log_directory = 'log'                  # directory where log files are written,
                                        # can be absolute or relative to PGDATA
#log_filename = 'postgresql-%Y-%m-%d_%H%M%S.log'        # log file name pattern,
                                        # can include strftime() escapes
#log_file_mode = 0600                   # creation mode for log files,
                                        # begin with 0 to use octal notation
#log_truncate_on_rotation = off         # If on, an existing log file with the
                                        # same name as the new log file will be
                                        # truncated rather than appended to.
                                        # But such truncation only occurs on
                                        # time-driven rotation, not on restarts
                                        # or size-driven rotation.  Default is
                                        # off, meaning append to existing files
                                        # in all cases.
#log_rotation_age = 1d                  # Automatic rotation of logfiles will
                                        # happen after that time.  0 disables.
#log_rotation_size = 10MB               # Automatic rotation of logfiles will
                                        # happen after that much log output.
                                        # 0 disables.

# These are relevant when logging to syslog:
#syslog_facility = 'LOCAL0'
#syslog_ident = 'postgres'
#syslog_sequence_numbers = on
#syslog_split_messages = on

# This is only relevant when logging to eventlog (win32):
# (change requires restart)
#event_source = 'PostgreSQL'

# - When to Log -

#client_min_messages = notice           # values in order of decreasing detail:
                                        #   debug5
                                        #   debug4
                                        #   debug3
                                        #   debug2
                                        #   debug1
                                        #   log
                                        #   notice
                                        #   warning
                                        #   error

#log_min_messages = warning             # values in order of decreasing detail:
                                        #   debug5
                                        #   debug4
                                        #   debug3
                                        #   debug2
                                        #   debug1
                                        #   info
                                        #   notice
                                        #   warning
                                        #   error
                                        #   log
                                        #   fatal
                                        #   panic

#log_min_error_statement = error        # values in order of decreasing detail:
                                        #   debug5
                                        #   debug4
                                        #   debug3
                                        #   debug2
                                        #   debug1
                                        #   info
                                        #   notice
                                        #   warning
                                        #   error
                                        #   log
                                        #   fatal
                                        #   panic (effectively off)

#log_min_duration_statement = -1        # -1 is disabled, 0 logs all statements
                                        # and their durations, > 0 logs only
                                        # statements running at least this number
                                        # of milliseconds


# - What to Log -

#debug_print_parse = off
#debug_print_rewritten = off
#debug_print_plan = off
#debug_pretty_print = on
#log_checkpoints = off
#log_connections = off
#log_disconnections = off
#log_duration = off
#log_error_verbosity = default          # terse, default, or verbose messages
#log_hostname = off
#log_line_prefix = '%m [%p] '           # special values:
                                        #   %a = application name
                                        #   %u = user name
                                        #   %d = database name
                                        #   %r = remote host and port
                                        #   %h = remote host
                                        #   %p = process ID
                                        #   %t = timestamp without milliseconds
                                        #   %m = timestamp with milliseconds
                                        #   %n = timestamp with milliseconds (as a Unix epoch)
                                        #   %i = command tag
                                        #   %e = SQL state
                                        #   %c = session ID
                                        #   %l = session line number
                                        #   %s = session start timestamp
                                        #   %v = virtual transaction ID
                                        #   %x = transaction ID (0 if none)
                                        #   %q = stop here in non-session
                                        #        processes
                                        #   %% = '%'
                                        # e.g. '<%u%%%d> '
#log_lock_waits = off                   # log lock waits >= deadlock_timeout
#log_statement = 'none'                 # none, ddl, mod, all
#log_replication_commands = off
#log_temp_files = -1                    # log temporary files equal or larger
                                        # than the specified size in kilobytes;
                                        # -1 disables, 0 logs all temp files
#log_timezone = 'GMT'


# - Process Title -

#cluster_name = ''                      # added to process titles if nonempty
                                        # (change requires restart)
#update_process_title = on


#------------------------------------------------------------------------------
# RUNTIME STATISTICS
#------------------------------------------------------------------------------

# - Query/Index Statistics Collector -

#track_activities = on
#track_counts = on
#track_io_timing = off
#track_functions = none                 # none, pl, all
#track_activity_query_size = 1024       # (change requires restart)
#stats_temp_directory = 'pg_stat_tmp'


# - Statistics Monitoring -

#log_parser_stats = off
#log_planner_stats = off
#log_executor_stats = off
#log_statement_stats = off


#------------------------------------------------------------------------------
# AUTOVACUUM PARAMETERS
#------------------------------------------------------------------------------

#autovacuum = on                        # Enable autovacuum subprocess?  'on'
                                        # requires track_counts to also be on.
#log_autovacuum_min_duration = -1       # -1 disables, 0 logs all actions and
                                        # their durations, > 0 logs only
                                        # actions running at least this number
                                        # of milliseconds.
#autovacuum_max_workers = 3             # max number of autovacuum subprocesses
                                        # (change requires restart)
#autovacuum_naptime = 1min              # time between autovacuum runs
#autovacuum_vacuum_threshold = 50       # min number of row updates before
                                        # vacuum
#autovacuum_analyze_threshold = 50      # min number of row updates before
                                        # analyze
#autovacuum_vacuum_scale_factor = 0.2   # fraction of table size before vacuum
#autovacuum_analyze_scale_factor = 0.1  # fraction of table size before analyze
#autovacuum_freeze_max_age = 200000000  # maximum XID age before forced vacuum
                                        # (change requires restart)
#autovacuum_multixact_freeze_max_age = 400000000        # maximum multixact age
                                        # before forced vacuum
                                        # (change requires restart)
#autovacuum_vacuum_cost_delay = 20ms    # default vacuum cost delay for
                                        # autovacuum, in milliseconds;
                                        # -1 means use vacuum_cost_delay
#autovacuum_vacuum_cost_limit = -1      # default vacuum cost limit for
                                        # autovacuum, -1 means use
                                        # vacuum_cost_limit


#------------------------------------------------------------------------------
# CLIENT CONNECTION DEFAULTS
#------------------------------------------------------------------------------

