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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-refreshmaterializedview.html | |
| parent | Initial commit. (diff) | |
| download | postgresql-13-upstream/13.4.tar.xz postgresql-13-upstream/13.4.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-refreshmaterializedview.html')
| -rw-r--r-- | doc/src/sgml/html/sql-refreshmaterializedview.html | 61 |
1 files changed, 61 insertions, 0 deletions
diff --git a/doc/src/sgml/html/sql-refreshmaterializedview.html b/doc/src/sgml/html/sql-refreshmaterializedview.html new file mode 100644 index 0000000..4b70227 --- /dev/null +++ b/doc/src/sgml/html/sql-refreshmaterializedview.html @@ -0,0 +1,61 @@ +<?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>REFRESH MATERIALIZED VIEW</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-reassign-owned.html" title="REASSIGN OWNED" /><link rel="next" href="sql-reindex.html" title="REINDEX" /></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">REFRESH MATERIALIZED VIEW</th></tr><tr><td width="10%" align="left"><a accesskey="p" href="sql-reassign-owned.html" title="REASSIGN OWNED">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-reindex.html" title="REINDEX">Next</a></td></tr></table><hr></hr></div><div class="refentry" id="SQL-REFRESHMATERIALIZEDVIEW"><div class="titlepage"></div><a id="id-1.9.3.161.1" class="indexterm"></a><div class="refnamediv"><h2><span class="refentrytitle">REFRESH MATERIALIZED VIEW</span></h2><p>REFRESH MATERIALIZED VIEW — replace the contents of a materialized view</p></div><div class="refsynopsisdiv"><h2>Synopsis</h2><pre class="synopsis"> +REFRESH MATERIALIZED VIEW [ CONCURRENTLY ] <em class="replaceable"><code>name</code></em> + [ WITH [ NO ] DATA ] +</pre></div><div class="refsect1" id="id-1.9.3.161.5"><h2>Description</h2><p> + <code class="command">REFRESH MATERIALIZED VIEW</code> completely replaces the + contents of a materialized view. To execute this command you must be the + owner of the materialized view. The old contents are discarded. If + <code class="literal">WITH DATA</code> is specified (or defaults) the backing query + is executed to provide the new data, and the materialized view is left in a + scannable state. If <code class="literal">WITH NO DATA</code> is specified no new + data is generated and the materialized view is left in an unscannable + state. + </p><p> + <code class="literal">CONCURRENTLY</code> and <code class="literal">WITH NO DATA</code> may not + be specified together. + </p></div><div class="refsect1" id="id-1.9.3.161.6"><h2>Parameters</h2><div class="variablelist"><dl class="variablelist"><dt><span class="term"><code class="literal">CONCURRENTLY</code></span></dt><dd><p> + Refresh the materialized view without locking out concurrent selects on + the materialized view. Without this option a refresh which affects a + lot of rows will tend to use fewer resources and complete more quickly, + but could block other connections which are trying to read from the + materialized view. This option may be faster in cases where a small + number of rows are affected. + </p><p> + This option is only allowed if there is at least one + <code class="literal">UNIQUE</code> index on the materialized view which uses only + column names and includes all rows; that is, it must not be an + expression index or include a <code class="literal">WHERE</code> clause. + </p><p> + This option may not be used when the materialized view is not already + populated. + </p><p> + Even with this option only one <code class="literal">REFRESH</code> at a time may + run against any one materialized view. + </p></dd><dt><span class="term"><em class="replaceable"><code>name</code></em></span></dt><dd><p> + The name (optionally schema-qualified) of the materialized view to + refresh. + </p></dd></dl></div></div><div class="refsect1" id="id-1.9.3.161.7"><h2>Notes</h2><p> + While the default index for future + <a class="xref" href="sql-cluster.html" title="CLUSTER"><span class="refentrytitle">CLUSTER</span></a> + operations is retained, <code class="command">REFRESH MATERIALIZED VIEW</code> does not + order the generated rows based on this property. If you want the data + to be ordered upon generation, you must use an <code class="literal">ORDER BY</code> + clause in the backing query. + </p></div><div class="refsect1" id="id-1.9.3.161.8"><h2>Examples</h2><p> + This command will replace the contents of the materialized view called + <code class="literal">order_summary</code> using the query from the materialized + view's definition, and leave it in a scannable state: +</p><pre class="programlisting"> +REFRESH MATERIALIZED VIEW order_summary; +</pre><p> + </p><p> + This command will free storage associated with the materialized view + <code class="literal">annual_statistics_basis</code> and leave it in an unscannable + state: +</p><pre class="programlisting"> +REFRESH MATERIALIZED VIEW annual_statistics_basis WITH NO DATA; +</pre></div><div class="refsect1" id="id-1.9.3.161.9"><h2>Compatibility</h2><p> + <code class="command">REFRESH MATERIALIZED VIEW</code> is a + <span class="productname">PostgreSQL</span> extension. + </p></div><div class="refsect1" id="id-1.9.3.161.10"><h2>See Also</h2><span class="simplelist"><a class="xref" href="sql-creatematerializedview.html" title="CREATE MATERIALIZED VIEW"><span class="refentrytitle">CREATE MATERIALIZED VIEW</span></a>, <a class="xref" href="sql-altermaterializedview.html" title="ALTER MATERIALIZED VIEW"><span class="refentrytitle">ALTER MATERIALIZED VIEW</span></a>, <a class="xref" href="sql-dropmaterializedview.html" title="DROP MATERIALIZED VIEW"><span class="refentrytitle">DROP MATERIALIZED VIEW</span></a></span></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-reassign-owned.html" title="REASSIGN OWNED">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-reindex.html" title="REINDEX">Next</a></td></tr><tr><td width="40%" align="left" valign="top">REASSIGN OWNED </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"> REINDEX</td></tr></table></div></body></html>
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