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<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /><title>54.24. pg_settings</title><link rel="stylesheet" type="text/css" href="stylesheet.css" /><link rev="made" href="pgsql-docs@lists.postgresql.org" /><meta name="generator" content="DocBook XSL Stylesheets Vsnapshot" /><link rel="prev" href="view-pg-sequences.html" title="54.23. pg_sequences" /><link rel="next" href="view-pg-shadow.html" title="54.25. pg_shadow" /></head><body id="docContent" class="container-fluid col-10"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="5" align="center">54.24. <code class="structname">pg_settings</code></th></tr><tr><td width="10%" align="left"><a accesskey="p" href="view-pg-sequences.html" title="54.23. pg_sequences">Prev</a> </td><td width="10%" align="left"><a accesskey="u" href="views.html" title="Chapter 54. System Views">Up</a></td><th width="60%" align="center">Chapter 54. System Views</th><td width="10%" align="right"><a accesskey="h" href="index.html" title="PostgreSQL 15.7 Documentation">Home</a></td><td width="10%" align="right"> <a accesskey="n" href="view-pg-shadow.html" title="54.25. pg_shadow">Next</a></td></tr></table><hr /></div><div class="sect1" id="VIEW-PG-SETTINGS"><div class="titlepage"><div><div><h2 class="title" style="clear: both">54.24. <code class="structname">pg_settings</code></h2></div></div></div><a id="id-1.10.5.28.2" class="indexterm"></a><p>
The view <code class="structname">pg_settings</code> provides access to
run-time parameters of the server. It is essentially an alternative
interface to the <a class="link" href="sql-show.html" title="SHOW"><code class="command">SHOW</code></a>
and <a class="link" href="sql-set.html" title="SET"><code class="command">SET</code></a> commands.
It also provides access to some facts about each parameter that are
not directly available from <a class="link" href="sql-show.html" title="SHOW"><code class="command">SHOW</code></a>, such as minimum and
maximum values.
</p><div class="table" id="id-1.10.5.28.4"><p class="title"><strong>Table 54.24. <code class="structname">pg_settings</code> Columns</strong></p><div class="table-contents"><table class="table" summary="pg_settings Columns" border="1"><colgroup><col /></colgroup><thead><tr><th class="catalog_table_entry"><p class="column_definition">
Column Type
</p>
<p>
Description
</p></th></tr></thead><tbody><tr><td class="catalog_table_entry"><p class="column_definition">
<code class="structfield">name</code> <code class="type">text</code>
</p>
<p>
Run-time configuration parameter name
</p></td></tr><tr><td class="catalog_table_entry"><p class="column_definition">
<code class="structfield">setting</code> <code class="type">text</code>
</p>
<p>
Current value of the parameter
</p></td></tr><tr><td class="catalog_table_entry"><p class="column_definition">
<code class="structfield">unit</code> <code class="type">text</code>
</p>
<p>
Implicit unit of the parameter
</p></td></tr><tr><td class="catalog_table_entry"><p class="column_definition">
<code class="structfield">category</code> <code class="type">text</code>
</p>
<p>
Logical group of the parameter
</p></td></tr><tr><td class="catalog_table_entry"><p class="column_definition">
<code class="structfield">short_desc</code> <code class="type">text</code>
</p>
<p>
A brief description of the parameter
</p></td></tr><tr><td class="catalog_table_entry"><p class="column_definition">
<code class="structfield">extra_desc</code> <code class="type">text</code>
</p>
<p>
Additional, more detailed, description of the parameter
</p></td></tr><tr><td class="catalog_table_entry"><p class="column_definition">
<code class="structfield">context</code> <code class="type">text</code>
</p>
<p>
Context required to set the parameter's value (see below)
</p></td></tr><tr><td class="catalog_table_entry"><p class="column_definition">
<code class="structfield">vartype</code> <code class="type">text</code>
</p>
<p>
Parameter type (<code class="literal">bool</code>, <code class="literal">enum</code>,
<code class="literal">integer</code>, <code class="literal">real</code>, or <code class="literal">string</code>)
</p></td></tr><tr><td class="catalog_table_entry"><p class="column_definition">
<code class="structfield">source</code> <code class="type">text</code>
</p>
<p>
