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postgresql-9.2.24 /
html /
[ HOME SHELL ]
Name
Size
Permission
Action
LEGALNOTICE.html
2.62
KB
-rw-r--r--
acronyms.html
15.9
KB
-rw-r--r--
admin.html
12.27
KB
-rw-r--r--
adminpack.html
7.7
KB
-rw-r--r--
app-clusterdb.html
10.35
KB
-rw-r--r--
app-createdb.html
12.55
KB
-rw-r--r--
app-createlang.html
9.67
KB
-rw-r--r--
app-createuser.html
15.27
KB
-rw-r--r--
app-dropdb.html
9.42
KB
-rw-r--r--
app-droplang.html
9.41
KB
-rw-r--r--
app-dropuser.html
9.37
KB
-rw-r--r--
app-ecpg.html
8.51
KB
-rw-r--r--
app-initdb.html
15.04
KB
-rw-r--r--
app-pg-ctl.html
21.93
KB
-rw-r--r--
app-pg-dumpall.html
20.22
KB
-rw-r--r--
app-pgbasebackup.html
19.37
KB
-rw-r--r--
app-pgconfig.html
10.83
KB
-rw-r--r--
app-pgcontroldata.html
3.89
KB
-rw-r--r--
app-pgdump.html
42.93
KB
-rw-r--r--
app-pgreceivexlog.html
10.8
KB
-rw-r--r--
app-pgresetxlog.html
11.29
KB
-rw-r--r--
app-pgrestore.html
29.56
KB
-rw-r--r--
app-postgres.html
31.08
KB
-rw-r--r--
app-postmaster.html
2.93
KB
-rw-r--r--
app-psql.html
135.62
KB
-rw-r--r--
app-reindexdb.html
11.02
KB
-rw-r--r--
app-vacuumdb.html
12.32
KB
-rw-r--r--
appendixes.html
25.71
KB
-rw-r--r--
applevel-consistency.html
10.07
KB
-rw-r--r--
archive-recovery-settings.html
7.17
KB
-rw-r--r--
arrays.html
27.42
KB
-rw-r--r--
auth-delay.html
3.69
KB
-rw-r--r--
auth-methods.html
35.35
KB
-rw-r--r--
auth-pg-hba-conf.html
29.06
KB
-rw-r--r--
auth-username-maps.html
8.4
KB
-rw-r--r--
auto-explain.html
9.66
KB
-rw-r--r--
backup-dump.html
15.55
KB
-rw-r--r--
backup-file.html
7.81
KB
-rw-r--r--
backup.html
4.38
KB
-rw-r--r--
biblio.html
11.28
KB
-rw-r--r--
bki-commands.html
9.42
KB
-rw-r--r--
bki-example.html
2.98
KB
-rw-r--r--
bki-format.html
3.38
KB
-rw-r--r--
bki-structure.html
4.22
KB
-rw-r--r--
bki.html
4.23
KB
-rw-r--r--
bookindex.html
237.47
KB
-rw-r--r--
btree-gin.html
4.49
KB
-rw-r--r--
btree-gist.html
6.72
KB
-rw-r--r--
bug-reporting.html
18.21
KB
-rw-r--r--
catalog-pg-aggregate.html
5.37
KB
-rw-r--r--
catalog-pg-am.html
10.3
KB
-rw-r--r--
catalog-pg-amop.html
7.42
KB
-rw-r--r--
catalog-pg-amproc.html
4.77
KB
-rw-r--r--
catalog-pg-attrdef.html
4.26
KB
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catalog-pg-attribute.html
10.05
KB
-rw-r--r--
catalog-pg-auth-members.html
4.16
KB
-rw-r--r--
catalog-pg-authid.html
6.66
KB
-rw-r--r--
catalog-pg-cast.html
6.79
KB
-rw-r--r--
catalog-pg-class.html
12.36
KB
-rw-r--r--
catalog-pg-collation.html
5.76
KB
-rw-r--r--
catalog-pg-constraint.html
11.31
KB
-rw-r--r--
catalog-pg-conversion.html
4.33
KB
-rw-r--r--
catalog-pg-database.html
6.86
KB
-rw-r--r--
catalog-pg-db-role-setting.htm...
3.97
KB
-rw-r--r--
catalog-pg-default-acl.html
5.14
KB
-rw-r--r--
catalog-pg-depend.html
8.43
KB
-rw-r--r--
catalog-pg-description.html
4.37
KB
-rw-r--r--
catalog-pg-enum.html
4.61
KB
-rw-r--r--
catalog-pg-extension.html
5.16
KB
-rw-r--r--
catalog-pg-foreign-data-wrappe...
4.83
KB
-rw-r--r--
catalog-pg-foreign-server.html
4.58
KB
-rw-r--r--
catalog-pg-foreign-table.html
3.94
KB
-rw-r--r--
catalog-pg-index.html
8.66
KB
-rw-r--r--
catalog-pg-inherits.html
3.8
KB
-rw-r--r--
catalog-pg-language.html
5.81
KB
-rw-r--r--
catalog-pg-largeobject-metadat...
