vacuumdb.sgml

PostgreSQL 8.1.4的源码 适用于Linux下的开源数据库系统

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$PostgreSQL: pgsql/doc/src/sgml/ref/vacuumdb.sgml,v 1.36 2005/05/29 03:32:18 momjian Exp $
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<refentry id="APP-VACUUMDB">
 <refmeta>
  <refentrytitle id="APP-VACUUMDB-TITLE"><application>vacuumdb</application></refentrytitle>
  <manvolnum>1</manvolnum>
  <refmiscinfo>Application</refmiscinfo>
 </refmeta>

 <refnamediv>
  <refname id="vacuumdb">vacuumdb</refname>
  <refpurpose>garbage-collect and analyze a <productname>PostgreSQL</productname> database</refpurpose>
 </refnamediv>

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

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

 <refsect1>
  <title>Description</title>

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

  <para>
   <application>vacuumdb</application> is a wrapper around the SQL
   command <xref linkend="SQL-VACUUM" endterm="SQL-VACUUM-title">.
   There is no effective difference between vacuuming databases via
   this utility and via other methods for accessing the server.
  </para>

 </refsect1>


 <refsect1>
  <title>Options</title>

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

     <varlistentry>
      <term><option><optional>-d</> <replaceable class="parameter">dbname</replaceable></option></term>
      <term><option><optional>--dbname</> <replaceable class="parameter">dbname</replaceable></option></term>
      <listitem>
       <para>
        Specifies the name of the database to be cleaned or analyzed.
        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>vacuumdb</application> generates
        and sends to the server.
       </para>
      </listitem>
     </varlistentry>

     <varlistentry>
      <term><option>-f</option></term>
      <term><option>--full</option></term>
      <listitem>
       <para>
        Perform <quote>full</quote> vacuuming.
       </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> [ (<replaceable class="parameter">column</replaceable> [,...]) ]</option></term>
      <term><option>--table <replaceable class="parameter">table</replaceable> [ (<replaceable class="parameter">column</replaceable> [,...]) ]</option></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, you probably have to escape the parentheses
         from the shell.  (See examples below.)
        </para>
       </tip>
      </listitem>
     </varlistentry>

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

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

   <para>
    <application>vacuumdb</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>Diagnostics</title>

  <para>
   In case of difficulty, see <xref linkend="SQL-VACUUM"
   endterm="sql-vacuum-title"> and <xref linkend="APP-PSQL"> 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 <application>libpq</application> front-end
   library will apply.
  </para>

 </refsect1>


 <refsect1>
  <title>Notes</title>

  <para>
   <application>vacuumdb</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>~/.pgpass</> file in such cases. See <xref
   linkend="libpq-pgpass"> for more information.
  </para>
 </refsect1>

 <refsect1>
  <title>Examples</title>

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

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

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

 </refsect1>

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

  <simplelist type="inline">
   <member><xref linkend="sql-vacuum" endterm="sql-vacuum-title"></member>
   <member>Environment Variables (<xref linkend="libpq-envars">)</member>
  </simplelist>
 </refsect1>

</refentry>

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