From: lionel duboeuf <lionel.duboeuf@boozter.com>
Cc: pgsql-performance@postgresql.org
Subject: Re: Almost infinite query -> Different Query Plan when changing where clause value
Date: Fri, 12 Feb 2010 21:32:30 +0100
Message-ID: <4B75BADE.9030906@boozter.com> (raw)
In-Reply-To: <4B7519C5020000250002F242@gw.wicourts.gov>
References: <4B755913.7090004@boozter.com>
<4B7519C5020000250002F242@gw.wicourts.gov>
Thanks kevin for your answer. Here is some additionnal informations
attached as files.
regards.
Lionel
Kevin Grittner a écrit :
> lionel duboeuf <lionel.duboeuf@boozter.com> wrote:
>
>
>> Some informations:
>> The following problem has been detected on
>> Postgresql 8.3 and 8.4. on System linux or windows
>> Default AutoVacuum daemon working
>> One pg_dump every day
>> This happens sometimes and i don't see what can be the cause.
>> A manual Vacuum Analyse repair that problem.
>>
>
> It's good to know that the issue has been observed in more than one
> release or on more than one platform, but it's also useful to get a
> bit more information about one particular occurrence. Please read
> this:
>
> http://wiki.postgresql.org/wiki/SlowQueryQuestions
>
> In particular, knowing such things as your postgresql.conf settings,
> the disk configuration, how much RAM the machine has, etc. can allow
> us to provide more useful advice.
>
> Please run these as EXPLAIN ANALYZE (or at least whatever you can
> get to finish that way) instead of just EXPLAIN. If you can let the
> slow one run through EXPLAIN ANALYZE overnight or on a test machine
> so that it can complete, it will give us a lot more with which to
> work. Please attach wide output (like that from EXPLAIN) as a text
> attachment, to prevent wrapping which makes it hard to read.
>
> -Kevin
>
Attachments:cpuinfo (text/plain, 1.4K) download
processor : 0
vendor_id : GenuineIntel
cpu family : 6
model : 15
model name : Intel(R) Core(TM)2 Duo CPU T7500 @ 2.20GHz
stepping : 11
cpu MHz : 2201.000
cache size : 4096 KB
physical id : 0
siblings : 2
core id : 0
cpu cores : 2
apicid : 0
initial apicid : 0
fdiv_bug : no
hlt_bug : no
f00f_bug : no
coma_bug : no
fpu : yes
fpu_exception : yes
cpuid level : 10
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe nx lm constant_tsc arch_perfmon pebs bts pni dtes64 monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr pdcm lahf_lm ida tpr_shadow vnmi flexpriority
bogomips : 4389.59
clflush size : 64
power management:
processor : 1
vendor_id : GenuineIntel
cpu family : 6
model : 15
model name : Intel(R) Core(TM)2 Duo CPU T7500 @ 2.20GHz
stepping : 11
cpu MHz : 2201.000
cache size : 4096 KB
physical id : 0
siblings : 2
core id : 1
cpu cores : 2
apicid : 1
initial apicid : 1
fdiv_bug : no
hlt_bug : no
f00f_bug : no
coma_bug : no
fpu : yes
fpu_exception : yes
cpuid level : 10
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe nx lm constant_tsc arch_perfmon pebs bts pni dtes64 monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr pdcm lahf_lm ida tpr_shadow vnmi flexpriority
bogomips : 4388.96
clflush size : 64
power management:
explain_analyse.txt (text/plain, 5.1K) download
QUERY PLAN
