BUG #8143: Backend segmentation fault in pg_trgm

The following bug has been logged on the website:

Bug reference: 8143
Logged by: Joel Roller
Email address: jroller(at)rjobrien(dot)com
PostgreSQL version: 9.2.4
Operating system: Debian 6.0.7 + squeeze-pgdg
Description:

Howdy.

We've come across a specific query and query plan that causes a repeatable
segmentation fault on the postgresql backend.

Thanks,
-joel

PostgreSQL 9.2.4 on x86_64-unknown-linux-gnu, compiled by gcc-4.4.real
(Debian 4.4.5-8) 4.4.5, 64-bit
from deb http://apt.postgresql.org/pub/repos/apt/ squeeze-pgdg main

-- System Information:
Debian Release: 6.0.7
APT prefers oldstable-updates
APT policy: (500, 'oldstable-updates'), (500, 'oldstable')
Architecture: amd64 (x86_64)

Kernel: Linux 2.6.32-5-amd64 (SMP w/1 CPU core)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash

Versions of packages postgresql-contrib-9.2 depends on:
ii libc6 2.11.3-4 Embedded GNU C Library: Shared
lib
ii libossp-uuid16 1.6.2-1 OSSP uuid ISO-C and C++ -
shared l
ii libpq5 9.2.4-1.pgdg60+1 PostgreSQL C client library
ii libssl0.9.8 0.9.8o-4squeeze14 SSL shared libraries
ii libxml2 2.7.8.dfsg-2+squeeze7 GNOME XML library
ii libxslt1.1 1.1.26-6+squeeze3 XSLT 1.0 processing library -
runt
ii postgresql-9.2 9.2.4-1.pgdg60+1 object-relational SQL database,
ve
ii zlib1g 1:1.2.3.4.dfsg-3 compression library - runtime

-- Crashing query:
select k.kw from keywords k, group_page_map gp
where gp.country = '99'
and gp.state is null and gp.city is null
and gp.group_id = k.group_id
and k.kw like 'AB%' and k.kw like 'ABCD%';
-- Output:
The connection to the server was lost. Attempting reset: Failed.
!>

QUERY PLAN

-----------------------------------------------------------------------------------------
Nested Loop (cost=0.00..137.43 rows=1 width=11)
Join Filter: (k.group_id = gp.group_id)
-> Seq Scan on group_page_map gp (cost=0.00..92.81 rows=1 width=4)
Filter: ((state IS NULL) AND (city IS NULL) AND ((country)::text =
'99'::text))
-> Index Scan using tgm_kw_crash on keywords k (cost=0.00..44.49
rows=10 width=15)
Index Cond: (((kw)::text ~~ 'AB%'::text) AND ((kw)::text ~~
'ABCD%'::text))

# gdb /usr/lib/postgresql/9.2/bin/postgres postgres-12458.core
GNU gdb (GDB) 7.3-debian
Copyright (C) 2011 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later
<http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law. Type "show copying"
and "show warranty" for details.
This GDB was configured as "x86_64-linux-gnu".
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>...
Reading symbols from /usr/lib/postgresql/9.2/bin/postgres...Reading symbols
from /usr/lib/debug/usr/lib/postgresql/9.2/bin/postgres...done.
done.
[New LWP 12458]