3.54
KB
-rw-r--r--
catalog-pg-largeobject.html
5.03
KB
-rw-r--r--
catalog-pg-namespace.html
3.66
KB
-rw-r--r--
catalog-pg-opclass.html
5.73
KB
-rw-r--r--
catalog-pg-operator.html
6.49
KB
-rw-r--r--
catalog-pg-opfamily.html
4.7
KB
-rw-r--r--
catalog-pg-pltemplate.html
5.24
KB
-rw-r--r--
catalog-pg-proc.html
13.09
KB
-rw-r--r--
catalog-pg-range.html
5.06
KB
-rw-r--r--
catalog-pg-rewrite.html
5.26
KB
-rw-r--r--
catalog-pg-seclabel.html
4.41
KB
-rw-r--r--
catalog-pg-shdepend.html
6.88
KB
-rw-r--r--
catalog-pg-shdescription.html
4.15
KB
-rw-r--r--
catalog-pg-shseclabel.html
4.3
KB
-rw-r--r--
catalog-pg-statistic.html
9.31
KB
-rw-r--r--
catalog-pg-tablespace.html
4.06
KB
-rw-r--r--
catalog-pg-trigger.html
8.09
KB
-rw-r--r--
catalog-pg-ts-config-map.html
4.09
KB
-rw-r--r--
catalog-pg-ts-config.html
4.38
KB
-rw-r--r--
catalog-pg-ts-dict.html
4.61
KB
-rw-r--r--
catalog-pg-ts-parser.html
4.96
KB
-rw-r--r--
catalog-pg-ts-template.html
4.16
KB
-rw-r--r--
catalog-pg-type.html
19.44
KB
-rw-r--r--
catalog-pg-user-mapping.html
3.76
KB
-rw-r--r--
catalogs-overview.html
10.19
KB
-rw-r--r--
catalogs.html
10.14
KB
-rw-r--r--
charset.html
4.06
KB
-rw-r--r--
chkpass.html
4.29
KB
-rw-r--r--
citext.html
10.89
KB
-rw-r--r--
client-authentication-problems...
4.13
KB
-rw-r--r--
client-authentication.html
5.78
KB
-rw-r--r--
client-interfaces.html
13.4
KB
-rw-r--r--
collation.html
13.89
KB
-rw-r--r--
config-setting.html
10.88
KB
-rw-r--r--
connect-estab.html
4.21
KB
-rw-r--r--
continuous-archiving.html
48.66
KB
-rw-r--r--
contrib-dblink-build-sql-delet...
5.32
KB
-rw-r--r--
contrib-dblink-build-sql-inser...
5.91
KB
-rw-r--r--
contrib-dblink-build-sql-updat...
6.13
KB
-rw-r--r--
contrib-dblink-cancel-query.ht...
3.73
KB
-rw-r--r--
contrib-dblink-close.html
4.54
KB
-rw-r--r--
contrib-dblink-connect-u.html
4.38
KB
-rw-r--r--
contrib-dblink-connect.html
7.15
KB
-rw-r--r--
contrib-dblink-disconnect.html
3.63
KB
-rw-r--r--
contrib-dblink-error-message.h...
3.43
KB
-rw-r--r--
contrib-dblink-exec.html
5.34
KB
-rw-r--r--
contrib-dblink-fetch.html
5.84
KB
-rw-r--r--
contrib-dblink-function.html
8.43
KB
-rw-r--r--
contrib-dblink-get-connections...
3.13
KB
-rw-r--r--
contrib-dblink-get-notify.html
4.07
KB
-rw-r--r--
contrib-dblink-get-pkey.html
4.39
KB
-rw-r--r--
contrib-dblink-get-result.html
6.8
KB
-rw-r--r--
contrib-dblink-is-busy.html
3.41
KB
-rw-r--r--
contrib-dblink-open.html
5.34
KB
-rw-r--r--
contrib-dblink-send-query.html
4.07
KB
-rw-r--r--
contrib-prog-client.html
3.35
KB
-rw-r--r--
contrib-prog-server.html
3.75
KB
-rw-r--r--
contrib-prog.html
3.24
KB
-rw-r--r--
contrib-spi.html
10.97
KB
-rw-r--r--
contrib.html
8.7
KB
-rw-r--r--
creating-cluster.html
12.17
KB
-rw-r--r--
cube.html
15.57
KB
-rw-r--r--
database-roles.html
5.95
KB
-rw-r--r--
datatype-binary.html
12.59
KB
-rw-r--r--
datatype-bit.html
4.98
KB
-rw-r--r--
datatype-boolean.html
5.14
KB
-rw-r--r--
datatype-character.html
11.61
KB
-rw-r--r--
datatype-datetime.html
49.57
KB
-rw-r--r--
datatype-enum.html
6.28
KB
-rw-r--r--
datatype-geometric.html
12.21
KB
-rw-r--r--
datatype-json.html
3.36
KB
-rw-r--r--
datatype-money.html
5.35
KB
-rw-r--r--
datatype-net-types.html
10.18
KB
-rw-r--r--
datatype-numeric.html
21.83
KB
-rw-r--r--
datatype-oid.html
9.46
KB
-rw-r--r--
datatype-pseudo.html
7.11
KB
-rw-r--r--
datatype-textsearch.html
9.8
KB
-rw-r--r--
datatype-uuid.html
4.45
KB
-rw-r--r--
datatype-xml.html
11.07
KB
-rw-r--r--
datatype.html
16.22
KB
-rw-r--r--
datetime-appendix.html
3.44
KB
-rw-r--r--
datetime-config-files.html
8.77
KB
-rw-r--r--
datetime-input-rules.html
6.6
KB
-rw-r--r--
datetime-keywords.html
4.98
KB
-rw-r--r--
datetime-units-history.html
7.46
KB
-rw-r--r--
dblink.html
5.2
KB
-rw-r--r--
ddl-alter.html
10.25
KB
-rw-r--r--
ddl-basics.html
7.63
KB
-rw-r--r--
ddl-constraints.html
22.26
KB
-rw-r--r--
ddl-default.html
4.43
KB
-rw-r--r--
ddl-depend.html
6.35
KB
-rw-r--r--
ddl-foreign-data.html
4.38
KB
-rw-r--r--
ddl-inherit.html
14.95
KB
-rw-r--r--
ddl-others.html
3.01
KB
-rw-r--r--
ddl-partitioning.html
27.11
KB
-rw-r--r--
ddl-priv.html
5.92
KB
-rw-r--r--
ddl-schemas.html
17.62
KB
-rw-r--r--
ddl-system-columns.html
7.86
KB
-rw-r--r--
ddl.html
6.23
KB
-rw-r--r--
dict-int.html
4.68
KB
-rw-r--r--
dict-xsyn.html
6.33
KB
-rw-r--r--
different-replication-solution...