Nested Loop (cost=58.71..1512.50 rows=1 width=16) (actual time=1.849..535681.136 rows=14 loops=1)
-> Nested Loop (cost=58.71..1506.60 rows=1 width=20) (actual time=1.839..535680.377 rows=14 loops=1)
Join Filter: (link0_.element_source = blocks9_.element_seqnum)
-> Nested Loop (cost=58.71..1498.29 rows=1 width=32) (actual time=1.819..535337.910 rows=6534 loops=1)
-> Nested Loop (cost=58.71..1497.14 rows=1 width=28) (actual time=1.811..535246.825 rows=6534 loops=1)
-> Nested Loop (cost=58.71..1488.83 rows=1 width=36) (actual time=1.800..535160.718 rows=6534 loops=1)
-> Nested Loop (cost=58.71..1484.40 rows=1 width=28) (actual time=1.772..535042.549 rows=6534 loops=1)
-> Nested Loop (cost=13.20..1434.87 rows=1 width=16) (actual time=1.398..8327.567 rows=122850 loops=1)
-> Nested Loop (cost=13.20..1428.97 rows=1 width=20) (actual time=1.387..1911.520 rows=122850 loops=1)
-> Nested Loop (cost=13.20..1427.83 rows=1 width=24) (actual time=1.374..517.662 rows=122850 loops=1)
-> Nested Loop (cost=0.00..16.63 rows=1 width=16) (actual time=0.085..0.409 rows=15 loops=1)
-> Index Scan using fki_element_block_block on element_block blocks7_ (cost=0.00..8.30 rows=1 width=8) (actual time=0.045..0.082 rows=15 loops=1)
Index Cond: (block_seqnum = 5)
-> Index Scan using pk_user_element on user_element users3_ (cost=0.00..8.33 rows=1 width=8) (actual time=0.012..0.015 rows=1 loops=15)
Index Cond: ((users3_.user_seqnum = 10) AND (users3_.element_seqnum = blocks7_.element_seqnum))
-> Bitmap Heap Scan on user_element users5_ (cost=13.20..1404.85 rows=634 width=8) (actual time=1.091..12.478 rows=8190 loops=15)
Recheck Cond: (users5_.user_seqnum = 10)
-> Bitmap Index Scan on fki_user_element_user (cost=0.00..13.05 rows=634 width=0) (actual time=1.062..1.062 rows=8194 loops=15)
Index Cond: (users5_.user_seqnum = 10)
-> Seq Scan on block block8_ (cost=0.00..1.14 rows=1 width=4) (actual time=0.004..0.005 rows=1 loops=122850)
Filter: (block8_.block_seqnum = 5)
-> Seq Scan on "user" user4_ (cost=0.00..5.89 rows=1 width=4) (actual time=0.005..0.047 rows=1 loops=122850)
Filter: (user4_.user_seqnum = 10)
-> Bitmap Heap Scan on link link0_ (cost=45.50..49.51 rows=1 width=12) (actual time=4.283..4.283 rows=0 loops=122850)
Recheck Cond: ((link0_.element_source = users5_.element_seqnum) AND (link0_.element_target = users3_.element_seqnum))
Filter: (link0_.link_sup_date IS NULL)
-> BitmapAnd (cost=45.50..45.50 rows=1 width=0) (actual time=4.280..4.280 rows=0 loops=122850)
-> Bitmap Index Scan on element_source_fk (cost=0.00..4.61 rows=21 width=0) (actual time=0.007..0.007 rows=6 loops=122850)
Index Cond: (link0_.element_source = users5_.element_seqnum)
-> Bitmap Index Scan on element_target_fk (cost=0.00..40.12 rows=2089 width=0) (actual time=4.719..4.719 rows=33814 loops=110880)
Index Cond: (link0_.element_target = users3_.element_seqnum)
-> Index Scan using pk_element on element element2_ (cost=0.00..4.41 rows=1 width=8) (actual time=0.009..0.011 rows=1 loops=6534)
Index Cond: (element2_.element_seqnum = link0_.element_source)
-> Index Scan using pk_element on element element1_ (cost=0.00..8.31 rows=1 width=4) (actual time=0.006..0.007 rows=1 loops=6534)
Index Cond: (element1_.element_seqnum = link0_.element_target)