# - Statement Behavior -

#search_path = '"$user", public'        # schema names
#default_tablespace = ''                # a tablespace name, '' uses the default
#temp_tablespaces = ''                  # a list of tablespace names, '' uses
                                        # only default tablespace
#check_function_bodies = on
#default_transaction_isolation = 'read committed'
#default_transaction_read_only = off
#default_transaction_deferrable = off
#session_replication_role = 'origin'
#statement_timeout = 0                  # in milliseconds, 0 is disabled
#lock_timeout = 0                       # in milliseconds, 0 is disabled
#idle_in_transaction_session_timeout = 0        # in milliseconds, 0 is disabled
#vacuum_freeze_min_age = 50000000
#vacuum_freeze_table_age = 150000000
#vacuum_multixact_freeze_min_age = 5000000
#vacuum_multixact_freeze_table_age = 150000000
#bytea_output = 'hex'                   # hex, escape
#xmlbinary = 'base64'
#xmloption = 'content'
#gin_fuzzy_search_limit = 0
#gin_pending_list_limit = 4MB

# - Locale and Formatting -

#datestyle = 'iso, mdy'
#intervalstyle = 'postgres'
#timezone = 'GMT'
#timezone_abbreviations = 'Default'     # Select the set of available time zone
                                        # abbreviations.  Currently, there are
                                        #   Default
                                        #   Australia (historical usage)
                                        #   India
                                        # You can create your own file in
                                        # share/timezonesets/.
#extra_float_digits = 0                 # min -15, max 3
#client_encoding = sql_ascii            # actually, defaults to database
                                        # encoding

# These settings are initialized by initdb, but they can be changed.
#lc_messages = 'C'                      # locale for system error message
                                        # strings
#lc_monetary = 'C'                      # locale for monetary formatting
#lc_numeric = 'C'                       # locale for number formatting
#lc_time = 'C'                          # locale for time formatting

# default configuration for text search
#default_text_search_config = 'pg_catalog.simple'

# - Other Defaults -

#dynamic_library_path = '$libdir'
#local_preload_libraries = ''
#session_preload_libraries = ''


#------------------------------------------------------------------------------
# LOCK MANAGEMENT
#------------------------------------------------------------------------------

#deadlock_timeout = 1s
#max_locks_per_transaction = 64         # min 10
                                        # (change requires restart)
#max_pred_locks_per_transaction = 64    # min 10
                                        # (change requires restart)
#max_pred_locks_per_relation = -2       # negative values mean
                                        # (max_pred_locks_per_transaction
                                        #  / -max_pred_locks_per_relation) - 1
#max_pred_locks_per_page = 2            # min 0


#------------------------------------------------------------------------------
# VERSION/PLATFORM COMPATIBILITY
#------------------------------------------------------------------------------

# - Previous PostgreSQL Versions -

#array_nulls = on
#backslash_quote = safe_encoding        # on, off, or safe_encoding
#default_with_oids = off
#escape_string_warning = on
#lo_compat_privileges = off
#operator_precedence_warning = off
#quote_all_identifiers = off
#standard_conforming_strings = on
#synchronize_seqscans = on

# - Other Platforms and Clients -

#transform_null_equals = off


#------------------------------------------------------------------------------
# ERROR HANDLING
#------------------------------------------------------------------------------

#exit_on_error = off                    # terminate session on any error?
#restart_after_crash = on               # reinitialize after backend crash?


#------------------------------------------------------------------------------
# CONFIG FILE INCLUDES
#------------------------------------------------------------------------------

# These options allow settings to be loaded from files other than the
# default postgresql.conf.

#include_dir = 'conf.d'                 # include files ending in '.conf' from
                                        # directory 'conf.d'
#include_if_exists = 'exists.conf'      # include file only if it exists
#include = 'special.conf'               # include file


#------------------------------------------------------------------------------
# CUSTOMIZED OPTIONS
#------------------------------------------------------------------------------