warning: Can't read pathname for load map: Input/output error.
[Thread debugging using libthread_db enabled]
Core was generated by `postgres: roller htcrash [local] SELECT
'.
Program terminated with signal 11, Segmentation fault.
#0 0x00007ff4b9d9b5a7 in pfree (pointer=0x7ff4bb377818) at
/tmp/buildd/postgresql-9.2-9.2.4/build/../src/backend/utils/mmgr/mcxt.c:659
659
/tmp/buildd/postgresql-9.2-9.2.4/build/../src/backend/utils/mmgr/mcxt.c: No
such file or directory.
in
/tmp/buildd/postgresql-9.2-9.2.4/build/../src/backend/utils/mmgr/mcxt.c
(gdb) bt
#0 0x00007ff4b9d9b5a7 in pfree (pointer=0x7ff4bb377818) at
/tmp/buildd/postgresql-9.2-9.2.4/build/../src/backend/utils/mmgr/mcxt.c:659
#1 0x00007ff4b2f93c79 in gtrgm_consistent (fcinfo=0x7fff759b7a40) at
/tmp/buildd/postgresql-9.2-9.2.4/build/../contrib/pg_trgm/trgm_gist.c:245
#2 0x00007ff4b9d81372 in FunctionCall5Coll (flinfo=0x7ff4bb377878,
collation=3140974616, arg1=<optimized out>, arg2=7088982889980756224,
arg3=140689089722480, arg4=140689089754640, arg5=140735166512862)
at
/tmp/buildd/postgresql-9.2-9.2.4/build/../src/backend/utils/fmgr/fmgr.c:1407
#3 0x00007ff4b9aa8955 in gistindex_keytest (recheck_p=<optimized out>,
offset=<optimized out>, page=<optimized out>, tuple=<optimized out>,
scan=<optimized out>)
at
/tmp/buildd/postgresql-9.2-9.2.4/build/../src/backend/access/gist/gistget.c:139
#4 gistScanPage (scan=<optimized out>, pageItem=<optimized out>,
myDistances=<optimized out>, tbm=<optimized out>, ntids=<optimized out>)
at
/tmp/buildd/postgresql-9.2-9.2.4/build/../src/backend/access/gist/gistget.c:312
#5 0x00007ff4b9aa9077 in gistgettuple (fcinfo=<optimized out>) at
/tmp/buildd/postgresql-9.2-9.2.4/build/../src/backend/access/gist/gistget.c:494
#6 0x00007ff4b9d81603 in FunctionCall2Coll (flinfo=0x7ff4bb377878,
collation=3140974616, arg1=0, arg2=7088982889980756224) at
/tmp/buildd/postgresql-9.2-9.2.4/build/../src/backend/utils/fmgr/fmgr.c:1326
#7 0x00007ff4b9ac1328 in index_getnext_tid (scan=0x7ff4bb372570,
direction=ForwardScanDirection) at
/tmp/buildd/postgresql-9.2-9.2.4/build/../src/backend/access/index/indexam.c:452
#8 0x00007ff4b9ac140a in index_getnext (scan=0x7ff4bb372570,
direction=ForwardScanDirection) at
/tmp/buildd/postgresql-9.2-9.2.4/build/../src/backend/access/index/indexam.c:593
#9 0x00007ff4b9be52b6 in IndexNext (node=0x7ff4bb370d00) at
/tmp/buildd/postgresql-9.2-9.2.4/build/../src/backend/executor/nodeIndexscan.c:78
#10 0x00007ff4b9bd9a8f in ExecScanFetch (recheckMtd=<optimized out>,
accessMtd=<optimized out>, node=<optimized out>) at
/tmp/buildd/postgresql-9.2-9.2.4/build/../src/backend/executor/execScan.c:82
#11 ExecScan (node=0x7ff4bb370d00, accessMtd=<optimized out>,
recheckMtd=<optimized out>) at
/tmp/buildd/postgresql-9.2-9.2.4/build/../src/backend/executor/execScan.c:132
#12 0x00007ff4b9bd21b8 in ExecProcNode (node=0x7ff4bb370d00) at
/tmp/buildd/postgresql-9.2-9.2.4/build/../src/backend/executor/execProcnode.c:403
#13 0x00007ff4b9bea1bc in ExecNestLoop (node=0x7ff4bb36e580) at
/tmp/buildd/postgresql-9.2-9.2.4/build/../src/backend/executor/nodeNestloop.c:174
#14 0x00007ff4b9bd2118 in ExecProcNode (node=0x7ff4bb36e580) at
/tmp/buildd/postgresql-9.2-9.2.4/build/../src/backend/executor/execProcnode.c:448
#15 0x00007ff4b9bd100a in ExecutePlan (dest=<optimized out>,
direction=<optimized out>, numberTuples=<optimized out>,
sendTuples=<optimized out>, operation=<optimized out>, planstate=<optimized
out>,
estate=<optimized out>) at
/tmp/buildd/postgresql-9.2-9.2.4/build/../src/backend/executor/execMain.c:1395
#16 standard_ExecutorRun (queryDesc=0x7ff4bb32ab20, direction=-1153992680,
count=0) at
/tmp/buildd/postgresql-9.2-9.2.4/build/../src/backend/executor/execMain.c:303
#17 0x00007ff4b9cb0837 in PortalRunSelect (portal=0x7ff4bb24cdf0,
forward=<optimized out>, count=0, dest=0x7ff4bb366628) at
/tmp/buildd/postgresql-9.2-9.2.4/build/../src/backend/tcop/pquery.c:944
#18 0x00007ff4b9cb1c80 in PortalRun (portal=<optimized out>,
count=<optimized out>, isTopLevel=<optimized out>, dest=<optimized out>,
altdest=<optimized out>, completionTag=<optimized out>)
at
/tmp/buildd/postgresql-9.2-9.2.4/build/../src/backend/tcop/pquery.c:788
#19 0x00007ff4b9cade0d in exec_simple_query (query_string=<optimized out>)
at
/tmp/buildd/postgresql-9.2-9.2.4/build/../src/backend/tcop/postgres.c:1046
#20 0x00007ff4b9caee00 in PostgresMain (argc=<optimized out>,
argv=<optimized out>, dbname=0x7ff4bb252458 "htcrash", username=<optimized
out>)
at
/tmp/buildd/postgresql-9.2-9.2.4/build/../src/backend/tcop/postgres.c:3959
#21 0x00007ff4b9c67cf3 in BackendRun (port=<optimized out>) at
/tmp/buildd/postgresql-9.2-9.2.4/build/../src/backend/postmaster/postmaster.c:3614
#22 BackendStartup (port=<optimized out>) at
/tmp/buildd/postgresql-9.2-9.2.4/build/../src/backend/postmaster/postmaster.c:3304
#23 ServerLoop () at
/tmp/buildd/postgresql-9.2-9.2.4/build/../src/backend/postmaster/postmaster.c:1367
#24 0x00007ff4b9c6ac8c in PostmasterMain (argc=<optimized out>,
argv=0x7ff4bb22c1c0) at
/tmp/buildd/postgresql-9.2-9.2.4/build/../src/backend/postmaster/postmaster.c:1127
#25 0x00007ff4b9c0638b in main (argc=5, argv=0x7ff4bb22c1a0) at
/tmp/buildd/postgresql-9.2-9.2.4/build/../src/backend/main/main.c:199