-> Seq Scan on block block10_ (cost=0.00..1.14 rows=1 width=4) (actual time=0.005..0.007 rows=1 loops=6534)
Filter: (block10_.block_seqnum = 5)
-> Index Scan using fki_element_block_block on element_block blocks9_ (cost=0.00..8.30 rows=1 width=8) (actual time=0.007..0.030 rows=15 loops=6534)
Index Cond: (blocks9_.block_seqnum = 5)
-> Seq Scan on "user" user6_ (cost=0.00..5.89 rows=1 width=4) (actual time=0.006..0.048 rows=1 loops=14)
Filter: (user6_.user_seqnum = 10)
Total runtime: 535681.414 ms
meminfo (text/plain, 1.1K) download
MemTotal: 3087448 kB
MemFree: 2355500 kB
Buffers: 22212 kB
Cached: 396520 kB
SwapCached: 0 kB
Active: 387472 kB
Inactive: 289388 kB
Active(anon): 313808 kB
Inactive(anon): 0 kB
Active(file): 73664 kB
Inactive(file): 289388 kB
Unevictable: 0 kB
Mlocked: 0 kB
HighTotal: 2226696 kB
HighFree: 1560912 kB
LowTotal: 860752 kB
LowFree: 794588 kB
SwapTotal: 0 kB
SwapFree: 0 kB
Dirty: 6216 kB
Writeback: 0 kB
AnonPages: 258144 kB
Mapped: 127688 kB
Slab: 28196 kB
SReclaimable: 14624 kB
SUnreclaim: 13572 kB
PageTables: 5272 kB
NFS_Unstable: 0 kB
Bounce: 0 kB
WritebackTmp: 0 kB
CommitLimit: 1543724 kB
Committed_AS: 913152 kB
VmallocTotal: 122880 kB
VmallocUsed: 11192 kB
VmallocChunk: 88472 kB
HugePages_Total: 0
HugePages_Free: 0
HugePages_Rsvd: 0
HugePages_Surp: 0
Hugepagesize: 4096 kB
DirectMap4k: 16376 kB
DirectMap4M: 892928 kB
postgresql.conf (text/plain, 16.3K) download
# -----------------------------
# 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 paramters can be changed at run time
# with the "SET" SQL command.
#
# Memory units: kB = kilobytes MB = megabytes GB = gigabytes
# Time units: ms = milliseconds s = seconds 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/8.3/main' # use data in another directory
# (change requires restart)
hba_file = '/etc/postgresql/8.3/main/pg_hba.conf' # host-based authentication file
# (change requires restart)
ident_file = '/etc/postgresql/8.3/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/8.3-main.pid' # 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', '*' = all
# (change requires restart)
port = 5432 # (change requires restart)
max_connections = 100 # (change requires restart)
# Note: Increasing max_connections costs ~400 bytes of shared memory per
# connection slot, plus lock space (see max_locks_per_transaction). You might
# also need to raise shared_buffers to support more connections.
#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_name = '' # defaults to the computer name
# (change requires restart)
# - Security and Authentication -
#authentication_timeout = 1min # 1s-600s
ssl = true # (change requires restart)
#ssl_ciphers = 'ALL:!ADH:!LOW:!EXP:!MD5:@STRENGTH' # allowed SSL ciphers
# (change requires restart)
#password_encryption = on
#db_user_namespace = off
# Kerberos and GSSAPI
#krb_server_keyfile = '' # (change requires restart)
#krb_srvname = 'postgres' # (change requires restart, Kerberos only)
#krb_server_hostname = '' # empty string matches any keytab entry
# (change requires restart, Kerberos only)
#krb_caseins_users = off # (change requires restart)
#krb_realm = '' # (change requires restart)
