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<refentry id="APP-VACUUMDB">
 <docinfo>
  <date>2000-11-11</date>
 </docinfo>

 <refmeta>
  <refentrytitle id="APP-VACUUMDB-TITLE"><application>vacuumdb</application></refentrytitle>
  <manvolnum>1</manvolnum>
  <refmiscinfo>Application</refmiscinfo>
 </refmeta>

 <refnamediv>
  <refname id="vacuumdb">vacuumdb</refname>
  <refpurpose>Clean and analyze a <productname>Postgres</productname> database</refpurpose>
 </refnamediv>

 <refsynopsisdiv>
  <cmdsynopsis>
   <command>vacuumdb</command>
   <arg rep="repeat"><replaceable>connection-options</replaceable></arg>
   <arg><arg>-d</arg> <replaceable>dbname</replaceable></arg>
   <group><arg>--analyze</arg><arg>-z</arg></group>
   <group><arg>--verbose</arg><arg>-v</arg></group>
   <sbr>
   <arg>--table '<replaceable>table</replaceable>
    <arg>( <replaceable class="parameter">column</replaceable> [,...] )</arg>'
   </arg>
   <sbr>
   <command>vacuumdb</command>
   <arg rep="repeat"><replaceable>connection-options</replaceable></arg>
   <group><arg>--all</arg><arg>-a</arg></group>
   <group><arg>--analyze</arg><arg>-z</arg></group>
   <group><arg>--verbose</arg><arg>-v</arg></group>
  </cmdsynopsis>

  <refsect2 id="R2-APP-VACUUMDB-1">
   <title>
    Inputs
   </title>
   <para>
    <application>vacuumdb</application> accepts the following command line arguments:
    
    <variablelist>
     <varlistentry>
      <term>-d <replaceable class="parameter">dbname</replaceable></term>
      <term>--dbname <replaceable class="parameter">dbname</replaceable></term>
      <listitem>
       <para>
	Specifies the name of the database to be cleaned or analyzed.
       </para>
      </listitem>
     </varlistentry>

     <varlistentry>
      <term>-z</term>
      <term>--analyze</term>
      <listitem>
       <para>
	Calculate statistics on the database for use by the optimizer.
       </para>
      </listitem>
     </varlistentry>

     <varlistentry>
      <term>-a</term>
      <term>--alldb</term>
      <listitem>
       <para>
	Vacuum all databases.
       </para>
      </listitem>
     </varlistentry>

     <varlistentry>
      <term>-v</term>
      <term>--verbose</term>
      <listitem>
       <para>
	Print detailed information during processing.
       </para>
      </listitem>
     </varlistentry>

     <varlistentry>
      <term>-t <replaceable class="parameter">table</replaceable> [ (<replaceable class="parameter">column</replaceable> [,...]) ]</term>
      <term>--table <replaceable class="parameter">table</replaceable> [ (<replaceable class="parameter">column</replaceable> [,...]) ]</term>
      <listitem>
       <para>
	Clean or analyze <replaceable class="parameter">table</replaceable> only.
	Column names may be specified only in conjunction with
	the <option>--analyze</option> option.
       </para>
       <tip>
        <para>
         If you specify columns to vacuum, you probably have to escape the parentheses
         from the shell.
        </para>
       </tip>
      </listitem>
     </varlistentry>

    </variablelist>
   </para>

   <para>
    <application>vacuumdb</application> also accepts 
    the following command line arguments for connection parameters:
    
    <variablelist>
     <varlistentry>
      <term>-h <replaceable class="parameter">host</replaceable></term>
      <term>--host <replaceable class="parameter">host</replaceable></term>
      <listitem>
       <para>
	Specifies the hostname of the machine on which the 
	<application>postmaster</application>
	is running.  If host begins with a slash, it is used 
	as the path to a unix domain socket.
       </para>
      </listitem>
     </varlistentry>

     <varlistentry>
      <term>-p <replaceable class="parameter">port</replaceable></term>
      <term>--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 <application>postmaster</application>
	is listening for connections.
       </para>
      </listitem>
     </varlistentry>

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

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

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

     <varlistentry>
      <term>-q</term>
      <term>--quiet</term>
      <listitem>
       <para>
        Do not display a response.
       </para>
      </listitem>
     </varlistentry>
    </variablelist>
   </para>
  </refsect2>

  <refsect2 id="R2-APP-VACUUMDB-2">
   <title>
    Outputs
   </title>
   <para>
    <variablelist>
     <varlistentry>
      <term><computeroutput>VACUUM</computeroutput></term>
      <listitem>
       <para>
        Everything went well.
       </para>
      </listitem>
     </varlistentry>

     <varlistentry>
      <term><computeroutput>vacuumdb: Vacuum failed.</computeroutput></term>
      <listitem>
       <para>
        Something went wrong. <application>vacuumdb</application> is only a wrapper
        script. See <xref linkend="SQL-VACUUM" endterm="SQL-VACUUM-title">
        and <xref linkend="APP-PSQL" endterm="APP-PSQL-title"> for a detailed
        discussion of error messages and potential problems.
       </para>
      </listitem>
     </varlistentry>

    </variablelist>
   </para>

   <para>
   </para>

  </refsect2>
 </refsynopsisdiv>
 
 <refsect1 id="R1-APP-VACUUMDB-1">
  <title>
   Description
  </title>

  <para>
   <application>vacuumdb</application> is a utility for cleaning a
   <productname>Postgres</productname> database.
   <application>vacuumdb</application> will also generate internal statistics
   used by the <productname>Postgres</productname> query optimizer.
  </para>

  <para>
   <application>vacuumdb</application> is a shell script wrapper around the
   backend command
   <xref linkend="SQL-VACUUM" endterm="SQL-VACUUM-title"> via
   the <productname>Postgres</productname> interactive terminal
   <xref linkend="APP-PSQL" endterm="APP-PSQL-title">. There is no effective
   difference between vacuuming 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>

 </refsect1>

 <refsect1 id="R1-APP-VACUUMDB-3">
  <title>Usage</title>

  <informalexample>
   <para>
    To clean the database <literal>test</literal>:
<screen>
<prompt>$ </prompt><userinput>vacuumdb test</userinput>
</screen>
   </para>
  </informalexample>

  <informalexample>
   <para>
    To analyze for the optimzer a database named
    <literal>bigdb</literal>:
<screen>
<prompt>$ </prompt><userinput>vacuumdb --analyze bigdb</userinput>
</screen>
   </para>
  </informalexample>

  <informalexample>
   <para>
    To analyze a single column <literal>bar</literal> in table
    <literal>foo</literal> in a database named
    <literal>xyzzy</literal> for the optimizer:
<screen>
<prompt>$ </prompt><userinput>vacuumdb --analyze --verbose --table 'foo(bar)' xyzzy</userinput>
</screen>
   </para>
  </informalexample>

 </refsect1>
</refentry>

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