# Add settings for extensions here

[root@postgres bin]# postgres --describe-config
archive_command sighup  Write-Ahead Log / Archiving     STRING                          Sets the shell command that will be called to archive a WAL file.
archive_mode    postmaster      Write-Ahead Log / Archiving     ENUM    off                     Allows archiving of WAL files using archive_command.
archive_timeout sighup  Write-Ahead Log / Archiving     INTEGER 0       0       1073741823      Forces a switch to the next WAL file if a new file has not been started within N seconds.
array_nulls     user    Version and Platform Compatibility / Previous PostgreSQL Versions       BOOLEAN FALSE                   Enable input of NULL elements in arrays.  When turned on, unquoted NULL in an array input value means a null value; otherwise it is taken literally.
authentication_timeout  sighup  Connections and Authentication / Security and Authentication    INTEGER 0       1       600     Sets the maximum allowed time to complete client authentication.
autovacuum      sighup  Autovacuum      BOOLEAN FALSE                   Starts the autovacuum subprocess.
autovacuum_analyze_scale_factor sighup  Autovacuum      REAL    0       0       100     Number of tuple inserts, updates, or deletes prior to analyze as a fraction of reltuples.
autovacuum_analyze_threshold    sighup  Autovacuum      INTEGER 0       0       2147483647      Minimum number of tuple inserts, updates, or deletes prior to analyze.
autovacuum_freeze_max_age       postmaster      Autovacuum      INTEGER 0       100000  2000000000      Age at which to autovacuum a table to prevent transaction ID wraparound.
autovacuum_max_workers  postmaster      Autovacuum      INTEGER 0       1       262143  Sets the maximum number of simultaneously running autovacuum worker processes.
autovacuum_multixact_freeze_max_age     postmaster      Autovacuum      INTEGER 0       10000   2000000000      Multixact age at which to autovacuum a table to prevent multixact wraparound.
autovacuum_naptime      sighup  Autovacuum      INTEGER 0       1       2147483 Time to sleep between autovacuum runs.
autovacuum_vacuum_cost_delay    sighup  Autovacuum      INTEGER 0       -1      100     Vacuum cost delay in milliseconds, for autovacuum.
autovacuum_vacuum_cost_limit    sighup  Autovacuum      INTEGER 0       -1      10000   Vacuum cost amount available before napping, for autovacuum.
autovacuum_vacuum_scale_factor  sighup  Autovacuum      REAL    0       0       100     Number of tuple updates or deletes prior to vacuum as a fraction of reltuples.
autovacuum_vacuum_threshold     sighup  Autovacuum      INTEGER 0       0       2147483647      Minimum number of tuple updates or deletes prior to vacuum.
autovacuum_work_mem     sighup  Resource Usage / Memory INTEGER 0       -1      2147483647      Sets the maximum memory to be used by each autovacuum worker process.
backend_flush_after     user    Resource Usage / Asynchronous Behavior  INTEGER 0       0       256     Number of pages after which previously performed writes are flushed to disk.
backslash_quote user    Version and Platform Compatibility / Previous PostgreSQL Versions       ENUM    safe_encoding                   Sets whether "\'" is allowed in string literals.
bgwriter_delay  sighup  Resource Usage / Background Writer      INTEGER 0       10      10000   Background writer sleep time between rounds.
bgwriter_flush_after    sighup  Resource Usage / Background Writer      INTEGER 0       0       256     Number of pages after which previously performed writes are flushed to disk.
bgwriter_lru_maxpages   sighup  Resource Usage / Background Writer      INTEGER 0       0       1073741823      Background writer maximum number of LRU pages to flush per round.
bgwriter_lru_multiplier sighup  Resource Usage / Background Writer      REAL    0       0       10      Multiple of the average buffer usage to free per round.
bonjour postmaster      Connections and Authentication / Connection Settings    BOOLEAN FALSE                   Enables advertising the server via Bonjour.
bonjour_name    postmaster      Connections and Authentication / Connection Settings    STRING                          Sets the Bonjour service name.
bytea_output    user    Client Connection Defaults / Statement Behavior ENUM    hex                     Sets the output format for bytea.
check_function_bodies   user    Client Connection Defaults / Statement Behavior BOOLEAN FALSE                   Check function bodies during CREATE FUNCTION.
checkpoint_completion_target    sighup  Write-Ahead Log / Checkpoints   REAL    0       0       1       Time spent flushing dirty buffers during checkpoint, as fraction of checkpoint interval.
checkpoint_flush_after  sighup  Write-Ahead Log / Checkpoints   INTEGER 0       0       256     Number of pages after which previously performed writes are flushed to disk.
checkpoint_timeout      sighup  Write-Ahead Log / Checkpoints   INTEGER 0       30      86400   Sets the maximum time between automatic WAL checkpoints.
checkpoint_warning      sighup  Write-Ahead Log / Checkpoints   INTEGER 0       0       2147483647      Enables warnings if checkpoint segments are filled more frequently than this.     Write a message to the server log if checkpoints caused by the filling of checkpoint segment files happens more frequently than this number of seconds. Zero turns off the warning.
client_encoding user    Client Connection Defaults / Locale and Formatting      STRING  SQL_ASCII                       Sets the client's character set encoding.
client_min_messages     user    Reporting and Logging / When to Log     ENUM    notice                  Sets the message levels that are sent to the client.      Each level includes all the levels that follow it. The later the level, the fewer messages are sent.
cluster_name    postmaster      Process Title   STRING                          Sets the name of the cluster, which is included in the process title.
commit_delay    superuser       Write-Ahead Log / Settings      INTEGER 0       0       100000  Sets the delay in microseconds between transaction commit and flushing WAL to disk.
commit_siblings user    Write-Ahead Log / Settings      INTEGER 0       0       1000    Sets the minimum concurrent open transactions before performing commit_delay.
constraint_exclusion    user    Query Tuning / Other Planner Options    ENUM    partition                       Enables the planner to use constraints to optimize queries.       Table scans will be skipped if their constraints guarantee that no rows match the query.
cpu_index_tuple_cost    user    Query Tuning / Planner Cost Constants   REAL    0       0       1.79769e+308    Sets the planner's estimate of the cost of processing each index entry during an index scan.
cpu_operator_cost       user    Query Tuning / Planner Cost Constants   REAL    0       0       1.79769e+308    Sets the planner's estimate of the cost of processing each operator or function call.
cpu_tuple_cost  user    Query Tuning / Planner Cost Constants   REAL    0       0       1.79769e+308    Sets the planner's estimate of the cost of processing each tuple (row).
cursor_tuple_fraction   user    Query Tuning / Other Planner Options    REAL    0       0       1       Sets the planner's estimate of the fraction of a cursor's rows that will be retrieved.
data_directory  postmaster      File Locations  STRING                          Sets the server's data directory.
DateStyle       user    Client Connection Defaults / Locale and Formatting      STRING  ISO, MDY                        Sets the display format for date and time values. Also controls interpretation of ambiguous date inputs.