# - 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 = 24MB # min 128kB or max_connections*16kB
# (change requires restart)
#temp_buffers = 8MB # min 800kB
#max_prepared_transactions = 5 # can be 0 or more
# (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).
#work_mem = 1MB # min 64kB
#maintenance_work_mem = 16MB # min 1MB
#max_stack_depth = 2MB # min 100kB
# - Free Space Map -
max_fsm_pages = 153600 # min max_fsm_relations*16, 6 bytes each
# (change requires restart)
#max_fsm_relations = 1000 # min 100, ~70 bytes each
# (change requires restart)
# - 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 # 0-1000 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 # 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
#------------------------------------------------------------------------------
# WRITE AHEAD LOG
#------------------------------------------------------------------------------
# - Settings -
#fsync = on # turns forced synchronization on or off
#synchronous_commit = on # immediate fsync at commit
#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 = 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 = 3 # in logfile segments, min 1, 16MB each
#checkpoint_timeout = 5min # range 30s-1h
#checkpoint_completion_target = 0.5 # checkpoint target duration, 0.0 - 1.0
#checkpoint_warning = 30s # 0 is off
# - 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
# time; 0 is off
#------------------------------------------------------------------------------
# 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 -
#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 = 128MB
# - 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
#constraint_exclusion = off
#from_collapse_limit = 8
#join_collapse_limit = 8 # 1 disables collapsing of explicit
# JOIN clauses
#------------------------------------------------------------------------------
# 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 = on # 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 to disable.
#log_rotation_size = 10MB # Automatic rotation of logfiles will
# happen after that much 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 = 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 = 100 # -1 is disabled, 0 logs all statements
# and their durations, > 0 logs only
# statements running at least this time.
#silent_mode = off # DO NOT USE without syslog or
# logging_collector
# (change requires restart)
# - What to Log -
#debug_print_parse = off
#debug_print_rewritten = off
#debug_print_plan = off
#debug_pretty_print = off
#log_checkpoints = off
#log_connections = off
#log_disconnections = off
#log_duration = off
#log_hostname = off
log_line_prefix = '%t ' # special values:
# %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
# %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_temp_files = -1 # log temporary files equal or larger
# than specified size;
# -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
#update_process_title = on
# - 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 that time.
#autovacuum_max_workers = 3 # max number of autovacuum subprocesses
#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 = 20 # default vacuum cost delay for
# autovacuum, -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 = '"$user",public' # schema names
#default_tablespace = '' # a tablespace name, '' uses the default
#temp_tablespaces = '' # a list of tablespace names, '' uses
# only default tablespace
#check_function_bodies = on
#default_transaction_isolation = 'read committed'
#default_transaction_read_only = off
#session_replication_role = 'origin'
#statement_timeout = 0 # 0 is disabled
#vacuum_freeze_min_age = 100000000
#xmlbinary = 'base64'
#xmloption = 'content'
# - Locale and Formatting -
datestyle = 'iso, dmy'
#timezone = unknown # actually, defaults to TZ environment
# setting
#timezone_abbreviations = 'Default' # Select the set of available time zone
# abbreviations. Currently, there are
# Default
# Australia
# India
# You can create your own file in
# share/timezonesets/.
#extra_float_digits = 0 # min -15, max 2
#client_encoding = sql_ascii # actually, defaults to database
# encoding
# These settings are initialized by initdb, but they can be changed.
lc_messages = 'fr_FR.UTF-8' # locale for system error message
# strings
lc_monetary = 'fr_FR.UTF-8' # locale for monetary formatting
lc_numeric = 'fr_FR.UTF-8' # locale for number formatting
lc_time = 'fr_FR.UTF-8' # locale for time formatting
# default configuration for text search
default_text_search_config = 'pg_catalog.french'
# - Other Defaults -
#explain_pretty_print = on
#dynamic_library_path = '$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 -
#add_missing_from = off
#array_nulls = on
#backslash_quote = safe_encoding # on, off, or safe_encoding
#default_with_oids = off
#escape_string_warning = on
#regex_flavor = advanced # advanced, extended, or basic
#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
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To: pgsql-performance@postgresql.org
Cc: lionel.duboeuf@boozter.com
Subject: Re: Almost infinite query -> Different Query Plan when changing where clause value
In-Reply-To: <4B75BADE.9030906@boozter.com>
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