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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>clusterdb</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="reference-client.html" title="PostgreSQL Client Applications" /><link rel="next" href="app-createdb.html" title="createdb" /></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"><span xmlns="http://www.w3.org/1999/xhtml" class="application">clusterdb</span></th></tr><tr><td width="10%" align="left"><a accesskey="p" href="reference-client.html" title="PostgreSQL Client Applications">Prev</a> </td><td width="10%" align="left"><a accesskey="u" href="reference-client.html" title="PostgreSQL Client Applications">Up</a></td><th width="60%" align="center">PostgreSQL Client Applications</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="app-createdb.html" title="createdb">Next</a></td></tr></table><hr></hr></div><div class="refentry" id="APP-CLUSTERDB"><div class="titlepage"></div><a id="id-1.9.4.3.1" class="indexterm"></a><div class="refnamediv"><h2><span class="refentrytitle"><span class="application">clusterdb</span></span></h2><p>clusterdb — cluster a <span class="productname">PostgreSQL</span> database</p></div><div class="refsynopsisdiv"><h2>Synopsis</h2><div class="cmdsynopsis"><p id="id-1.9.4.3.4.1"><code class="command">clusterdb</code> [<em class="replaceable"><code>connection-option</code></em>...] [ <code class="option">--verbose</code> | <code class="option">-v</code> ]
[
<code class="option">--table</code> | <code class="option">-t</code>
<em class="replaceable"><code>table</code></em>
]
... [<em class="replaceable"><code>dbname</code></em>]</p></div><div class="cmdsynopsis"><p id="id-1.9.4.3.4.2"><code class="command">clusterdb</code> [<em class="replaceable"><code>connection-option</code></em>...] [ <code class="option">--verbose</code> | <code class="option">-v</code> ] <code class="option">--all</code> | <code class="option">-a</code> </p></div></div><div class="refsect1" id="id-1.9.4.3.5"><h2>Description</h2><p>
<span class="application">clusterdb</span> is a utility for reclustering tables
in a <span class="productname">PostgreSQL</span> database. It finds tables
that have previously been clustered, and clusters them again on the same
index that was last used. Tables that have never been clustered are not
affected.
</p><p>
<span class="application">clusterdb</span> is a wrapper around the SQL
command <a class="xref" href="sql-cluster.html" title="CLUSTER"><span class="refentrytitle">CLUSTER</span></a>.
There is no effective difference between clustering databases via
this utility and via other methods for accessing the server.
</p></div><div class="refsect1" id="id-1.9.4.3.6"><h2>Options</h2><p>
<span class="application">clusterdb</span> accepts the following command-line arguments:
</p><div class="variablelist"><dl class="variablelist"><dt><span class="term"><code class="option">-a</code><br /></span><span class="term"><code class="option">--all</code></span></dt><dd><p>
Cluster all databases.
</p></dd><dt><span class="term"><code class="option">[<span class="optional">-d</span>] <em class="replaceable"><code>dbname</code></em></code><br /></span><span class="term"><code class="option">[<span class="optional">--dbname=</span>]<em class="replaceable"><code>dbname</code></em></code></span></dt><dd><p>
Specifies the name of the database to be clustered,
when <code class="option">-a</code>/<code class="option">--all</code> is not used.
If this is not specified, the database name is read
from the environment variable <code class="envar">PGDATABASE</code>. If
that is not set, the user name specified for the connection is
used. The <em class="replaceable"><code>dbname</code></em> can be a <a class="link" href="libpq-connect.html#LIBPQ-CONNSTRING" title="33.1.1. Connection Strings">connection string</a>. If so,
connection string parameters will override any conflicting command
line options.
</p></dd><dt><span class="term"><code class="option">-e</code><br /></span><span class="term"><code class="option">--echo</code></span></dt><dd><p>
Echo the commands that <span class="application">clusterdb</span> generates
and sends to the server.
</p></dd><dt><span class="term"><code class="option">-q</code><br /></span><span class="term"><code class="option">--quiet</code></span></dt><dd><p>
Do not display progress messages.
</p></dd><dt><span class="term"><code class="option">-t <em class="replaceable"><code>table</code></em></code><br /></span><span class="term"><code class="option">--table=<em class="replaceable"><code>table</code></em></code></span></dt><dd><p>
Cluster <em class="replaceable"><code>table</code></em> only.
Multiple tables can be clustered by writing multiple
<code class="option">-t</code> switches.
</p></dd><dt><span class="term"><code class="option">-v</code><br /></span><span class="term"><code class="option">--verbose</code></span></dt><dd><p>
Print detailed information during processing.
</p></dd><dt><span class="term"><code class="option">-V</code><br /></span><span class="term"><code class="option">--version</code></span></dt><dd><p>
Print the <span class="application">clusterdb</span> version and exit.
</p></dd><dt><span class="term"><code class="option">-?</code><br /></span><span class="term"><code class="option">--help</code></span></dt><dd><p>
Show help about <span class="application">clusterdb</span> command line
arguments, and exit.
