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$Header: /cvsroot/pgsql/doc/src/sgml/ref/clusterdb.sgml,v 1.7 2003/02/19 04:06:28 momjian 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>

 <refsynopsisdiv>
  <cmdsynopsis>
   <command>clusterdb</command>
   <arg rep="repeat"><replaceable>connection-options</replaceable></arg>
   <arg>--table | -t <replaceable>table</replaceable> </arg>
   <arg><replaceable>dbname</replaceable></arg>
   <sbr>
   <command>clusterdb</command>
   <arg rep="repeat"><replaceable>connection-options</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 shell script wrapper around the
   backend command
   <xref linkend="SQL-CLUSTER" endterm="SQL-CLUSTER-title"> via
   the <productname>PostgreSQL</productname> interactive terminal
   <xref linkend="APP-PSQL">. There is no effective
   difference between clustering databases via this or other methods.
   <application>psql</application> must be found by the script and
   a database server must be running at the targeted host. Also, any default
   settings and environment variables available to <application>psql</application>
   and the <application>libpq</application> front-end library do apply.
  </para>

  <para>
  <application>clusterdb</application> might need to connect several
  times to the <productname>PostgreSQL</productname> server, asking for
  a password each time. It is convenient to have a
  <filename>$HOME/.pgpass</> file in such cases.
  </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>
	Clusters <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 host 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 Internet TCP/IP 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>Diagnostics</title>

   <para>
    <variablelist>
     <varlistentry>
      <term><computeroutput>CLUSTER</computeroutput></term>
      <listitem>
       <para>
        Everything went well.
       </para>
      </listitem>
     </varlistentry>

     <varlistentry>
      <term><computeroutput>clusterdb: Cluster failed.</computeroutput></term>
      <listitem>
       <para>
        Something went wrong. <application>clusterdb</application> is only a wrapper
        script. See <xref linkend="SQL-CLUSTER" endterm="SQL-CLUSTER-title">
        and <xref linkend="APP-PSQL"> for a detailed
        discussion of error messages and potential problems.  Note that this message
		may appear once per table to be clustered.
       </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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