14.45
KB
-rw-r--r--
disk-full.html
3.43
KB
-rw-r--r--
disk-usage.html
5.53
KB
-rw-r--r--
diskusage.html
2.61
KB
-rw-r--r--
dml-delete.html
3.48
KB
-rw-r--r--
dml-insert.html
5.67
KB
-rw-r--r--
dml-returning.html
4.98
KB
-rw-r--r--
dml-update.html
5.43
KB
-rw-r--r--
dml.html
2.88
KB
-rw-r--r--
docguide-authoring.html
6.6
KB
-rw-r--r--
docguide-build.html
14.92
KB
-rw-r--r--
docguide-docbook.html
3.76
KB
-rw-r--r--
docguide-style.html
7.25
KB
-rw-r--r--
docguide-toolsets.html
20.2
KB
-rw-r--r--
docguide.html
3.54
KB
-rw-r--r--
dummy-seclabel.html
4.26
KB
-rw-r--r--
dynamic-trace.html
26.6
KB
-rw-r--r--
earthdistance.html
8.6
KB
-rw-r--r--
ecpg-commands.html
9.3
KB
-rw-r--r--
ecpg-concept.html
4.86
KB
-rw-r--r--
ecpg-connect.html
10.57
KB
-rw-r--r--
ecpg-cpp.html
9.4
KB
-rw-r--r--
ecpg-descriptors.html
34.09
KB
-rw-r--r--
ecpg-develop.html
7.78
KB
-rw-r--r--
ecpg-dynamic.html
6.36
KB
-rw-r--r--
ecpg-errors.html
25.13
KB
-rw-r--r--
ecpg-informix-compat.html
51.52
KB
-rw-r--r--
ecpg-library.html
5.66
KB
-rw-r--r--
ecpg-lo.html
5.4
KB
-rw-r--r--
ecpg-pgtypes.html
53.18
KB
-rw-r--r--
ecpg-preproc.html
8.77
KB
-rw-r--r--
ecpg-process.html
5.26
KB
-rw-r--r--
ecpg-sql-allocate-descriptor.h...
3.89
KB
-rw-r--r--
ecpg-sql-commands.html
4.59
KB
-rw-r--r--
ecpg-sql-connect.html
9.16
KB
-rw-r--r--
ecpg-sql-deallocate-descriptor...
3.68
KB
-rw-r--r--
ecpg-sql-declare.html
5.27
KB
-rw-r--r--
ecpg-sql-describe.html
4.49
KB
-rw-r--r--
ecpg-sql-disconnect.html
4.62
KB
-rw-r--r--
ecpg-sql-execute-immediate.htm...
3.79
KB
-rw-r--r--
ecpg-sql-get-descriptor.html
7.53
KB
-rw-r--r--
ecpg-sql-open.html
4.53
KB
-rw-r--r--
ecpg-sql-prepare.html
4.08
KB
-rw-r--r--
ecpg-sql-set-autocommit.html
3.25
KB
-rw-r--r--
ecpg-sql-set-connection.html
3.84
KB
-rw-r--r--
ecpg-sql-set-descriptor.html
5.38
KB
-rw-r--r--
ecpg-sql-type.html
4.91
KB
-rw-r--r--
ecpg-sql-var.html
3.46
KB
-rw-r--r--
ecpg-sql-whenever.html
4.58
KB
-rw-r--r--
ecpg-variables.html
39.34
KB
-rw-r--r--
ecpg.html
10.1
KB
-rw-r--r--
encryption-options.html
7.32
KB
-rw-r--r--
errcodes-appendix.html
36.1
KB
-rw-r--r--
error-message-reporting.html
13.79
KB
-rw-r--r--
error-style-guide.html
16.38
KB
-rw-r--r--
event-log-registration.html
4.09
KB
-rw-r--r--
executor.html
6.46
KB
-rw-r--r--
explicit-joins.html
10.76
KB
-rw-r--r--
explicit-locking.html
24.49
KB
-rw-r--r--
extend-extensions.html
31.67
KB
-rw-r--r--
extend-how.html
4.45
KB
-rw-r--r--
extend-pgxs.html
11.49
KB
-rw-r--r--
extend-type-system.html
9.87
KB
-rw-r--r--
extend.html
9.75
KB
-rw-r--r--
external-admin-tools.html
2.66
KB
-rw-r--r--
external-extensions.html
3.19
KB
-rw-r--r--
external-interfaces.html
5.38
KB
-rw-r--r--
external-pl.html
4.56
KB
-rw-r--r--
external-projects.html
2.93
KB
-rw-r--r--
fdw-callbacks.html
12.6
KB
-rw-r--r--
fdw-functions.html
4.39
KB
-rw-r--r--
fdw-helpers.html
5.85
KB
-rw-r--r--
fdw-planning.html
9.61
KB
-rw-r--r--
fdwhandler.html
3.9
KB
-rw-r--r--
features-sql-standard.html
38.19
KB
-rw-r--r--
features.html
7.39
KB
-rw-r--r--
file-fdw.html
7.53
KB
-rw-r--r--
functions-admin.html
49.21
KB
-rw-r--r--
functions-aggregate.html
21.3
KB
-rw-r--r--
functions-array.html
13.2
KB
-rw-r--r--
functions-binarystring.html
12.29
KB
-rw-r--r--
functions-bitstring.html
6.63
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-rw-r--r--
functions-comparison.html
10.39
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-rw-r--r--
functions-comparisons.html
13.21
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-rw-r--r--
functions-conditional.html
10.75
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-rw-r--r--
functions-datetime.html
47.17
KB
-rw-r--r--
functions-enum.html
5.36
KB
-rw-r--r--
functions-formatting.html
34.57
KB
-rw-r--r--
functions-geometry.html
19.87
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-rw-r--r--
functions-info.html
57.28
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-rw-r--r--
functions-json.html
3.72
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functions-logical.html
4.56
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-rw-r--r--
functions-matching.html
73.95
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functions-math.html
19.92
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functions-net.html
13.19
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-rw-r--r--
functions-range.html
10.6
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-rw-r--r--
functions-sequence.html
12.62
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-rw-r--r--
functions-srf.html
8.63
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functions-string.html
57.67
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functions-subquery.html
16
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functions-textsearch.html
20.01
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functions-trigger.html
4.44
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functions-window.html
11.8
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functions-xml.html
31.42
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-rw-r--r--
functions.html
9.71
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-rw-r--r--
fuzzystrmatch.html
7.87
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geqo-biblio.html
3.38
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-rw-r--r--