db_user_namespace       sighup  Connections and Authentication / Security and Authentication    BOOLEAN FALSE                   Enables per-database user names.
deadlock_timeout        superuser       Lock Management INTEGER 0       1       2147483647      Sets the time to wait on a lock before checking for deadlock.
debug_pretty_print      user    Reporting and Logging / What to Log     BOOLEAN FALSE                   Indents parse and plan tree displays.
debug_print_parse       user    Reporting and Logging / What to Log     BOOLEAN FALSE                   Logs each query's parse tree.
debug_print_plan        user    Reporting and Logging / What to Log     BOOLEAN FALSE                   Logs each query's execution plan.
debug_print_rewritten   user    Reporting and Logging / What to Log     BOOLEAN FALSE                   Logs each query's rewritten parse tree.
default_statistics_target       user    Query Tuning / Other Planner Options    INTEGER 0       1       10000   Sets the default statistics target.       This applies to table columns that have not had a column-specific target set via ALTER TABLE SET STATISTICS.
default_tablespace      user    Client Connection Defaults / Statement Behavior STRING                          Sets the default tablespace to create tables and indexes in.      An empty string selects the database's default tablespace.
default_text_search_config      user    Client Connection Defaults / Locale and Formatting      STRING  pg_catalog.simple                       Sets default text search configuration.
default_transaction_deferrable  user    Client Connection Defaults / Statement Behavior BOOLEAN FALSE                   Sets the default deferrable status of new transactions.
default_transaction_isolation   user    Client Connection Defaults / Statement Behavior ENUM    read committed                  Sets the transaction isolation level of each new transaction.
default_transaction_read_only   user    Client Connection Defaults / Statement Behavior BOOLEAN FALSE                   Sets the default read-only status of new transactions.
default_with_oids       user    Version and Platform Compatibility / Previous PostgreSQL Versions       BOOLEAN FALSE                   Create new tables with OIDs by default.
dynamic_library_path    superuser       Client Connection Defaults / Other Defaults     STRING  $libdir                 Sets the path for dynamically loadable modules.   If a dynamically loadable module needs to be opened and the specified name does not have a directory component (i.e., the name does not contain a slash), the system will search this path for the specified file.
dynamic_shared_memory_type      postmaster      Resource Usage / Memory ENUM    posix                   Selects the dynamic shared memory implementation used.
effective_cache_size    user    Query Tuning / Planner Cost Constants   INTEGER 0       1       2147483647      Sets the planner's assumption about the size of the disk cache.   That is, the portion of the kernel's disk cache that will be used for PostgreSQL data files. This is measured in disk pages, which are normally 8 kB each.
effective_io_concurrency        user    Resource Usage / Asynchronous Behavior  INTEGER 0       0       1000    Number of simultaneous requests that can be handled efficiently by the disk subsystem.    For RAID arrays, this should be approximately the number of drive spindles in the array.
enable_bitmapscan       user    Query Tuning / Planner Method Configuration     BOOLEAN FALSE                   Enables the planner's use of bitmap-scan plans.
enable_gathermerge      user    Query Tuning / Planner Method Configuration     BOOLEAN FALSE                   Enables the planner's use of gather merge plans.
enable_hashagg  user    Query Tuning / Planner Method Configuration     BOOLEAN FALSE                   Enables the planner's use of hashed aggregation plans.
enable_hashjoin user    Query Tuning / Planner Method Configuration     BOOLEAN FALSE                   Enables the planner's use of hash join plans.
enable_indexonlyscan    user    Query Tuning / Planner Method Configuration     BOOLEAN FALSE                   Enables the planner's use of index-only-scan plans.
enable_indexscan        user    Query Tuning / Planner Method Configuration     BOOLEAN FALSE                   Enables the planner's use of index-scan plans.
enable_material user    Query Tuning / Planner Method Configuration     BOOLEAN FALSE                   Enables the planner's use of materialization.
enable_mergejoin        user    Query Tuning / Planner Method Configuration     BOOLEAN FALSE                   Enables the planner's use of merge join plans.
enable_nestloop user    Query Tuning / Planner Method Configuration     BOOLEAN FALSE                   Enables the planner's use of nested-loop join plans.
enable_seqscan  user    Query Tuning / Planner Method Configuration     BOOLEAN FALSE                   Enables the planner's use of sequential-scan plans.
enable_sort     user    Query Tuning / Planner Method Configuration     BOOLEAN FALSE                   Enables the planner's use of explicit sort steps.
enable_tidscan  user    Query Tuning / Planner Method Configuration     BOOLEAN FALSE                   Enables the planner's use of TID scan plans.
escape_string_warning   user    Version and Platform Compatibility / Previous PostgreSQL Versions       BOOLEAN FALSE                   Warn about backslash escapes in ordinary string literals.
event_source    postmaster      Reporting and Logging / Where to Log    STRING  PostgreSQL                      Sets the application name used to identify PostgreSQL messages in the event log.
exit_on_error   user    Error Handling  BOOLEAN FALSE                   Terminate session on any error.
external_pid_file       postmaster      File Locations  STRING                          Writes the postmaster PID to the specified file.
extra_float_digits      user    Client Connection Defaults / Locale and Formatting      INTEGER 0       -15     3       Sets the number of digits displayed for floating-point values.    This affects real, double precision, and geometric data types. The parameter value is added to the standard number of digits (FLT_DIG or DBL_DIG as appropriate).
force_parallel_mode     user    Query Tuning / Other Planner Options    ENUM    off                     Forces use of parallel query facilities.  If possible, run query using a parallel worker and with parallel restrictions.
from_collapse_limit     user    Query Tuning / Other Planner Options    INTEGER 0       1       2147483647      Sets the FROM-list size beyond which subqueries are not collapsed.        The planner will merge subqueries into upper queries if the resulting FROM list would have no more than this many items.
fsync   sighup  Write-Ahead Log / Settings      BOOLEAN FALSE                   Forces synchronization of updates to disk.      The server will use the fsync() system call in several places to make sure that updates are physically written to disk. This insures that a database cluster will recover to a consistent state after an operating system or hardware crash.
full_page_writes        sighup  Write-Ahead Log / Settings      BOOLEAN FALSE                   Writes full pages to WAL when first modified after a checkpoint.  A page write in process during an operating system crash might be only partially written to disk.  During recovery, the row changes stored in WAL are not enough to recover.  This option writes pages when first modified after a checkpoint to WAL so full recovery is possible.
