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$Header: /cvsroot/pgsql/doc/src/sgml/ref/clusterdb.sgml,v 1.13 2003/09/09 18:28:52 tgl Exp $
PostgreSQL documentation
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<refentry id="APP-CLUSTERDB">
 <refmeta>
  <refentrytitle id="APP-CLUSTERDB-TITLE"><application>clusterdb</application></refentrytitle>
  <manvolnum>1</manvolnum>
  <refmiscinfo>Application</refmiscinfo>
 </refmeta>

 <refnamediv>
  <refname id="clusterdb">clusterdb</refname>
  <refpurpose>cluster a <productname>PostgreSQL</productname> database</refpurpose>
 </refnamediv>

 <indexterm zone="app-clusterdb">
  <primary>clusterdb</primary>
 </indexterm>

 <refsynopsisdiv>
  <cmdsynopsis>
   <command>clusterdb</command>
   <arg rep="repeat"><replaceable>connection-option</replaceable></arg>
   <arg>--table | -t <replaceable>table</replaceable> </arg>
   <arg><replaceable>dbname</replaceable></arg>
   <sbr>
   <command>clusterdb</command>
   <arg rep="repeat"><replaceable>connection-option</replaceable></arg>
   <group><arg>--all</arg><arg>-a</arg></group>
  </cmdsynopsis>
 </refsynopsisdiv>
 

 <refsect1>
  <title>Description</title>

  <para>
   <application>clusterdb</application> is a utility for reclustering tables
   in a <productname>PostgreSQL</productname> 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.
  </para>

  <para>
   <application>clusterdb</application> is a wrapper around the SQL
   command <xref linkend="SQL-CLUSTER" endterm="sql-cluster-title">.
   There is no effective difference between clustering databases via
   this or other methods.  The database server must be running at the
   targeted host.  Also, any default settings and environment
   variables used by the <application>libpq</application> front-end
   library will apply.
  </para>

  <para>
   In case of difficulty, see <xref linkend="SQL-CLUSTER"
   endterm="sql-cluster-title"> and <xref linkend="APP-PSQL"> for
   discussions of potential problems and error messages.
  </para>

 </refsect1>


 <refsect1>
  <title>Options</title>

   <para>
    <application>clusterdb</application> accepts the following command-line arguments:
    
    <variablelist>
     <varlistentry>
      <term><option>-a</></term>
      <term><option>--all</></term>
      <listitem>
       <para>
	Cluster all databases.
       </para>
      </listitem>
     </varlistentry>

     <varlistentry>
      <term><option><optional>-d</> <replaceable class="parameter">dbname</replaceable></></term>
      <term><option><optional>--dbname</> <replaceable class="parameter">dbname</replaceable></></term>
      <listitem>
       <para>
	Specifies the name of the database to be clustered.
	If this is not specified and <option>-a</option> (or
	<option>--all</option>) is not used, the database name is read
	from the environment variable <envar>PGDATABASE</envar>.  If
	that is not set, the user name specified for the connection is
	used.
       </para>
      </listitem>
     </varlistentry>

     <varlistentry>
      <term><option>-e</></term>
      <term><option>--echo</></term>
      <listitem>
       <para>
        Echo the commands that <application>clusterdb</application> generates
	and sends to the server.
       </para>
      </listitem>
     </varlistentry>

     <varlistentry>
      <term><option>-q</></term>
      <term><option>--quiet</></term>
      <listitem>
       <para>
        Do not display a response.
       </para>
      </listitem>
     </varlistentry>

     <varlistentry>
      <term><option>-t <replaceable class="parameter">table</replaceable></></term>
      <term><option>--table <replaceable class="parameter">table</replaceable></></term>
      <listitem>
       <para>
	Cluster <replaceable class="parameter">table</replaceable> only.
       </para>
      </listitem>
     </varlistentry>

    </variablelist>
   </para>

   <para>
    <application>clusterdb</application> also accepts 
    the following command-line arguments for connection parameters:

    <variablelist>
     <varlistentry>
      <term><option>-h <replaceable class="parameter">host</replaceable></></term>
      <term><option>--host <replaceable class="parameter">host</replaceable></></term>
      <listitem>
       <para>
	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.
       </para>
      </listitem>
     </varlistentry>

     <varlistentry>
      <term><option>-p <replaceable class="parameter">port</replaceable></></term>
      <term><option>--port <replaceable class="parameter">port</replaceable></></term>
      <listitem>
       <para>
	Specifies the TCP port or local Unix domain socket file 
	extension on which the server
	is listening for connections.
       </para>
      </listitem>
     </varlistentry>

     <varlistentry>
      <term><option>-U <replaceable class="parameter">username</replaceable></></term>
      <term><option>--username <replaceable class="parameter">username</replaceable></></term>
      <listitem>
       <para>
        User name to connect as.
       </para>
      </listitem>
     </varlistentry>

     <varlistentry>
      <term><option>-W</></term>
      <term><option>--password</></term>
      <listitem>
       <para>
        Force password prompt.
       </para>
      </listitem>
     </varlistentry>
    </variablelist>
   </para>
 </refsect1>


 <refsect1>
  <title>Environment</title>

  <variablelist>
   <varlistentry>
    <term><envar>PGDATABASE</envar></term>
    <term><envar>PGHOST</envar></term>
    <term><envar>PGPORT</envar></term>
    <term><envar>PGUSER</envar></term>

    <listitem>
     <para>
      Default connection parameters
     </para>
    </listitem>
   </varlistentry>
  </variablelist>
 </refsect1>


 <refsect1>
  <title>Examples</title>

   <para>
    To cluster the database <literal>test</literal>:
<screen>
<prompt>$ </prompt><userinput>clusterdb test</userinput>
</screen>
   </para>

   <para>
    To cluster a single table
    <literal>foo</literal> in a database named
    <literal>xyzzy</literal>:
<screen>
<prompt>$ </prompt><userinput>clusterdb --table foo xyzzy</userinput>
</screen>
   </para>

 </refsect1>

 <refsect1>
  <title>See Also</title>

  <simplelist type="inline">
   <member><xref linkend="sql-cluster" endterm="sql-cluster-title"></member>
  </simplelist>
 </refsect1>

</refentry>

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