geqo-intro.html
4.31
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-rw-r--r--
geqo-intro2.html
5.5
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-rw-r--r--
geqo-pg-intro.html
8.58
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-rw-r--r--
geqo.html
3.53
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-rw-r--r--
gin-examples.html
3.24
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-rw-r--r--
gin-extensibility.html
14.06
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-rw-r--r--
gin-implementation.html
6.41
KB
-rw-r--r--
gin-intro.html
4.55
KB
-rw-r--r--
gin-limit.html
2.75
KB
-rw-r--r--
gin-tips.html
5.58
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-rw-r--r--
gin.html
2.86
KB
-rw-r--r--
gist-examples.html
3.66
KB
-rw-r--r--
gist-extensibility.html
23.78
KB
-rw-r--r--
gist-implementation.html
4
KB
-rw-r--r--
gist-intro.html
3.53
KB
-rw-r--r--
gist.html
2.62
KB
-rw-r--r--
git.html
4.46
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-rw-r--r--
high-availability.html
7.52
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-rw-r--r--
history.html
11.64
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-rw-r--r--
hot-standby.html
35.2
KB
-rw-r--r--
hstore.html
22.1
KB
-rw-r--r--
index-catalog.html
7.81
KB
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index-cost-estimation.html
9.76
KB
-rw-r--r--
index-functions.html
18.67
KB
-rw-r--r--
index-locking.html
7.86
KB
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <HTML ><HEAD ><TITLE >Resource Consumption</TITLE ><META NAME="GENERATOR" CONTENT="Modular DocBook HTML Stylesheet Version 1.79"><LINK REV="MADE" HREF="mailto:pgsql-docs@postgresql.org"><LINK REL="HOME" TITLE="PostgreSQL 9.2.24 Documentation" HREF="index.html"><LINK REL="UP" TITLE="Server Configuration" HREF="runtime-config.html"><LINK REL="PREVIOUS" TITLE="Connections and Authentication" HREF="runtime-config-connection.html"><LINK REL="NEXT" TITLE="Write Ahead Log" HREF="runtime-config-wal.html"><LINK REL="STYLESHEET" TYPE="text/css" HREF="stylesheet.css"><META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=ISO-8859-1"><META NAME="creation" CONTENT="2017-11-06T22:43:11"></HEAD ><BODY CLASS="SECT1" ><DIV CLASS="NAVHEADER" ><TABLE SUMMARY="Header navigation table" WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" ><TR ><TH COLSPAN="5" ALIGN="center" VALIGN="bottom" ><A HREF="index.html" >PostgreSQL 9.2.24 Documentation</A ></TH ></TR ><TR ><TD WIDTH="10%" ALIGN="left" VALIGN="top" ><A TITLE="Connections and Authentication" HREF="runtime-config-connection.html" ACCESSKEY="P" >Prev</A ></TD ><TD WIDTH="10%" ALIGN="left" VALIGN="top" ><A HREF="runtime-config.html" ACCESSKEY="U" >Up</A ></TD ><TD WIDTH="60%" ALIGN="center" VALIGN="bottom" >Chapter 18. Server Configuration</TD ><TD WIDTH="20%" ALIGN="right" VALIGN="top" ><A TITLE="Write Ahead Log" HREF="runtime-config-wal.html" ACCESSKEY="N" >Next</A ></TD ></TR ></TABLE ><HR ALIGN="LEFT" WIDTH="100%"></DIV ><DIV CLASS="SECT1" ><H1 CLASS="SECT1" ><A NAME="RUNTIME-CONFIG-RESOURCE" >18.4. Resource Consumption</A ></H1 ><DIV CLASS="SECT2" ><H2 CLASS="SECT2" ><A NAME="RUNTIME-CONFIG-RESOURCE-MEMORY" >18.4.1. Memory</A ></H2 ><P ></P ><DIV CLASS="VARIABLELIST" ><DL ><DT ><A NAME="GUC-SHARED-BUFFERS" ></A ><TT CLASS="VARNAME" >shared_buffers</TT > (<TT CLASS="TYPE" >integer</TT >)</DT ><DD ><P > Sets the amount of memory the database server uses for shared memory buffers. The default is typically 32 megabytes (<TT CLASS="LITERAL" >32MB</TT >), but might be less if your kernel settings will not support it (as determined during <SPAN CLASS="APPLICATION" >initdb</SPAN >). This setting must be at least 128 kilobytes. (Non-default values of <TT CLASS="SYMBOL" >BLCKSZ</TT > change the minimum.) However, settings significantly higher than the minimum are usually needed for good performance. This parameter can only be set at server start. </P ><P > If you have a dedicated database server with 1GB or more of RAM, a reasonable starting value for <TT CLASS="VARNAME" >shared_buffers</TT > is 25% of the memory in your system. There are some workloads where even large settings for <TT CLASS="VARNAME" >shared_buffers</TT > are effective, but because <SPAN CLASS="PRODUCTNAME" >PostgreSQL</SPAN > also relies on the operating system cache, it is unlikely that an allocation of more than 40% of RAM to <TT CLASS="VARNAME" >shared_buffers</TT > will work better than a smaller amount. Larger settings for <TT CLASS="VARNAME" >shared_buffers</TT > usually require a corresponding increase in <TT CLASS="VARNAME" >checkpoint_segments</TT >, in order to spread out the process of writing large quantities of new or changed data over a longer period of time. </P ><P > On systems with less than 1GB of RAM, a smaller percentage of RAM is appropriate, so as to leave adequate space for the operating system. Also, on Windows, large values for <TT CLASS="VARNAME" >shared_buffers</TT > aren't as effective. You may find better results keeping the setting relatively low and using the operating system cache more instead. The useful range for <TT CLASS="VARNAME" >shared_buffers</TT > on Windows systems is generally from 64MB to 512MB. </P ><P > Increasing this parameter might cause <SPAN CLASS="PRODUCTNAME" >PostgreSQL</SPAN > to request more <SPAN