geqo    user    Query Tuning / Genetic Query Optimizer  BOOLEAN FALSE                   Enables genetic query optimization.     This algorithm attempts to do planning without exhaustive searching.
geqo_effort     user    Query Tuning / Genetic Query Optimizer  INTEGER 0       1       10      GEQO: effort is used to set the default for other GEQO parameters.
geqo_generations        user    Query Tuning / Genetic Query Optimizer  INTEGER 0       0       2147483647      GEQO: number of iterations of the algorithm.      Zero selects a suitable default value.
geqo_pool_size  user    Query Tuning / Genetic Query Optimizer  INTEGER 0       0       2147483647      GEQO: number of individuals in the population.    Zero selects a suitable default value.
geqo_seed       user    Query Tuning / Genetic Query Optimizer  REAL    0       0       1       GEQO: seed for random path selection.
geqo_selection_bias     user    Query Tuning / Genetic Query Optimizer  REAL    0       1.5     2       GEQO: selective pressure within the population.
geqo_threshold  user    Query Tuning / Genetic Query Optimizer  INTEGER 0       2       2147483647      Sets the threshold of FROM items beyond which GEQO is used.
gin_fuzzy_search_limit  user    Client Connection Defaults / Other Defaults     INTEGER 0       0       2147483647      Sets the maximum allowed result for exact search by GIN.
gin_pending_list_limit  user    Client Connection Defaults / Statement Behavior INTEGER 0       64      2147483647      Sets the maximum size of the pending list for GIN index.
hba_file        postmaster      File Locations  STRING                          Sets the server's "hba" configuration file.
hot_standby     postmaster      Replication / Standby Servers   BOOLEAN FALSE                   Allows connections and queries during recovery.
hot_standby_feedback    sighup  Replication / Standby Servers   BOOLEAN FALSE                   Allows feedback from a hot standby to the primary that will avoid query conflicts.
huge_pages      postmaster      Resource Usage / Memory ENUM    try                     Use of huge pages on Linux.
ident_file      postmaster      File Locations  STRING                          Sets the server's "ident" configuration file.
idle_in_transaction_session_timeout     user    Client Connection Defaults / Statement Behavior INTEGER 0       0       2147483647      Sets the maximum allowed duration of any idling transaction.      A value of 0 turns off the timeout.
IntervalStyle   user    Client Connection Defaults / Locale and Formatting      ENUM    postgres                        Sets the display format for interval values.
join_collapse_limit     user    Query Tuning / Other Planner Options    INTEGER 0       1       2147483647      Sets the FROM-list size beyond which JOIN constructs are not flattened.   The planner will flatten explicit JOIN constructs into lists of FROM items whenever a list of no more than this many items would result.
krb_caseins_users       sighup  Connections and Authentication / Security and Authentication    BOOLEAN FALSE                   Sets whether Kerberos and GSSAPI user names should be treated as case-insensitive.
krb_server_keyfile      sighup  Connections and Authentication / Security and Authentication    STRING                          Sets the location of the Kerberos server key file.
lc_messages     superuser       Client Connection Defaults / Locale and Formatting      STRING                          Sets the language in which messages are displayed.
lc_monetary     user    Client Connection Defaults / Locale and Formatting      STRING  C                       Sets the locale for formatting monetary amounts.
lc_numeric      user    Client Connection Defaults / Locale and Formatting      STRING  C                       Sets the locale for formatting numbers.
lc_time user    Client Connection Defaults / Locale and Formatting      STRING  C                       Sets the locale for formatting date and time values.
listen_addresses        postmaster      Connections and Authentication / Connection Settings    STRING  localhost                       Sets the host name or IP address(es) to listen to.
lo_compat_privileges    superuser       Version and Platform Compatibility / Previous PostgreSQL Versions       BOOLEAN FALSE                   Enables backward compatibility mode for privilege checks on large objects.        Skips privilege checks when reading or modifying large objects, for compatibility with PostgreSQL releases prior to 9.0.
local_preload_libraries user    Client Connection Defaults / Shared Library Preloading  STRING                          Lists unprivileged shared libraries to preload into each backend.
lock_timeout    user    Client Connection Defaults / Statement Behavior INTEGER 0       0       2147483647      Sets the maximum allowed duration of any wait for a lock. A value of 0 turns off the timeout.
log_autovacuum_min_duration     sighup  Reporting and Logging / What to Log     INTEGER 0       -1      2147483647      Sets the minimum execution time above which autovacuum actions will be logged.    Zero prints all actions. -1 turns autovacuum logging off.
log_checkpoints sighup  Reporting and Logging / What to Log     BOOLEAN FALSE                   Logs each checkpoint.
log_connections superuser-backend       Reporting and Logging / What to Log     BOOLEAN FALSE                   Logs each successful connection.
log_destination sighup  Reporting and Logging / Where to Log    STRING  stderr                  Sets the destination for server log output.     Valid values are combinations of "stderr", "syslog", "csvlog", and "eventlog", depending on the platform.
log_directory   sighup  Reporting and Logging / Where to Log    STRING  log                     Sets the destination directory for log files.   Can be specified as relative to the data directory or as absolute path.
log_disconnections      superuser-backend       Reporting and Logging / What to Log     BOOLEAN FALSE                   Logs end of a session, including duration.
log_duration    superuser       Reporting and Logging / What to Log     BOOLEAN FALSE                   Logs the duration of each completed SQL statement.
log_error_verbosity     superuser       Reporting and Logging / What to Log     ENUM    default                 Sets the verbosity of logged messages.
log_executor_stats      superuser       Statistics / Monitoring BOOLEAN FALSE                   Writes executor performance statistics to the server log.
log_file_mode   sighup  Reporting and Logging / Where to Log    INTEGER 0       0       511     Sets the file permissions for log files.        The parameter value is expected to be a numeric mode specification in the form accepted by the chmod and umask system calls. (To use the customary octal format the number must start with a 0 (zero).)
log_filename    sighup  Reporting and Logging / Where to Log    STRING  postgresql-%Y-%m-%d_%H%M%S.log                  Sets the file name pattern for log files.
log_hostname    sighup  Reporting and Logging / What to Log     BOOLEAN FALSE                   Logs the host name in the connection logs.      By default, connection logs only show the IP address of the connecting host. If you want them to show the host name you can turn this on, but depending on your host name resolution setup it might impose a non-negligible performance penalty.
log_line_prefix sighup  Reporting and Logging / What to Log     STRING  %m [%p]                         Controls information prefixed to each log line.   If blank, no prefix is used.
log_lock_waits  superuser       Reporting and Logging / What to Log     BOOLEAN FALSE                   Logs long lock waits.
