postgresql.conf.sample

# -----------------------------
# PostgreSQL configuration file
# -----------------------------
#
# This file consists of lines of the form:
#
#   name = value
#
# (The '=' is optional.) White space may be used. Comments are introduced
# with '#' anywhere on a line. The complete list of option names and
# allowed values can be found in the PostgreSQL documentation. The
# commented-out settings shown in this file represent the default values.
#
# Please note that re-commenting a setting is NOT sufficient to revert it
# to the default value, unless you restart the postmaster.
#
# Any option can also be given as a command line switch to the
# postmaster, e.g. 'postmaster -c log_connections=on'. Some options
# can be changed at run-time with the 'SET' SQL command.
#
# This file is read on postmaster startup and when the postmaster
# receives a SIGHUP. If you edit the file on a running system, you have 
# to SIGHUP the postmaster for the changes to take effect, or use 
# "pg_ctl reload". Some settings, such as listen_address, require
# a postmaster shutdown and restart to take effect.


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

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

# data_directory = 'ConfigDir'		# use data in another directory
# hba_file = 'ConfigDir/pg_hba.conf'	# the host-based authentication file
# ident_file = 'ConfigDir/pg_ident.conf'  # the IDENT configuration file

# If external_pid_file is not explicitly set, no extra pid file is written.
# external_pid_file = '(none)'		# write an extra pid file


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

# - Connection Settings -

#listen_addresses = 'localhost'	# what IP interface(s) to listen on; 
				# defaults to localhost, '*' = any
#port = 5432
#max_connections = 100	# note: increasing max_connections costs about 500
			# bytes of shared memory per connection slot, in
			# addition to costs from shared_buffers and
			# max_locks_per_transaction.
#superuser_reserved_connections = 2
#unix_socket_directory = ''
#unix_socket_group = ''
#unix_socket_permissions = 0777	# octal
#bonjour_name = ''		# defaults to the computer name

# - Security & Authentication -

#authentication_timeout = 60	# 1-600, in seconds
#ssl = off
#password_encryption = on
#db_user_namespace = off
# Kerberos
#krb_server_keyfile = ''
#krb_caseins_users = off
#krb_srvname = 'postgres'

# - TCP Keepalives -
# see 'man 7 tcp' for details
#tcp_keepalives_idle = 0        # TCP_KEEPIDLE, in seconds; 0 uses the system default.
#tcp_keepalives_interval = 0    # TCP_KEEPINTVL, in seconds; 0 uses the system default.
#tcp_keepalives_count = 0       # TCP_KEEPCNT, in seconds; 0 uses the system default.

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

# - Memory -

#shared_buffers = 1000		# min 16, minimum max_connections*2, 8KB each
#temp_buffers = 1000		# min 100, 8KB each
#max_prepared_transactions = 50 # 0-10000
#work_mem = 1024		# min 64, size in KB
#maintenance_work_mem = 16384	# min 1024, size in KB
#max_stack_depth = 2048		# min 100, size in KB

# - Free Space Map -

#max_fsm_pages = 20000		# min max_fsm_relations*16, 6 bytes each
#max_fsm_relations = 1000	# min 100, ~50 bytes each

# - Kernel Resource Usage -

#max_files_per_process = 1000	# min 25
#preload_libraries = ''

# - Cost-Based Vacuum Delay -

#vacuum_cost_delay = 0		# 0-1000 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	# 0-10000 credits

# - Background writer -

#bgwriter_delay = 200		# 10-10000 milliseconds between rounds
#bgwriter_lru_percent = 1.0	# 0-100% of LRU buffers scanned in each round
#bgwriter_lru_maxpages = 5	# 0-1000 buffers max written per round
#bgwriter_all_percent = 0.333	# 0-100% of all buffers scanned in each round
#bgwriter_all_maxpages = 5	# 0-1000 buffers max written per round


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

# - Settings -

#fsync = on			# turns forced synchronization on or off
#wal_sync_method = fsync	# the default is the first option supported
				# by the operating system:  open_datasync, 
				# fdatasync, fsync, fsync_writethrough, 
				# open_sync
#full_page_writes = on		# recover from partial page writes
#wal_buffers = 8		# min 4, 8KB each
#commit_delay = 0		# range 0-100000, in microseconds
#commit_siblings = 5		# range 1-1000

# - Checkpoints -

#checkpoint_segments = 3	# in logfile segments, min 1, 16MB each
#checkpoint_timeout = 300	# range 30-3600, in seconds
#checkpoint_warning = 30	# 0 is off, in seconds

