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<title>ALTER INDEX</title>
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<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="refentry" lang="en">
<a name="sql-alterindex"></a><div class="titlepage"></div>
<div class="refnamediv">
<h2>Name</h2>
<p>ALTER INDEX — change the definition of an index</p>
</div>
<a name="id742936"></a><div class="refsynopsisdiv">
<h2>Synopsis</h2>
<pre class="synopsis">ALTER INDEX <em class="replaceable"><code>name</code></em> RENAME TO <em class="replaceable"><code>new_name</code></em>
ALTER INDEX <em class="replaceable"><code>name</code></em> SET TABLESPACE <em class="replaceable"><code>tablespace_name</code></em></pre>
</div>
<div class="refsect1" lang="en">
<a name="id742980"></a><h2>Description</h2>
<p> <code class="command">ALTER INDEX</code> changes the definition of an existing index.
There are several subforms:
</p>
<div class="variablelist"><dl>
<dt><span class="term"><code class="literal">RENAME</code></span></dt>
<dd><p> The <code class="literal">RENAME</code> form changes the name of the index.
There is no effect on the stored data.
</p></dd>
<dt><span class="term"><code class="literal">SET TABLESPACE</code></span></dt>
<dd><p> This form changes the index's tablespace to the specified tablespace and
moves the data file(s) associated with the index to the new tablespace.
See also
<a href="sql-createtablespace.html">CREATE TABLESPACE</a>.
</p></dd>
</dl></div>
<p>
</p>
</div>
<div class="refsect1" lang="en">
<a name="id743043"></a><h2>Parameters</h2>
<div class="variablelist"><dl>
<dt><span class="term"><em class="replaceable"><code>name</code></em></span></dt>
<dd><p> The name (possibly schema-qualified) of an existing index to
alter.
</p></dd>
<dt><span class="term"><em class="replaceable"><code>new_name</code></em></span></dt>
<dd><p> New name for the index.
</p></dd>
<dt><span class="term"><em class="replaceable"><code>tablespace_name</code></em></span></dt>
<dd><p> The tablespace to which the index will be moved.
</p></dd>
</dl></div>
</div>
<div class="refsect1" lang="en">
<a name="id743086"></a><h2>Notes</h2>
<p> These operations are also possible using
<a href="sql-altertable.html">ALTER TABLE</a>.
<code class="command">ALTER INDEX</code> is in fact just an alias for the forms
of <code class="command">ALTER TABLE</code> that apply to indexes.
</p>
<p> There was formerly an <code class="command">ALTER INDEX OWNER</code> variant, but
this is now ignored (with a warning). An index cannot have an owner
different from its table's owner. Changing the table's owner
automatically changes the index as well.
</p>
<p> Changing any part of a system catalog index is not permitted.
</p>
</div>
<div class="refsect1" lang="en">
<a name="id743134"></a><h2>Examples</h2>
<p> To rename an existing index:
</p>
<pre class="programlisting">ALTER INDEX distributors RENAME TO suppliers;</pre>
<p>
</p>
<p>
To move an index to a different tablespace:
</p>
<pre class="programlisting">ALTER INDEX distributors SET TABLESPACE fasttablespace;</pre>
<p>
</p>
</div>
<div class="refsect1" lang="en">
<a name="id743159"></a><h2>Compatibility</h2>
<p> <code class="command">ALTER INDEX</code> is a <span class="productname">PostgreSQL</span>
extension.
</p>
</div>
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