log_min_duration_statement      superuser       Reporting and Logging / When to Log     INTEGER 0       -1      2147483647      Sets the minimum execution time above which statements will be logged.    Zero prints all queries. -1 turns this feature off.
log_min_error_statement superuser       Reporting and Logging / When to Log     ENUM    error                   Causes all statements generating error at or above this level to be logged.       Each level includes all the levels that follow it. The later the level, the fewer messages are sent.
log_min_messages        superuser       Reporting and Logging / When to Log     ENUM    warning                 Sets the message levels that are logged.  Each level includes all the levels that follow it. The later the level, the fewer messages are sent.
log_parser_stats        superuser       Statistics / Monitoring BOOLEAN FALSE                   Writes parser performance statistics to the server log.
log_planner_stats       superuser       Statistics / Monitoring BOOLEAN FALSE                   Writes planner performance statistics to the server log.
log_replication_commands        superuser       Reporting and Logging / What to Log     BOOLEAN FALSE                   Logs each replication command.
log_rotation_age        sighup  Reporting and Logging / Where to Log    INTEGER 0       0       35791394        Automatic log file rotation will occur after N minutes.
log_rotation_size       sighup  Reporting and Logging / Where to Log    INTEGER 0       0       2097151 Automatic log file rotation will occur after N kilobytes.
log_statement   superuser       Reporting and Logging / What to Log     ENUM    none                    Sets the type of statements logged.
log_statement_stats     superuser       Statistics / Monitoring BOOLEAN FALSE                   Writes cumulative performance statistics to the server log.
log_temp_files  superuser       Reporting and Logging / What to Log     INTEGER 0       -1      2147483647      Log the use of temporary files larger than this number of kilobytes.      Zero logs all files. The default is -1 (turning this feature off).
log_timezone    sighup  Reporting and Logging / What to Log     STRING  GMT                     Sets the time zone to use in log messages.
log_truncate_on_rotation        sighup  Reporting and Logging / Where to Log    BOOLEAN FALSE                   Truncate existing log files of same name during log rotation.
logging_collector       postmaster      Reporting and Logging / Where to Log    BOOLEAN FALSE                   Start a subprocess to capture stderr output and/or csvlogs into log files.
maintenance_work_mem    user    Resource Usage / Memory INTEGER 0       1024    2147483647      Sets the maximum memory to be used for maintenance operations.    This includes operations such as VACUUM and CREATE INDEX.
max_connections postmaster      Connections and Authentication / Connection Settings    INTEGER 0       1       262143  Sets the maximum number of concurrent connections.
max_files_per_process   postmaster      Resource Usage / Kernel Resources       INTEGER 0       25      2147483647      Sets the maximum number of simultaneously open files for each server process.
max_locks_per_transaction       postmaster      Lock Management INTEGER 0       10      2147483647      Sets the maximum number of locks per transaction. The shared lock table is sized on the assumption that at most max_locks_per_transaction * max_connections distinct objects will need to be locked at any one time.
max_logical_replication_workers postmaster      Replication / Subscribers       INTEGER 0       0       262143  Maximum number of logical replication worker processes.
max_parallel_workers    user    Resource Usage / Asynchronous Behavior  INTEGER 0       0       1024    Sets the maximum number of parallel workers than can be active at one time.
max_parallel_workers_per_gather user    Resource Usage / Asynchronous Behavior  INTEGER 0       0       1024    Sets the maximum number of parallel processes per executor node.
max_pred_locks_per_page sighup  Lock Management INTEGER 0       0       2147483647      Sets the maximum number of predicate-locked tuples per page.      If more than this number of tuples on the same page are locked by a connection, those locks are replaced by a page-level lock.
max_pred_locks_per_relation     sighup  Lock Management INTEGER 0       -2147483648     2147483647      Sets the maximum number of predicate-locked pages and tuples per relation.        If more than this total of pages and tuples in the same relation are locked by a connection, those locks are replaced by a relation-level lock.
max_pred_locks_per_transaction  postmaster      Lock Management INTEGER 0       10      2147483647      Sets the maximum number of predicate locks per transaction.       The shared predicate lock table is sized on the assumption that at most max_pred_locks_per_transaction * max_connections distinct objects will need to be locked at any one time.
max_prepared_transactions       postmaster      Resource Usage / Memory INTEGER 0       0       262143  Sets the maximum number of simultaneously prepared transactions.
max_replication_slots   postmaster      Replication / Sending Servers   INTEGER 0       0       262143  Sets the maximum number of simultaneously defined replication slots.
max_stack_depth superuser       Resource Usage / Memory INTEGER 0       100     2147483647      Sets the maximum stack depth, in kilobytes.
max_standby_archive_delay       sighup  Replication / Standby Servers   INTEGER 0       -1      2147483647      Sets the maximum delay before canceling queries when a hot standby server is processing archived WAL data.
max_standby_streaming_delay     sighup  Replication / Standby Servers   INTEGER 0       -1      2147483647      Sets the maximum delay before canceling queries when a hot standby server is processing streamed WAL data.
max_sync_workers_per_subscription       sighup  Replication / Subscribers       INTEGER 0       0       262143  Maximum number of table synchronization workers per subscription.
max_wal_senders postmaster      Replication / Sending Servers   INTEGER 0       0       262143  Sets the maximum number of simultaneously running WAL sender processes.
max_wal_size    sighup  Write-Ahead Log / Checkpoints   INTEGER 0       2       2147483647      Sets the WAL size that triggers a checkpoint.
max_worker_processes    postmaster      Resource Usage / Asynchronous Behavior  INTEGER 0       0       262143  Maximum number of concurrent worker processes.
min_parallel_index_scan_size    user    Query Tuning / Planner Cost Constants   INTEGER 0       0       715827882       Sets the minimum amount of index data for a parallel scan.        If the planner estimates that it will read a number of index pages too small to reach this limit, a parallel scan will not be considered.
min_parallel_table_scan_size    user    Query Tuning / Planner Cost Constants   INTEGER 0       0       715827882       Sets the minimum amount of table data for a parallel scan.        If the planner estimates that it will read a number of table pages too small to reach this limit, a parallel scan will not be considered.
min_wal_size    sighup  Write-Ahead Log / Checkpoints   INTEGER 0       2       2147483647      Sets the minimum size to shrink the WAL to.
old_snapshot_threshold  postmaster      Resource Usage / Asynchronous Behavior  INTEGER 0       -1      86400   Time before a snapshot is too old to read pages changed after the snapshot was taken.     A value of -1 disables this feature.