-- config postgresql.conf (not sure how much this matters, but may affect
query plan in use)
-- shared_buffers = 16MB

-- Create tables and data:
-- drop table keywords;
-- drop table group_page_map;

create table keywords (
kw varchar(20),
group_id integer,
meta1 text
);
create table group_page_map (
group_id integer,
country varchar(10),
state varchar(10),
city varchar(10)
);

-- Enough data to actually use indexes
insert into keywords (kw, group_id, meta1)
select rpad((num%10000)::text,10,'ABCDEFGHI'), num %
1000,rpad(num::text,800,'x')
from generate_series(1,100000) as num;
insert into keywords (kw, group_id, meta1)
select lpad(num::text,10,'ABCDEFGHI'), num % 10000,rpad(num::text,800,'x')
from generate_series(1,1000) as num;
insert into keywords (kw, group_id) values
('ABCDEFGHIJ',1),
('ABCDEFGHIJ',2),
('ABCDEFGHIJ',3);

-- Hierarchy data
insert into group_page_map (group_id, country, state, city)
select num % 100, num % 77, num % 171, num % 197
from generate_series(1,10000) as num;
-- A map with null state and city
insert into group_page_map (group_id, country) values
(3,99),(4, 99), (5,99),(6,99);

create index tgm_kw_crash on keywords using gist (kw gist_trgm_ops);
analyze keywords;

checkpoint;
-- End setup

-- Force crashy query plan
set enable_hashjoin=false;
set enable_bitmapscan=false;

-- This query crashes
select k.kw from keywords k, group_page_map gp
where gp.country = '99'
and gp.state is null and gp.city is null and gp.group_id = k.group_id
and k.kw like 'AB%' and k.kw like 'ABCD%';

-- postgresql.conf
# -----------------------------
# 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, or use "pg_ctl reload". 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
# 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 = '/var/lib/postgresql/9.2/main' # use data in another
directory
# (change requires restart)
hba_file = '/etc/postgresql/9.2/main/pg_hba.conf' # host-based
authentication file
# (change requires restart)
ident_file = '/etc/postgresql/9.2/main/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 = '/var/run/postgresql/9.2-main.pid' # write an extra PID
file
# (change requires restart)

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

# - Connection Settings -

listen_addresses = '*'
#listen_addresses = 'localhost' # what IP address(es) to listen on;
# comma-separated list of addresses;
# defaults to 'localhost', '*' = all
# (change requires restart)
port = 5432 # (change requires restart)
max_connections = 400 # (change requires restart)
# Note: Increasing max_connections costs ~400 bytes of shared memory per
# connection slot, plus lock space (see max_locks_per_transaction).
#superuser_reserved_connections = 3 # (change requires restart)
unix_socket_directory = '/var/run/postgresql' # (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 = false # (change requires restart)
#ssl_ciphers = 'ALL:!ADH:!LOW:!EXP:!MD5:@STRENGTH' # allowed SSL ciphers
# (change requires restart)
#ssl_renegotiation_limit = 512MB # amount of data between renegotiations
#password_encryption = on
#db_user_namespace = off