CLASS="SYSTEMITEM" >System V</SPAN > shared memory than your operating system's default configuration allows. See <A HREF="kernel-resources.html#SYSVIPC" >Section 17.4.1</A > for information on how to adjust those parameters, if necessary. </P ></DD ><DT ><A NAME="GUC-TEMP-BUFFERS" ></A ><TT CLASS="VARNAME" >temp_buffers</TT > (<TT CLASS="TYPE" >integer</TT >)</DT ><DD ><P > Sets the maximum number of temporary buffers used by each database session. These are session-local buffers used only for access to temporary tables. The default is eight megabytes (<TT CLASS="LITERAL" >8MB</TT >). The setting can be changed within individual sessions, but only before the first use of temporary tables within the session; subsequent attempts to change the value will have no effect on that session. </P ><P > A session will allocate temporary buffers as needed up to the limit given by <TT CLASS="VARNAME" >temp_buffers</TT >. The cost of setting a large value in sessions that do not actually need many temporary buffers is only a buffer descriptor, or about 64 bytes, per increment in <TT CLASS="VARNAME" >temp_buffers</TT >. However if a buffer is actually used an additional 8192 bytes will be consumed for it (or in general, <TT CLASS="SYMBOL" >BLCKSZ</TT > bytes). </P ></DD ><DT ><A NAME="GUC-MAX-PREPARED-TRANSACTIONS" ></A ><TT CLASS="VARNAME" >max_prepared_transactions</TT > (<TT CLASS="TYPE" >integer</TT >)</DT ><DD ><P > Sets the maximum number of transactions that can be in the <SPAN CLASS="QUOTE" >"prepared"</SPAN > state simultaneously (see <A HREF="sql-prepare-transaction.html" >PREPARE TRANSACTION</A >). Setting this parameter to zero (which is the default) disables the prepared-transaction feature. This parameter can only be set at server start. </P ><P > If you are not planning to use prepared transactions, this parameter should be set to zero to prevent accidental creation of prepared transactions. If you are using prepared transactions, you will probably want <TT CLASS="VARNAME" >max_prepared_transactions</TT > to be at least as large as <A HREF="runtime-config-connection.html#GUC-MAX-CONNECTIONS" >max_connections</A >, so that every session can have a prepared transaction pending. </P ><P > Increasing this parameter might cause <SPAN CLASS="PRODUCTNAME" >PostgreSQL</SPAN > to request more <SPAN CLASS="SYSTEMITEM" >System V</SPAN > shared memory than your operating system's default configuration allows. See <A HREF="kernel-resources.html#SYSVIPC" >Section 17.4.1</A > for information on how to adjust those parameters, if necessary. </P ><P > When running a standby server, you must set this parameter to the same or higher value than on the master server. Otherwise, queries will not be allowed in the standby server. </P ></DD ><DT ><A NAME="GUC-WORK-MEM" ></A ><TT CLASS="VARNAME" >work_mem</TT > (<TT CLASS="TYPE" >integer</TT >)</DT ><DD ><P > Specifies the amount of memory to be used by internal sort operations and hash tables before writing to temporary disk files. The value defaults to one megabyte (<TT CLASS="LITERAL" >1MB</TT >). Note that for a complex query, several sort or hash operations might be running in parallel; each operation will be allowed to use as much memory as this value specifies before it starts to write data into temporary files. Also, several running sessions could be doing such operations concurrently. Therefore, the total memory used could be many times the value of <TT CLASS="VARNAME" >work_mem</TT >; it is necessary to keep this fact in mind when choosing the value. Sort operations are used for <TT CLASS="LITERAL" >ORDER BY</TT >, <TT CLASS="LITERAL" >DISTINCT</TT >, and merge joins. Hash tables are used in hash joins, hash-based aggregation, and hash-based processing of <TT CLASS="LITERAL" >IN</TT > subqueries. </P ></DD ><DT ><A NAME="GUC-MAINTENANCE-WORK-MEM" ></A ><TT CLASS="VARNAME" >maintenance_work_mem</TT > (<TT CLASS="TYPE" >integer</TT >)</DT ><DD ><P > Specifies the maximum amount of memory to be used by maintenance operations, such as <TT CLASS="COMMAND" >VACUUM</TT >, <TT CLASS="COMMAND" >CREATE INDEX</TT >, and <TT CLASS="COMMAND" >ALTER TABLE ADD FOREIGN KEY</TT >. It defaults to 16 megabytes (<TT CLASS="LITERAL" >16MB</TT >). Since only one of these operations can be executed at a time by a database session, and an installation normally doesn't have many of them running concurrently, it's safe to set this value significantly larger than <TT CLASS="VARNAME" >work_mem</TT >. Larger settings might improve performance for vacuuming and for restoring database dumps. </P ><P > Note that when autovacuum runs, up to <A HREF="runtime-config-autovacuum.html#GUC-AUTOVACUUM-MAX-WORKERS" >autovacuum_max_workers</A > times this memory may be allocated, so be careful not to set the default value too high. </P ></DD ><DT ><A NAME="GUC-MAX-STACK-DEPTH" ></A ><TT CLASS="VARNAME" >max_stack_depth</TT > (<TT CLASS="TYPE" >integer</TT >)</DT ><DD ><P > Specifies the maximum safe depth of the server's execution stack. The ideal setting for this parameter is the actual stack size limit enforced by the kernel (as set by <TT CLASS="LITERAL" >ulimit -s</TT > or local equivalent), less a safety margin of a megabyte or so. The safety margin is needed because the stack depth is not checked in every routine in the server, but