operator_precedence_warning     user    Version and Platform Compatibility / Previous PostgreSQL Versions       BOOLEAN FALSE                   Emit a warning for constructs that changed meaning since PostgreSQL 9.4.
parallel_setup_cost     user    Query Tuning / Planner Cost Constants   REAL    0       0       1.79769e+308    Sets the planner's estimate of the cost of starting up worker processes for parallel query.
parallel_tuple_cost     user    Query Tuning / Planner Cost Constants   REAL    0       0       1.79769e+308    Sets the planner's estimate of the cost of passing each tuple (row) from worker to master backend.
password_encryption     user    Connections and Authentication / Security and Authentication    ENUM    md5                     Encrypt passwords.        When a password is specified in CREATE USER or ALTER USER without writing either ENCRYPTED or UNENCRYPTED, this parameter determines whether the password is to be encrypted.
port    postmaster      Connections and Authentication / Connection Settings    INTEGER 0       1       65535   Sets the TCP port the server listens on.
quote_all_identifiers   user    Version and Platform Compatibility / Previous PostgreSQL Versions       BOOLEAN FALSE                   When generating SQL fragments, quote all identifiers.
random_page_cost        user    Query Tuning / Planner Cost Constants   REAL    0       0       1.79769e+308    Sets the planner's estimate of the cost of a nonsequentially fetched disk page.
replacement_sort_tuples user    Resource Usage / Memory INTEGER 0       0       2147483647      Sets the maximum number of tuples to be sorted using replacement selection.       When more tuples than this are present, quicksort will be used.
restart_after_crash     sighup  Error Handling  BOOLEAN FALSE                   Reinitialize server after backend crash.
row_security    user    Connections and Authentication / Security and Authentication    BOOLEAN FALSE                   Enable row security.    When enabled, row security will be applied to all users.
search_path     user    Client Connection Defaults / Statement Behavior STRING  "$user", public                 Sets the schema search order for names that are not schema-qualified.
seq_page_cost   user    Query Tuning / Planner Cost Constants   REAL    0       0       1.79769e+308    Sets the planner's estimate of the cost of a sequentially fetched disk page.
session_preload_libraries       superuser       Client Connection Defaults / Shared Library Preloading  STRING                          Lists shared libraries to preload into each backend.
session_replication_role        superuser       Client Connection Defaults / Statement Behavior ENUM    origin                  Sets the session's behavior for triggers and rewrite rules.
shared_buffers  postmaster      Resource Usage / Memory INTEGER 0       16      1073741823      Sets the number of shared memory buffers used by the server.
shared_preload_libraries        postmaster      Client Connection Defaults / Shared Library Preloading  STRING                          Lists shared libraries to preload into server.
ssl     sighup  Connections and Authentication / Security and Authentication    BOOLEAN FALSE                   Enables SSL connections.
ssl_ca_file     sighup  Connections and Authentication / Security and Authentication    STRING                          Location of the SSL certificate authority file.
ssl_cert_file   sighup  Connections and Authentication / Security and Authentication    STRING  server.crt                      Location of the SSL server certificate file.
ssl_ciphers     sighup  Connections and Authentication / Security and Authentication    STRING  none                    Sets the list of allowed SSL ciphers.
ssl_crl_file    sighup  Connections and Authentication / Security and Authentication    STRING                          Location of the SSL certificate revocation list file.
ssl_dh_params_file      sighup  Connections and Authentication / Security and Authentication    STRING                          Location of the SSL DH parameters file.
ssl_ecdh_curve  sighup  Connections and Authentication / Security and Authentication    STRING  none                    Sets the curve to use for ECDH.
ssl_key_file    sighup  Connections and Authentication / Security and Authentication    STRING  server.key                      Location of the SSL server private key file.
ssl_prefer_server_ciphers       sighup  Connections and Authentication / Security and Authentication    BOOLEAN FALSE                   Give priority to server ciphersuite order.
standard_conforming_strings     user    Version and Platform Compatibility / Previous PostgreSQL Versions       BOOLEAN FALSE                   Causes '...' strings to treat backslashes literally.
statement_timeout       user    Client Connection Defaults / Statement Behavior INTEGER 0       0       2147483647      Sets the maximum allowed duration of any statement.       A value of 0 turns off the timeout.
stats_temp_directory    sighup  Statistics / Query and Index Statistics Collector       STRING  pg_stat_tmp                     Writes temporary statistics files to the specified directory.
superuser_reserved_connections  postmaster      Connections and Authentication / Connection Settings    INTEGER 0       0       262143  Sets the number of connection slots reserved for superusers.
synchronize_seqscans    user    Version and Platform Compatibility / Previous PostgreSQL Versions       BOOLEAN FALSE                   Enable synchronized sequential scans.
synchronous_commit      user    Write-Ahead Log / Settings      ENUM    on                      Sets the current transaction's synchronization level.
synchronous_standby_names       sighup  Replication / Master Server     STRING                          Number of synchronous standbys and list of names of potential synchronous ones.
syslog_facility sighup  Reporting and Logging / Where to Log    ENUM    local0                  Sets the syslog "facility" to be used when syslog enabled.
syslog_ident    sighup  Reporting and Logging / Where to Log    STRING  postgres                        Sets the program name used to identify PostgreSQL messages in syslog.
syslog_sequence_numbers sighup  Reporting and Logging / Where to Log    BOOLEAN FALSE                   Add sequence number to syslog messages to avoid duplicate suppression.
syslog_split_messages   sighup  Reporting and Logging / Where to Log    BOOLEAN FALSE                   Split messages sent to syslog by lines and to fit into 1024 bytes.
tcp_keepalives_count    user    Client Connection Defaults / Other Defaults     INTEGER 0       0       2147483647      Maximum number of TCP keepalive retransmits.      This controls the number of consecutive keepalive retransmits that can be lost before a connection is considered dead. A value of 0 uses the system default.
tcp_keepalives_idle     user    Client Connection Defaults / Other Defaults     INTEGER 0       0       2147483647      Time between issuing TCP keepalives.      A value of 0 uses the system default.
tcp_keepalives_interval user    Client Connection Defaults / Other Defaults     INTEGER 0       0       2147483647      Time between TCP keepalive retransmits.   A value of 0 uses the system default.
temp_buffers    user    Resource Usage / Memory INTEGER 0       100     1073741823      Sets the maximum number of temporary buffers used by each session.
temp_file_limit superuser       Resource Usage / Disk   INTEGER 0       -1      2147483647      Limits the total size of all temporary files used by each process.        -1 means no limit.
temp_tablespaces        user    Client Connection Defaults / Statement Behavior STRING                          Sets the tablespace(s) to use for temporary tables and sort files.