# Kerberos and GSSAPI
#krb_server_keyfile = ''
#krb_srvname = 'postgres' # (Kerberos only)
#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 = 16MB # min 128kB
# (change requires restart)
#temp_buffers = 8MB # min 800kB
#max_prepared_transactions = 0 # zero disables the feature
# (change requires restart)
# Note: Increasing max_prepared_transactions costs ~600 bytes of shared
memory
# per transaction slot, plus lock space (see max_locks_per_transaction).
# 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
#max_stack_depth = 2MB # min 100kB

# - 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 = 20ms # 0-100 milliseconds
vacuum_cost_page_hit = 1 # 0-10000 credits
vacuum_cost_page_miss = 20 # 0-10000 credits
vacuum_cost_page_dirty = 40 # 0-10000 credits
vacuum_cost_limit = 1000 # 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 multipler on buffers scanned/round

# - Asynchronous Behavior -

effective_io_concurrency = 1 # 1-1000. 0 disables prefetching

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

# - Settings -

#wal_level = minimal # minimal, archive, or hot_standby
# (change requires restart)
#fsync = on # turns forced synchronization on or off
synchronous_commit = off # immediate fsync at commit
#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_buffers = 64kB # min 32kB
# (change requires restart)
#wal_writer_delay = 200ms # 1-10000 milliseconds

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

# - Checkpoints -

checkpoint_segments = 30 # in logfile segments, min 1, 16MB each
checkpoint_timeout = 15min # range 30s-1h
#checkpoint_completion_target = 0.5 # checkpoint target duration, 0.0 - 1.0
#checkpoint_warning = 30s # 0 disables

# - Archiving -

#archive_mode = off # allows archiving to be done
# (change requires restart)
#archive_command = '' # command to use to archive a logfile segment
#archive_timeout = 0 # force a logfile segment switch after this
# number of seconds; 0 disables

# - Streaming Replication -

#max_wal_senders = 0 # max number of walsender processes
# (change requires restart)
#wal_sender_delay = 200ms # walsender cycle time, 1-10000 milliseconds
#wal_keep_segments = 0 # in logfile segments, 16MB each; 0 disables
#vacuum_defer_cleanup_age = 0 # number of xacts by which cleanup is delayed

# - Standby Servers -

#hot_standby = off # "on" allows 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

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

# - Planner Method Configuration -

#enable_bitmapscan = on
#enable_hashagg = on
#enable_hashjoin = on
#enable_indexscan = 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
effective_cache_size = 1256MB

# - 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

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

# - Where to Log -

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

# 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 = '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, an 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 = 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'

# - 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 = 250
#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 = '%t ' # 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
# %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_statement = 'none'
#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 = unknown # actually, defaults to TZ environment
# setting

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

# - Query/Index Statistics Collector -

track_activities = on
track_counts = on
track_functions = pl # none, pl, all
track_activity_query_size = 4096 # (change requires restart)
#update_process_title = on
#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 = 5000 # -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_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
#session_replication_role = 'origin'
#statement_timeout = 0 # in milliseconds, 0 is disabled
#vacuum_freeze_min_age = 50000000
#vacuum_freeze_table_age = 150000000
#bytea_output = 'hex' # hex, escape
#xmlbinary = 'base64'
#xmloption = 'content'

# - Locale and Formatting -

datestyle = 'iso, mdy'
#intervalstyle = 'postgres'
timezone = 'America/Chicago'

#timezone_abbreviations = 'Default' # Select the set of available time
zone
# abbreviations. Currently, there are
# Default
# Australia
# 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 = 'en_US.UTF-8' # locale for system error message
# strings
lc_monetary = 'en_US.UTF-8' # locale for monetary formatting
lc_numeric = 'en_US.UTF-8' # locale for number formatting
lc_time = 'en_US.UTF-8' # locale for time formatting

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

# - Other Defaults -

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

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

#deadlock_timeout = 1s
#max_locks_per_transaction = 64 # min 10
# (change requires restart)
# Note: Each lock table slot uses ~270 bytes of shared memory, and there
are
# max_locks_per_transaction * (max_connections + max_prepared_transactions)
# lock table slots.

#------------------------------------------------------------------------------
# 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
#sql_inheritance = on
#standard_conforming_strings = off
#synchronize_seqscans = on

# - Other Platforms and Clients -

#transform_null_equals = off

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

#custom_variable_classes = '' # list of custom variable class names
ssl_cert_file = '/etc/ssl/certs/ssl-cert-snakeoil.pem'
ssl_key_file = '/etc/ssl/private/ssl-cert-snakeoil.key'

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