Source of the current parameter value
</p></td></tr><tr><td class="catalog_table_entry"><p class="column_definition">
<code class="structfield">min_val</code> <code class="type">text</code>
</p>
<p>
Minimum allowed value of the parameter (null for non-numeric
values)
</p></td></tr><tr><td class="catalog_table_entry"><p class="column_definition">
<code class="structfield">max_val</code> <code class="type">text</code>
</p>
<p>
Maximum allowed value of the parameter (null for non-numeric
values)
</p></td></tr><tr><td class="catalog_table_entry"><p class="column_definition">
<code class="structfield">enumvals</code> <code class="type">text[]</code>
</p>
<p>
Allowed values of an enum parameter (null for non-enum
values)
</p></td></tr><tr><td class="catalog_table_entry"><p class="column_definition">
<code class="structfield">boot_val</code> <code class="type">text</code>
</p>
<p>
Parameter value assumed at server startup if the parameter is
not otherwise set
</p></td></tr><tr><td class="catalog_table_entry"><p class="column_definition">
<code class="structfield">reset_val</code> <code class="type">text</code>
</p>
<p>
Value that <a class="link" href="sql-reset.html" title="RESET"><code class="command">RESET</code></a> would reset the parameter to
in the current session
</p></td></tr><tr><td class="catalog_table_entry"><p class="column_definition">
<code class="structfield">sourcefile</code> <code class="type">text</code>
</p>
<p>
Configuration file the current value was set in (null for
values set from sources other than configuration files, or when
examined by a user who neither is a superuser nor has privileges of
<code class="literal">pg_read_all_settings</code>); helpful when using
<code class="literal">include</code> directives in configuration files
</p></td></tr><tr><td class="catalog_table_entry"><p class="column_definition">
<code class="structfield">sourceline</code> <code class="type">int4</code>
</p>
<p>
Line number within the configuration file the current value was
set at (null for values set from sources other than configuration files,
or when examined by a user who neither is a superuser nor has privileges of
<code class="literal">pg_read_all_settings</code>).
</p></td></tr><tr><td class="catalog_table_entry"><p class="column_definition">
<code class="structfield">pending_restart</code> <code class="type">bool</code>
</p>
<p>
<code class="literal">true</code> if the value has been changed in the
configuration file but needs a restart; or <code class="literal">false</code>
otherwise.
</p></td></tr></tbody></table></div></div><br class="table-break" /><p>
There are several possible values of <code class="structfield">context</code>.
In order of decreasing difficulty of changing the setting, they are:
</p><div class="variablelist"><dl class="variablelist"><dt><span class="term"><code class="literal">internal</code></span></dt><dd><p>
These settings cannot be changed directly; they reflect internally
determined values. Some of them may be adjustable by rebuilding the
server with different configuration options, or by changing options
supplied to <span class="application">initdb</span>.
</p></dd><dt><span class="term"><code class="literal">postmaster</code></span></dt><dd><p>
These settings can only be applied when the server starts, so any change
requires restarting the server. Values for these settings are typically
stored in the <code class="filename">postgresql.conf</code> file, or passed on
the command line when starting the server. Of course, settings with any
of the lower <code class="structfield">context</code> types can also be
set at server start time.
</p></dd><dt><span class="term"><code class="literal">sighup</code></span></dt><dd><p>
Changes to these settings can be made in
<code class="filename">postgresql.conf</code> without restarting the server.
Send a <span class="systemitem">SIGHUP</span> signal to the postmaster to
cause it to re-read <code class="filename">postgresql.conf</code> and apply
the changes. The postmaster will also forward the
<span class="systemitem">SIGHUP</span> signal to its child processes so that
they all pick up the new value.
</p></dd><dt><span class="term"><code class="literal">superuser-backend</code></span></dt><dd><p>
Changes to these settings can be made in
<code class="filename">postgresql.conf</code> without restarting the server.