</p></dd></dl></div><p>
</p><p>
<span class="application">clusterdb</span> also accepts
the following command-line arguments for connection parameters:
</p><div class="variablelist"><dl class="variablelist"><dt><span class="term"><code class="option">-h <em class="replaceable"><code>host</code></em></code><br /></span><span class="term"><code class="option">--host=<em class="replaceable"><code>host</code></em></code></span></dt><dd><p>
Specifies the host name of the machine on which the server is
running. If the value begins with a slash, it is used as the
directory for the Unix domain socket.
</p></dd><dt><span class="term"><code class="option">-p <em class="replaceable"><code>port</code></em></code><br /></span><span class="term"><code class="option">--port=<em class="replaceable"><code>port</code></em></code></span></dt><dd><p>
Specifies the TCP port or local Unix domain socket file
extension on which the server
is listening for connections.
</p></dd><dt><span class="term"><code class="option">-U <em class="replaceable"><code>username</code></em></code><br /></span><span class="term"><code class="option">--username=<em class="replaceable"><code>username</code></em></code></span></dt><dd><p>
User name to connect as.
</p></dd><dt><span class="term"><code class="option">-w</code><br /></span><span class="term"><code class="option">--no-password</code></span></dt><dd><p>
Never issue a password prompt. If the server requires
password authentication and a password is not available by
other means such as a <code class="filename">.pgpass</code> file, the
connection attempt will fail. This option can be useful in
batch jobs and scripts where no user is present to enter a
password.
</p></dd><dt><span class="term"><code class="option">-W</code><br /></span><span class="term"><code class="option">--password</code></span></dt><dd><p>
Force <span class="application">clusterdb</span> to prompt for a
password before connecting to a database.
</p><p>
This option is never essential, since
<span class="application">clusterdb</span> will automatically prompt
for a password if the server demands password authentication.
However, <span class="application">clusterdb</span> will waste a
connection attempt finding out that the server wants a password.
In some cases it is worth typing <code class="option">-W</code> to avoid the extra
connection attempt.
</p></dd><dt><span class="term"><code class="option">--maintenance-db=<em class="replaceable"><code>dbname</code></em></code></span></dt><dd><p>
Specifies the name of the database to connect to to discover which
databases should be clustered,
when <code class="option">-a</code>/<code class="option">--all</code> is used.
If not specified, the <code class="literal">postgres</code> database will be used,
or if that does not exist, <code class="literal">template1</code> will be used.
This can be a <a class="link" href="libpq-connect.html#LIBPQ-CONNSTRING" title="33.1.1. Connection Strings">connection
string</a>. If so, connection string parameters will override any
conflicting command line options. Also, connection string parameters
other than the database name itself will be re-used when connecting
to other databases.
</p></dd></dl></div><p>
</p></div><div class="refsect1" id="id-1.9.4.3.7"><h2>Environment</h2><div class="variablelist"><dl class="variablelist"><dt><span class="term"><code class="envar">PGDATABASE</code><br /></span><span class="term"><code class="envar">PGHOST</code><br /></span><span class="term"><code class="envar">PGPORT</code><br /></span><span class="term"><code class="envar">PGUSER</code></span></dt><dd><p>
Default connection parameters
</p></dd><dt><span class="term"><code class="envar">PG_COLOR</code></span></dt><dd><p>
Specifies whether to use color in diagnostic messages. Possible values
are <code class="literal">always</code>, <code class="literal">auto</code> and
<code class="literal">never</code>.
</p></dd></dl></div><p>
This utility, like most other <span class="productname">PostgreSQL</span> utilities,
also uses the environment variables supported by <span class="application">libpq</span>
(see <a class="xref" href="libpq-envars.html" title="33.14. Environment Variables">Section 33.14</a>).
</p></div><div class="refsect1" id="id-1.9.4.3.8"><h2>Diagnostics</h2><p>
In case of difficulty, see <a class="xref" href="sql-cluster.html" title="CLUSTER"><span class="refentrytitle">CLUSTER</span></a>
and <a class="xref" href="app-psql.html" title="psql"><span class="refentrytitle"><span class="application">psql</span></span></a> for
discussions of potential problems and error messages.
The database server must be running at the
targeted host. Also, any default connection settings and environment
variables used by the <span class="application">libpq</span> front-end
library will apply.
</p></div><div class="refsect1" id="id-1.9.4.3.9"><h2>Examples</h2><p>
To cluster the database <code class="literal">test</code>:
</p><pre class="screen">
<code class="prompt">$ </code><strong class="userinput"><code>clusterdb test</code></strong>
</pre><p>
</p><p>
To cluster a single table
<code class="literal">foo</code> in a database named
<code class="literal">xyzzy</code>:
</p><pre class="screen">
<code class="prompt">$ </code><strong class="userinput"><code>clusterdb --table=foo xyzzy</code></strong>
</pre></div><div class="refsect1" id="id-1.9.4.3.10"><h2>See Also</h2><span class="simplelist"><a class="xref" href="sql-cluster.html" title="CLUSTER"><span class="refentrytitle">CLUSTER</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="reference-client.html" title="PostgreSQL Client Applications">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="reference-client.html" title="PostgreSQL Client Applications">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="app-createdb.html" title="createdb">Next</a></td></tr><tr><td width="40%" align="left" valign="top">PostgreSQL Client Applications </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"> <span xmlns="http://www.w3.org/1999/xhtml" class="application">createdb</span></td></tr></table></div></body></html>
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