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| author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-05-04 12:19:15 +0000 |
|---|---|---|
| committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-05-04 12:19:15 +0000 |
| commit | 6eb9c5a5657d1fe77b55cc261450f3538d35a94d (patch) | |
| tree | 657d8194422a5daccecfd42d654b8a245ef7b4c8 /doc/src/sgml/html/sql-discard.html | |
| parent | Initial commit. (diff) | |
| download | postgresql-13-upstream.tar.xz postgresql-13-upstream.zip | |
Adding upstream version 13.4.upstream/13.4upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'doc/src/sgml/html/sql-discard.html')
| -rw-r--r-- | doc/src/sgml/html/sql-discard.html | 41 |
1 files changed, 41 insertions, 0 deletions
diff --git a/doc/src/sgml/html/sql-discard.html b/doc/src/sgml/html/sql-discard.html new file mode 100644 index 0000000..764cb46 --- /dev/null +++ b/doc/src/sgml/html/sql-discard.html @@ -0,0 +1,41 @@ +<?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>DISCARD</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 V1.79.1" /><link rel="prev" href="sql-delete.html" title="DELETE" /><link rel="next" href="sql-do.html" title="DO" /></head><body id="docContent" class="container-fluid col-10"><div xmlns="http://www.w3.org/TR/xhtml1/transitional" class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="5" align="center">DISCARD</th></tr><tr><td width="10%" align="left"><a accesskey="p" href="sql-delete.html" title="DELETE">Prev</a> </td><td width="10%" align="left"><a accesskey="u" href="sql-commands.html" title="SQL Commands">Up</a></td><th width="60%" align="center">SQL Commands</th><td width="10%" align="right"><a accesskey="h" href="index.html" title="PostgreSQL 13.4 Documentation">Home</a></td><td width="10%" align="right"> <a accesskey="n" href="sql-do.html" title="DO">Next</a></td></tr></table><hr></hr></div><div class="refentry" id="SQL-DISCARD"><div class="titlepage"></div><a id="id-1.9.3.101.1" class="indexterm"></a><div class="refnamediv"><h2><span class="refentrytitle">DISCARD</span></h2><p>DISCARD — discard session state</p></div><div class="refsynopsisdiv"><h2>Synopsis</h2><pre class="synopsis"> +DISCARD { ALL | PLANS | SEQUENCES | TEMPORARY | TEMP } +</pre></div><div class="refsect1" id="id-1.9.3.101.5"><h2>Description</h2><p> + <code class="command">DISCARD</code> releases internal resources associated with a + database session. This command is useful for partially or fully + resetting the session's state. There are several subcommands to + release different types of resources; the <code class="command">DISCARD ALL</code> + variant subsumes all the others, and also resets additional state. + </p></div><div class="refsect1" id="id-1.9.3.101.6"><h2>Parameters</h2><div class="variablelist"><dl class="variablelist"><dt><span class="term"><code class="literal">PLANS</code></span></dt><dd><p> + Releases all cached query plans, forcing re-planning to occur + the next time the associated prepared statement is used. + </p></dd><dt><span class="term"><code class="literal">SEQUENCES</code></span></dt><dd><p> + Discards all cached sequence-related state, + including <code class="function">currval()</code>/<code class="function">lastval()</code> + information and any preallocated sequence values that have not + yet been returned by <code class="function">nextval()</code>. + (See <a class="xref" href="sql-createsequence.html" title="CREATE SEQUENCE"><span class="refentrytitle">CREATE SEQUENCE</span></a> for a description of + preallocated sequence values.) + </p></dd><dt><span class="term"><code class="literal">TEMPORARY</code> or <code class="literal">TEMP</code></span></dt><dd><p> + Drops all temporary tables created in the current session. + </p></dd><dt><span class="term"><code class="literal">ALL</code></span></dt><dd><p> + Releases all temporary resources associated with the current + session and resets the session to its initial state. + Currently, this has the same effect as executing the following sequence + of statements: +</p><pre class="programlisting"> +CLOSE ALL; +SET SESSION AUTHORIZATION DEFAULT; +RESET ALL; +DEALLOCATE ALL; +UNLISTEN *; +SELECT pg_advisory_unlock_all(); +DISCARD PLANS; +DISCARD TEMP; +DISCARD SEQUENCES; +</pre></dd></dl></div></div><div class="refsect1" id="id-1.9.3.101.7"><h2>Notes</h2><p> + <code class="command">DISCARD ALL</code> cannot be executed inside a transaction block. + </p></div><div class="refsect1" id="id-1.9.3.101.8"><h2>Compatibility</h2><p> + <code class="command">DISCARD</code> is a <span class="productname">PostgreSQL</span> extension. + </p></div></div><div xmlns="http://www.w3.org/TR/xhtml1/transitional" class="navfooter"><hr></hr><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="sql-delete.html" title="DELETE">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="sql-commands.html" title="SQL Commands">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="sql-do.html" title="DO">Next</a></td></tr><tr><td width="40%" align="left" valign="top">DELETE </td><td width="20%" align="center"><a accesskey="h" href="index.html" title="PostgreSQL 13.4 Documentation">Home</a></td><td width="40%" align="right" valign="top"> DO</td></tr></table></div></body></html>
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