only in key potentially-recursive routines such as expression evaluation. The default setting is two megabytes (<TT CLASS="LITERAL" >2MB</TT >), which is conservatively small and unlikely to risk crashes. However, it might be too small to allow execution of complex functions. Only superusers can change this setting. </P ><P > Setting <TT CLASS="VARNAME" >max_stack_depth</TT > higher than the actual kernel limit will mean that a runaway recursive function can crash an individual backend process. On platforms where <SPAN CLASS="PRODUCTNAME" >PostgreSQL</SPAN > can determine the kernel limit, the server will not allow this variable to be set to an unsafe value. However, not all platforms provide the information, so caution is recommended in selecting a value. </P ></DD ></DL ></DIV ></DIV ><DIV CLASS="SECT2" ><H2 CLASS="SECT2" ><A NAME="RUNTIME-CONFIG-RESOURCE-DISK" >18.4.2. Disk</A ></H2 ><P ></P ><DIV CLASS="VARIABLELIST" ><DL ><DT ><A NAME="GUC-TEMP-FILE-LIMIT" ></A ><TT CLASS="VARNAME" >temp_file_limit</TT > (<TT CLASS="TYPE" >integer</TT >)</DT ><DD ><P > Specifies the maximum amount of disk space that a session can use for temporary files, such as sort and hash temporary files, or the storage file for a held cursor. A transaction attempting to exceed this limit will be cancelled. The value is specified in kilobytes, and <TT CLASS="LITERAL" >-1</TT > (the default) means no limit. Only superusers can change this setting. </P ><P > This setting constrains the total space used at any instant by all temporary files used by a given <SPAN CLASS="PRODUCTNAME" >PostgreSQL</SPAN > session. It should be noted that disk space used for explicit temporary tables, as opposed to temporary files used behind-the-scenes in query execution, does <SPAN CLASS="emphasis" ><I CLASS="EMPHASIS" >not</I ></SPAN > count against this limit. </P ></DD ></DL ></DIV ></DIV ><DIV CLASS="SECT2" ><H2 CLASS="SECT2" ><A NAME="RUNTIME-CONFIG-RESOURCE-KERNEL" >18.4.3. Kernel Resource Usage</A ></H2 ><P ></P ><DIV CLASS="VARIABLELIST" ><DL ><DT ><A NAME="GUC-MAX-FILES-PER-PROCESS" ></A ><TT CLASS="VARNAME" >max_files_per_process</TT > (<TT CLASS="TYPE" >integer</TT >)</DT ><DD ><P > Sets the maximum number of simultaneously open files allowed to each server subprocess. The default is one thousand files. If the kernel is enforcing a safe per-process limit, you don't need to worry about this setting. But on some platforms (notably, most BSD systems), the kernel will allow individual processes to open many more files than the system can actually support if many processes all try to open that many files. If you find yourself seeing <SPAN CLASS="QUOTE" >"Too many open files"</SPAN > failures, try reducing this setting. This parameter can only be set at server start. </P ></DD ><DT ><A NAME="GUC-SHARED-PRELOAD-LIBRARIES" ></A ><TT CLASS="VARNAME" >shared_preload_libraries</TT > (<TT CLASS="TYPE" >string</TT >)</DT ><DD ><P > This variable specifies one or more shared libraries to be preloaded at server start. For example, <TT CLASS="LITERAL" >'$libdir/mylib'</TT > would cause <TT CLASS="LITERAL" >mylib.so</TT > (or on some platforms, <TT CLASS="LITERAL" >mylib.sl</TT >) to be preloaded from the installation's standard library directory. All library names are converted to lower case unless double-quoted. If more than one library is to be loaded, separate their names with commas. This parameter can only be set at server start. </P ><P > <SPAN CLASS="PRODUCTNAME" >PostgreSQL</SPAN > procedural language libraries can be preloaded in this way, typically by using the syntax <TT CLASS="LITERAL" >'$libdir/plXXX'</TT > where <TT CLASS="LITERAL" >XXX</TT > is <TT CLASS="LITERAL" >pgsql</TT >, <TT CLASS="LITERAL" >perl</TT >, <TT CLASS="LITERAL" >tcl</TT >, or <TT CLASS="LITERAL" >python</TT >. </P ><P > By preloading a shared library, the library startup time is avoided when the library is first used. However, the time to start each new server process might increase slightly, even if that process never uses the library. So this parameter is recommended only for libraries that will be used in most sessions. </P ><DIV CLASS="NOTE" ><BLOCKQUOTE CLASS="NOTE" ><P ><B >Note: </B > On Windows hosts, preloading a library at server start will not reduce the time required to start each new server process; each server process will re-load all preload libraries. However, <TT CLASS="VARNAME" >shared_preload_libraries </TT > is still useful on Windows hosts because some shared libraries may need to perform certain operations that only take place at postmaster start (for example, a shared library may need to reserve lightweight locks or shared memory and you can't do that after the postmaster has started). </P ></BLOCKQUOTE ></DIV ><P > If a specified library is not found, the server will fail to start. </P ><P > Every PostgreSQL-supported library has a <SPAN CLASS="QUOTE" >"magic block"</SPAN > that is checked to guarantee compatibility. For this reason, non-PostgreSQL libraries cannot be loaded in this way. </P ></DD ></DL ></DIV ></DIV ><DIV CLASS="SECT2" ><H2 CLASS="SECT2" ><A NAME="RUNTIME-CONFIG-RESOURCE-VACUUM-COST" >18.4.4. Cost-based Vacuum Delay</A ></H2 ><P > During the execution of <A HREF="sql-vacuum.html" >VACUUM</A > and <A HREF="sql-analyze.html" >ANALYZE</A > commands, the