# - Archiving -

#archive_command = ''		# command to use to archive a logfile segment


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

# - Planner Method Configuration -

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

# - Planner Cost Constants -

#effective_cache_size = 1000	# typically 8KB each
#random_page_cost = 4		# units are one sequential page fetch cost
#cpu_tuple_cost = 0.01		# (same)
#cpu_index_tuple_cost = 0.001	# (same)
#cpu_operator_cost = 0.0025	# (same)

# - 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

# - Other Planner Options -

#default_statistics_target = 10	# range 1-1000
#enable_constraint_exclusion = off
#from_collapse_limit = 8
#join_collapse_limit = 8	# 1 disables collapsing of explicit JOINs


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

# - Where to Log -

#log_destination = 'stderr'	# Valid values are combinations of stderr,
                                # syslog and eventlog, depending on
                                # platform.

# This is used when logging to stderr:
#redirect_stderr = off		# Enable capturing of stderr into log files.

# These are only used if redirect_stderr is on:
#log_directory = 'pg_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_truncate_on_rotation = off # If on, any existing log file of 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 = 1440	# Automatic rotation of logfiles will happen 
				# after so many minutes.  0 to disable.
#log_rotation_size = 10240	# Automatic rotation of logfiles will happen
				# afterso many kilobytes of log output.  
				# 0 to disable.

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


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

#log_error_verbosity = default	# terse, default, or verbose messages

#log_min_error_statement = panic # Values in order of increasing severity:
				 #   debug5, debug4, debug3, debug2, debug1,
				 #   info, notice, warning, error, panic(off)
				 
#log_min_duration_statement = -1 # -1 is disabled, 0 logs all statements
				 # and their durations, in milliseconds.

#silent_mode = off		 # DO NOT USE without syslog or redirect_stderr

# - What to Log -

#debug_print_parse = off
#debug_print_rewritten = off
#debug_print_plan = off
#debug_pretty_print = off
#log_connections = off
#log_disconnections = off
#log_duration = off
#log_line_prefix = ''		# %u = user name
				# %d = database name
				# %r = remote host and port
				# %h = remote host
				# %p = PID
				# %t = timestamp (no milliseconds)
				# %m = timestamp with milliseconds
				# %i = command tag
				# %c = session id
				# %l = session line number
				# %s = session start timestamp
				# %x = transaction id
				# %q = stop here in non-session processes
				# %% = '%'
				# e.g. '<%u%%%d> '
#log_statement = 'none'		# none, mod, ddl, all
#log_hostname = off


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

# - Statistics Monitoring -

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

# - Query/Index Statistics Collector -

#stats_start_collector = on
#stats_command_string = off
#stats_block_level = off
#stats_row_level = off
#stats_reset_on_server_start = off


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

#autovacuum = false		# enable autovacuum subprocess?
#autovacuum_naptime = 60	# time between autovacuum runs, in seconds
#autovacuum_vacuum_threshold = 1000	# min # of tuple updates before vacuum
#autovacuum_analyze_threshold = 500	# min # of tuple updates before analyze
#autovacuum_vacuum_scale_factor = 0.4	# fraction of rel size before vacuum
#autovacuum_analyze_scale_factor = 0.2	# fraction of rel size before analyze
#autovacuum_vacuum_cost_delay = -1  # default vacuum cost delay for autovac
                                    # -1 means use vacuum_cost_delay
#autovacuum_vacuum_cost_limit = -1  # default vacuum cost limit for autovac
                                    # -1 means use vacuum_cost_limit


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

# - Statement Behavior -

#search_path = '$user,public'	# schema names
#default_tablespace = ''	# a tablespace name, or '' for default
#check_function_bodies = on
#default_transaction_isolation = 'read committed'
#default_transaction_read_only = off
#statement_timeout = 0		# 0 is disabled, in milliseconds

# - Locale and Formatting -

#datestyle = 'iso, mdy'
#timezone = unknown		# actually, defaults to TZ environment setting
#australian_timezones = off
#extra_float_digits = 0		# min -15, max 2
#client_encoding = sql_ascii	# actually, defaults to database encoding

# These settings are initialized by initdb -- they might 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

# - Other Defaults -

#explain_pretty_print = on
#dynamic_library_path = '$libdir'


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

#deadlock_timeout = 1000	# in milliseconds
#max_locks_per_transaction = 64	# min 10, ~200*max_connections bytes each


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

# - Previous Postgres Versions -

#add_missing_from = off
#regex_flavor = advanced	# advanced, extended, or basic
#sql_inheritance = on
#default_with_oids = off
#escape_string_warning = off

# - Other Platforms & Clients -

#transform_null_equals = off