TimeZone        user    Client Connection Defaults / Locale and Formatting      STRING  GMT                     Sets the time zone for displaying and interpreting time stamps.
timezone_abbreviations  user    Client Connection Defaults / Locale and Formatting      STRING                          Selects a file of time zone abbreviations.
trace_recovery_messages sighup  Developer Options       ENUM    log                     Enables logging of recovery-related debugging information.        Each level includes all the levels that follow it. The later the level, the fewer messages are sent.
track_activities        superuser       Statistics / Query and Index Statistics Collector       BOOLEAN FALSE                   Collects information about executing commands.    Enables the collection of information on the currently executing command of each session, along with the time at which that command began execution.
track_activity_query_size       postmaster      Resource Usage / Memory INTEGER 0       100     102400  Sets the size reserved for pg_stat_activity.query, in bytes.
track_commit_timestamp  postmaster      Replication     BOOLEAN FALSE                   Collects transaction commit time.
track_counts    superuser       Statistics / Query and Index Statistics Collector       BOOLEAN FALSE                   Collects statistics on database activity.
track_functions superuser       Statistics / Query and Index Statistics Collector       ENUM    none                    Collects function-level statistics on database activity.
track_io_timing superuser       Statistics / Query and Index Statistics Collector       BOOLEAN FALSE                   Collects timing statistics for database I/O activity.
transform_null_equals   user    Version and Platform Compatibility / Other Platforms and Clients        BOOLEAN FALSE                   Treats "expr=NULL" as "expr IS NULL".     When turned on, expressions of the form expr = NULL (or NULL = expr) are treated as expr IS NULL, that is, they return true if expr evaluates to the null value, and false otherwise. The correct behavior of expr = NULL is to always return null (unknown).
unix_socket_directories postmaster      Connections and Authentication / Connection Settings    STRING  /tmp                    Sets the directories where Unix-domain sockets will be created.
unix_socket_group       postmaster      Connections and Authentication / Connection Settings    STRING                          Sets the owning group of the Unix-domain socket.  The owning user of the socket is always the user that starts the server.
unix_socket_permissions postmaster      Connections and Authentication / Connection Settings    INTEGER 0       0       511     Sets the access permissions of the Unix-domain socket.    Unix-domain sockets use the usual Unix file system permission set. The parameter value is expected to be a numeric mode specification in the form accepted by the chmod and umask system calls. (To use the customary octal format the number must start with a 0 (zero).)
update_process_title    superuser       Process Title   BOOLEAN FALSE                   Updates the process title to show the active SQL command. Enables updating of the process title every time a new SQL command is received by the server.
vacuum_cost_delay       user    Resource Usage / Cost-Based Vacuum Delay        INTEGER 0       0       100     Vacuum cost delay in milliseconds.
vacuum_cost_limit       user    Resource Usage / Cost-Based Vacuum Delay        INTEGER 0       1       10000   Vacuum cost amount available before napping.
vacuum_cost_page_dirty  user    Resource Usage / Cost-Based Vacuum Delay        INTEGER 0       0       10000   Vacuum cost for a page dirtied by vacuum.
vacuum_cost_page_hit    user    Resource Usage / Cost-Based Vacuum Delay        INTEGER 0       0       10000   Vacuum cost for a page found in the buffer cache.
vacuum_cost_page_miss   user    Resource Usage / Cost-Based Vacuum Delay        INTEGER 0       0       10000   Vacuum cost for a page not found in the buffer cache.
vacuum_defer_cleanup_age        sighup  Replication / Master Server     INTEGER 0       0       1000000 Number of transactions by which VACUUM and HOT cleanup should be deferred, if any.
vacuum_freeze_min_age   user    Client Connection Defaults / Statement Behavior INTEGER 0       0       1000000000      Minimum age at which VACUUM should freeze a table row.
vacuum_freeze_table_age user    Client Connection Defaults / Statement Behavior INTEGER 0       0       2000000000      Age at which VACUUM should scan whole table to freeze tuples.
vacuum_multixact_freeze_min_age user    Client Connection Defaults / Statement Behavior INTEGER 0       0       1000000000      Minimum age at which VACUUM should freeze a MultiXactId in a table row.
vacuum_multixact_freeze_table_age       user    Client Connection Defaults / Statement Behavior INTEGER 0       0       2000000000      Multixact age at which VACUUM should scan whole table to freeze tuples.
wal_buffers     postmaster      Write-Ahead Log / Settings      INTEGER 0       -1      262143  Sets the number of disk-page buffers in shared memory for WAL.
wal_compression superuser       Write-Ahead Log / Settings      BOOLEAN FALSE                   Compresses full-page writes written in WAL file.
wal_keep_segments       sighup  Replication / Sending Servers   INTEGER 0       0       2147483647      Sets the number of WAL files held for standby servers.
wal_level       postmaster      Write-Ahead Log / Settings      ENUM    replica                 Set the level of information written to the WAL.
wal_log_hints   postmaster      Write-Ahead Log / Settings      BOOLEAN FALSE                   Writes full pages to WAL when first modified after a checkpoint, even for a non-critical modifications.
wal_receiver_status_interval    sighup  Replication / Standby Servers   INTEGER 0       0       2147483 Sets the maximum interval between WAL receiver status reports to the primary.
wal_receiver_timeout    sighup  Replication / Standby Servers   INTEGER 0       0       2147483647      Sets the maximum wait time to receive data from the primary.
wal_retrieve_retry_interval     sighup  Replication / Standby Servers   INTEGER 0       1       2147483647      Sets the time to wait before retrying to retrieve WAL after a failed attempt.
wal_sender_timeout      sighup  Replication / Sending Servers   INTEGER 0       0       2147483647      Sets the maximum time to wait for WAL replication.
wal_sync_method sighup  Write-Ahead Log / Settings      ENUM    fdatasync                       Selects the method used for forcing WAL updates to disk.
wal_writer_delay        sighup  Write-Ahead Log / Settings      INTEGER 0       1       10000   Time between WAL flushes performed in the WAL writer.
wal_writer_flush_after  sighup  Write-Ahead Log / Settings      INTEGER 0       0       2147483647      Amount of WAL written out by WAL writer that triggers a flush.
work_mem        user    Resource Usage / Memory INTEGER 0       64      2147483647      Sets the maximum memory to be used for query workspaces.  This much memory can be used by each internal sort operation and hash table before switching to temporary disk files.
xmlbinary       user    Client Connection Defaults / Statement Behavior ENUM    base64                  Sets how binary values are to be encoded in XML.
xmloption       user    Client Connection Defaults / Statement Behavior ENUM    content                 Sets whether XML data in implicit parsing and serialization operations is to be considered as documents or content fragments.