system maintains an internal counter that keeps track of the estimated cost of the various I/O operations that are performed. When the accumulated cost reaches a limit (specified by <TT CLASS="VARNAME" >vacuum_cost_limit</TT >), the process performing the operation will sleep for a short period of time, as specified by <TT CLASS="VARNAME" >vacuum_cost_delay</TT >. Then it will reset the counter and continue execution. </P ><P > The intent of this feature is to allow administrators to reduce the I/O impact of these commands on concurrent database activity. There are many situations where it is not important that maintenance commands like <TT CLASS="COMMAND" >VACUUM</TT > and <TT CLASS="COMMAND" >ANALYZE</TT > finish quickly; however, it is usually very important that these commands do not significantly interfere with the ability of the system to perform other database operations. Cost-based vacuum delay provides a way for administrators to achieve this. </P ><P > This feature is disabled by default for manually issued <TT CLASS="COMMAND" >VACUUM</TT > commands. To enable it, set the <TT CLASS="VARNAME" >vacuum_cost_delay</TT > variable to a nonzero value. </P ><P ></P ><DIV CLASS="VARIABLELIST" ><DL ><DT ><A NAME="GUC-VACUUM-COST-DELAY" ></A ><TT CLASS="VARNAME" >vacuum_cost_delay</TT > (<TT CLASS="TYPE" >integer</TT >)</DT ><DD ><P > The length of time, in milliseconds, that the process will sleep when the cost limit has been exceeded. The default value is zero, which disables the cost-based vacuum delay feature. Positive values enable cost-based vacuuming. Note that on many systems, the effective resolution of sleep delays is 10 milliseconds; setting <TT CLASS="VARNAME" >vacuum_cost_delay</TT > to a value that is not a multiple of 10 might have the same results as setting it to the next higher multiple of 10. </P ><P > When using cost-based vacuuming, appropriate values for <TT CLASS="VARNAME" >vacuum_cost_delay</TT > are usually quite small, perhaps 10 or 20 milliseconds. Adjusting vacuum's resource consumption is best done by changing the other vacuum cost parameters. </P ></DD ><DT ><A NAME="GUC-VACUUM-COST-PAGE-HIT" ></A ><TT CLASS="VARNAME" >vacuum_cost_page_hit</TT > (<TT CLASS="TYPE" >integer</TT >)</DT ><DD ><P > The estimated cost for vacuuming a buffer found in the shared buffer cache. It represents the cost to lock the buffer pool, lookup the shared hash table and scan the content of the page. The default value is one. </P ></DD ><DT ><A NAME="GUC-VACUUM-COST-PAGE-MISS" ></A ><TT CLASS="VARNAME" >vacuum_cost_page_miss</TT > (<TT CLASS="TYPE" >integer</TT >)</DT ><DD ><P > The estimated cost for vacuuming a buffer that has to be read from disk. This represents the effort to lock the buffer pool, lookup the shared hash table, read the desired block in from the disk and scan its content. The default value is 10. </P ></DD ><DT ><A NAME="GUC-VACUUM-COST-PAGE-DIRTY" ></A ><TT CLASS="VARNAME" >vacuum_cost_page_dirty</TT > (<TT CLASS="TYPE" >integer</TT >)</DT ><DD ><P > The estimated cost charged when vacuum modifies a block that was previously clean. It represents the extra I/O required to flush the dirty block out to disk again. The default value is 20. </P ></DD ><DT ><A NAME="GUC-VACUUM-COST-LIMIT" ></A ><TT CLASS="VARNAME" >vacuum_cost_limit</TT > (<TT CLASS="TYPE" >integer</TT >)</DT ><DD ><P > The accumulated cost that will cause the vacuuming process to sleep. The default value is 200. </P ></DD ></DL ></DIV ><DIV CLASS="NOTE" ><BLOCKQUOTE CLASS="NOTE" ><P ><B >Note: </B > There are certain operations that hold critical locks and should therefore complete as quickly as possible. Cost-based vacuum delays do not occur during such operations. Therefore it is possible that the cost accumulates far higher than the specified limit. To avoid uselessly long delays in such cases, the actual delay is calculated as <TT CLASS="VARNAME" >vacuum_cost_delay</TT > * <TT CLASS="VARNAME" >accumulated_balance</TT > / <TT CLASS="VARNAME" >vacuum_cost_limit</TT > with a maximum of <TT CLASS="VARNAME" >vacuum_cost_delay</TT > * 4. </P ></BLOCKQUOTE ></DIV ></DIV ><DIV CLASS="SECT2" ><H2 CLASS="SECT2" ><A NAME="RUNTIME-CONFIG-RESOURCE-BACKGROUND-WRITER" >18.4.5. Background Writer</A ></H2 ><P > There is a separate server process called the <I CLASS="FIRSTTERM" >background writer</I >, whose function is to issue writes of <SPAN CLASS="QUOTE" >"dirty"</SPAN > (new or modified) shared buffers. It writes shared buffers so server processes handling user queries seldom or never need to wait for a write to occur. However, the background writer does cause a net overall increase in I/O load, because while a repeatedly-dirtied page might otherwise be written only once per checkpoint interval, the background writer might write it several times as it is dirtied in the same interval. The parameters discussed in this subsection can be used to tune the behavior for local needs. </P ><P ></P ><DIV CLASS="VARIABLELIST" ><DL ><DT ><A NAME="GUC-BGWRITER-DELAY" ></A ><TT CLASS="VARNAME" >bgwriter_delay</TT > (<TT CLASS="TYPE" >integer</TT >)</DT ><DD ><P > Specifies the delay between activity rounds for the background writer. In each round the writer issues writes for some number of dirty buffers (controllable by the following parameters). It then