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+<!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 Vsnapshot" /><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 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 15.4 Documentation">Home</a></td><td width="10%" align="right"> <a accesskey="n" href="sql-reindex.html" title="REINDEX">Next</a></td></tr></table><hr /></div><div class="refentry" id="SQL-REFRESHMATERIALIZEDVIEW"><div class="titlepage"></div><a id="id-1.9.3.162.1" 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-1.9.3.162.5"><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-1.9.3.162.6"><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-1.9.3.162.7"><h2>Notes</h2><p>
+   If there is an <code class="literal">ORDER BY</code> clause in the materialized
+   view's defining query, the original contents of the materialized view
+   will be ordered that way; but <code class="command">REFRESH MATERIALIZED
+   VIEW</code> does not guarantee to preserve that ordering.
+  </p></div><div class="refsect1" id="id-1.9.3.162.8"><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-1.9.3.162.9"><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-1.9.3.162.10"><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 class="navfooter"><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 15.4 Documentation">Home</a></td><td width="40%" align="right" valign="top"> REINDEX</td></tr></table></div></body></html>
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