They can also be set for a particular session in the connection request
packet (for example, via <span class="application">libpq</span>'s <code class="literal">PGOPTIONS</code>
environment variable), but only if the connecting user is a superuser
or has been granted the appropriate <code class="literal">SET</code> privilege.
However, these settings never change in a session after it is started.
If you change them in <code class="filename">postgresql.conf</code>, send a
<span class="systemitem">SIGHUP</span> signal to the postmaster to cause it to
re-read <code class="filename">postgresql.conf</code>. The new values will only
affect subsequently-launched sessions.
</p></dd><dt><span class="term"><code class="literal">backend</code></span></dt><dd><p>
Changes to these settings can be made in
<code class="filename">postgresql.conf</code> without restarting the server.
They can also be set for a particular session in the connection request
packet (for example, via <span class="application">libpq</span>'s <code class="literal">PGOPTIONS</code>
environment variable); any user can make such a change for their session.
However, these settings never change in a session after it is started.
If you change them in <code class="filename">postgresql.conf</code>, send a
<span class="systemitem">SIGHUP</span> signal to the postmaster to cause it to
re-read <code class="filename">postgresql.conf</code>. The new values will only
affect subsequently-launched sessions.
</p></dd><dt><span class="term"><code class="literal">superuser</code></span></dt><dd><p>
These settings can be set from <code class="filename">postgresql.conf</code>,
or within a session via the <code class="command">SET</code> command; but only superusers
and users with the appropriate <code class="literal">SET</code> privilege
can change them via <code class="command">SET</code>. Changes in
<code class="filename">postgresql.conf</code> will affect existing sessions
only if no session-local value has been established with <code class="command">SET</code>.
</p></dd><dt><span class="term"><code class="literal">user</code></span></dt><dd><p>
These settings can be set from <code class="filename">postgresql.conf</code>,
or within a session via the <code class="command">SET</code> command. Any user is
allowed to change their session-local value. Changes in
<code class="filename">postgresql.conf</code> will affect existing sessions
only if no session-local value has been established with <code class="command">SET</code>.
</p></dd></dl></div><p>
See <a class="xref" href="config-setting.html" title="20.1. Setting Parameters">Section 20.1</a> for more information about the various
ways to change these parameters.
</p><p>
This view cannot be inserted into or deleted from, but it can be updated. An
<code class="command">UPDATE</code> applied to a row of <code class="structname">pg_settings</code>
is equivalent to executing the <code class="command">SET</code> command on that named
parameter. The change only affects the value used by the current
session. If an <code class="command">UPDATE</code> is issued within a transaction
that is later aborted, the effects of the <code class="command">UPDATE</code> command
disappear when the transaction is rolled back. Once the surrounding
transaction is committed, the effects will persist until the end of the
session, unless overridden by another <code class="command">UPDATE</code> or
<code class="command">SET</code>.
</p><p>
This view does not
display <a class="link" href="runtime-config-custom.html" title="20.16. Customized Options">customized options</a>
unless the extension module that defines them has been loaded by the
backend process executing the query (e.g., via a mention in
<a class="xref" href="runtime-config-client.html#GUC-SHARED-PRELOAD-LIBRARIES">shared_preload_libraries</a>,
a call to a C function in the extension, or the
<a class="link" href="sql-load.html" title="LOAD"><code class="command">LOAD</code></a> command).
For example, since <a class="link" href="archive-modules.html" title="Chapter 51. Archive Modules">archive modules</a>
are normally loaded only by the archiver process not regular sessions,
this view will not display any customized options defined by such modules
unless special action is taken to load them into the backend process
executing the query.
</p></div><div class="navfooter"><hr /><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="view-pg-sequences.html" title="54.23. pg_sequences">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="views.html" title="Chapter 54. System Views">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="view-pg-shadow.html" title="54.25. pg_shadow">Next</a></td></tr><tr><td width="40%" align="left" valign="top">54.23. <code class="structname">pg_sequences</code> </td><td width="20%" align="center"><a accesskey="h" href="index.html" title="PostgreSQL 15.7 Documentation">Home</a></td><td width="40%" align="right" valign="top"> 54.25. <code class="structname">pg_shadow</code></td></tr></table></div></body></html>
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