sleeps for <TT CLASS="VARNAME" >bgwriter_delay</TT > milliseconds, and repeats. When there are no dirty buffers in the buffer pool, though, it goes into a longer sleep regardless of <TT CLASS="VARNAME" >bgwriter_delay</TT >. The default value is 200 milliseconds (<TT CLASS="LITERAL" >200ms</TT >). Note that on many systems, the effective resolution of sleep delays is 10 milliseconds; setting <TT CLASS="VARNAME" >bgwriter_delay</TT > to a value that is not a multiple of 10 might have the same results as setting it to the next higher multiple of 10. This parameter can only be set in the <TT CLASS="FILENAME" >postgresql.conf</TT > file or on the server command line. </P ></DD ><DT ><A NAME="GUC-BGWRITER-LRU-MAXPAGES" ></A ><TT CLASS="VARNAME" >bgwriter_lru_maxpages</TT > (<TT CLASS="TYPE" >integer</TT >)</DT ><DD ><P > In each round, no more than this many buffers will be written by the background writer. Setting this to zero disables background writing. (Note that checkpoints, which are managed by a separate, dedicated auxiliary process, are unaffected.) The default value is 100 buffers. This parameter can only be set in the <TT CLASS="FILENAME" >postgresql.conf</TT > file or on the server command line. </P ></DD ><DT ><A NAME="GUC-BGWRITER-LRU-MULTIPLIER" ></A ><TT CLASS="VARNAME" >bgwriter_lru_multiplier</TT > (<TT CLASS="TYPE" >floating point</TT >)</DT ><DD ><P > The number of dirty buffers written in each round is based on the number of new buffers that have been needed by server processes during recent rounds. The average recent need is multiplied by <TT CLASS="VARNAME" >bgwriter_lru_multiplier</TT > to arrive at an estimate of the number of buffers that will be needed during the next round. Dirty buffers are written until there are that many clean, reusable buffers available. (However, no more than <TT CLASS="VARNAME" >bgwriter_lru_maxpages</TT > buffers will be written per round.) Thus, a setting of 1.0 represents a <SPAN CLASS="QUOTE" >"just in time"</SPAN > policy of writing exactly the number of buffers predicted to be needed. Larger values provide some cushion against spikes in demand, while smaller values intentionally leave writes to be done by server processes. The default is 2.0. This parameter can only be set in the <TT CLASS="FILENAME" >postgresql.conf</TT > file or on the server command line. </P ></DD ></DL ></DIV ><P > Smaller values of <TT CLASS="VARNAME" >bgwriter_lru_maxpages</TT > and <TT CLASS="VARNAME" >bgwriter_lru_multiplier</TT > reduce the extra I/O load caused by the background writer, but make it more likely that server processes will have to issue writes for themselves, delaying interactive queries. </P ></DIV ><DIV CLASS="SECT2" ><H2 CLASS="SECT2" ><A NAME="RUNTIME-CONFIG-RESOURCE-ASYNC-BEHAVIOR" >18.4.6. Asynchronous Behavior</A ></H2 ><P ></P ><DIV CLASS="VARIABLELIST" ><DL ><DT ><A NAME="GUC-EFFECTIVE-IO-CONCURRENCY" ></A ><TT CLASS="VARNAME" >effective_io_concurrency</TT > (<TT CLASS="TYPE" >integer</TT >)</DT ><DD ><P > Sets the number of concurrent disk I/O operations that <SPAN CLASS="PRODUCTNAME" >PostgreSQL</SPAN > expects can be executed simultaneously. Raising this value will increase the number of I/O operations that any individual <SPAN CLASS="PRODUCTNAME" >PostgreSQL</SPAN > session attempts to initiate in parallel. The allowed range is 1 to 1000, or zero to disable issuance of asynchronous I/O requests. Currently, this setting only affects bitmap heap scans. </P ><P > A good starting point for this setting is the number of separate drives comprising a RAID 0 stripe or RAID 1 mirror being used for the database. (For RAID 5 the parity drive should not be counted.) However, if the database is often busy with multiple queries issued in concurrent sessions, lower values may be sufficient to keep the disk array busy. A value higher than needed to keep the disks busy will only result in extra CPU overhead. </P ><P > For more exotic systems, such as memory-based storage or a RAID array that is limited by bus bandwidth, the correct value might be the number of I/O paths available. Some experimentation may be needed to find the best value. </P ><P > Asynchronous I/O depends on an effective <CODE CLASS="FUNCTION" >posix_fadvise</CODE > function, which some operating systems lack. If the function is not present then setting this parameter to anything but zero will result in an error. On some operating systems (e.g., Solaris), the function is present but does not actually do anything. </P ></DD ></DL ></DIV ></DIV ></DIV ><DIV CLASS="NAVFOOTER" ><HR ALIGN="LEFT" WIDTH="100%"><TABLE SUMMARY="Footer navigation table" WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" ><A HREF="runtime-config-connection.html" ACCESSKEY="P" >Prev</A ></TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="index.html" ACCESSKEY="H" >Home</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" ><A HREF="runtime-config-wal.html" ACCESSKEY="N" >Next</A ></TD ></TR ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" >Connections and Authentication</TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="runtime-config.html" ACCESSKEY="U" >Up</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" >Write Ahead Log</TD ></TR ></TABLE ></DIV ></BODY ></HTML >
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