数据库系统

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vacuumdb.sgml：源码内容
							<refentry id="APP-VACUUMDB">
 <refmeta>
  <refentrytitle>
   <application>vacuumdb</application>
  </refentrytitle>
  <refmiscinfo>Application</refmiscinfo>
 </refmeta>
 <refnamediv>
  <refname id="vacuumdb">
   <application>vacuumdb</application>
  </refname>
  <refpurpose>
   Clean and analyze a <productname>Postgres</productname> database
  </refpurpose>
 </refnamediv>
 <refsynopsisdiv>
  <refsynopsisdivinfo>
   <date>1998-10-04</date>
  </refsynopsisdivinfo>
  <synopsis>
vacuumdb [ --analyze | -z ] [ --verbose | -v ] [ <replaceable
    class="parameter">dbname</replaceable> ]
vacuumdb [ -h <replaceable class="parameter">host</replaceable> ] [ -p
   <replaceable class="parameter">port</replaceable> ]
    [ --table '<replaceable class="parameter">table</replaceable> [ (
   <replaceable class="parameter">column</replaceable> [,...] ) ]' ]
    [ <replaceable class="parameter">dbname</replaceable> ]
  </synopsis>
  <refsect2 id="R2-APP-VACUUMDB-1">
   <refsect2info>
    <date>1998-10-04</date>
   </refsect2info>
   <title>
    Inputs
   </title>
   <para>
    <application>vacuumdb</application> accepts the following command line arguments:
    
    <variablelist>
     <varlistentry>
      <term>
       <replaceable class="parameter">dbname</replaceable>
      </term>
      <listitem>
       <para>
	Specifies the name of the database to be cleaned or analyzed.
	<replaceable class="parameter">dbname</replaceable>
	defaults to the value of the
	<envar>USER</envar>
	environment variable.
       </para>
      </listitem>
     </varlistentry>
     
     <varlistentry>
      <term>
       --analyze
      </term>
      <term>
       -z
      </term>
      <listitem>
       <para>
	Calculate statistics on the database for use by the optimizer.
       </para>
      </listitem>
     </varlistentry>
     
     <varlistentry>
      <term>
       --verbose
      </term>
      <term>
       -v
      </term>
      <listitem>
       <para>
	Print detailed information during processing.
       </para>
      </listitem>
     </varlistentry>
     
     <varlistentry>
      <term>
       --table <replaceable class="parameter">table</replaceable> [
       (<replaceable class="parameter">column</replaceable> [,...]) ]
      </term>
      <term>
       -t <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>
      </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>
      <listitem>
       <para>
	Specifies the hostname of the machine on which the 
	<application>postmaster</application>
	is running.  Defaults to using a local Unix domain socket
	rather than an IP connection..
       </para>
      </listitem>
     </varlistentry>
     
     <varlistentry>
      <term>
       -p <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.  The port number defaults to 5432,
	or the value of the <envar>PGPORT</envar>
	environment variable (if set).
       </para>
      </listitem>
     </varlistentry>
     
     <varlistentry>
      <term>
       -u
      </term>
      <listitem>
       <para>
	Use password authentication. 
	Prompts for
	<replaceable class="parameter">username</replaceable>
	and <replaceable class="parameter">password</replaceable>.
       </para>
      </listitem>
     </varlistentry>
    </variablelist>
   </para>
  </refsect2>
  <refsect2 id="R2-APP-VACUUMDB-2">
   <refsect2info>
    <date>1998-10-04</date>
   </refsect2info>
   <title>
    Outputs
   </title>
   <para>
    <application>vacuumdb</application> executes a <command>VACUUM</command> command
    on the specified database, so has not explicit external output.
    <variablelist>
     <varlistentry>
      <term>
       ERROR:  Can't vacuum columns, only tables.  You can 'vacuum analyze' columns.
       vacuumdb: database vacuum failed on <replaceable
	class="parameter">dbname</replaceable>.
      </term>
      <listitem>
       <para>
	The non-analyze mode requires cleaning full tables or databases.
	Individual columns may be specified only when analyzing a specific table.
       </para>
      </listitem>
     </varlistentry>
     <varlistentry>
      <term>
       Connection to database 'template1' failed.
       connectDB() failed: Is the postmaster running and accepting connections
       at 'UNIX Socket' on port '<replaceable class="parameter">port</replaceable>'?
      </term>
      <listitem>
       <para>
	<application>vacuumdb</application> could not attach to the 
	<application>postmaster</application> 
	process on the specified host and port.  If you see this message,
	ensure that the <application>postmaster</application> 
	is running on the proper host and that you have specified the proper
	port.  If your site uses an authentication system, ensure that you
	have obtained the required authentication credentials.
       </para>
      </listitem>
     </varlistentry>
     <varlistentry>
      <term>
       Connection to database '<replaceable class="parameter">dbname</replaceable>' failed.
       FATAL 1:  SetUserId: user '<replaceable class="parameter">username</replaceable>' is not in 'pg_shadow'
      </term>
      <listitem>
       <para>
	You do not have a valid entry in the relation <literal>pg_shadow</literal>
	and and will not be allowed to access <productname>Postgres</productname>. 
	Contact your <productname>Postgres</productname> administrator.
       </para>
      </listitem>
     </varlistentry>
     
    </variablelist>
   </para>
   <note>
    <para>
     <application>vacuumdb</application> internally executes a
     <command>VACUUM</command> <acronym>SQL</acronym> statement. 
     If you have problems running <application>vacuumdb</application>,
     make sure you are able to run <command>VACUUM</command> on the database using, for
     example, <application>psql</application>.
    </para>
   </note>
  </refsect2>
 </refsynopsisdiv>
 
 <refsect1 id="R1-APP-VACUUMDB-1">
  <refsect1info>
   <date>1998-10-04</date>
  </refsect1info>
  <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>
 </refsect1>
 <refsect1 id="R1-APP-VACUUMDB-2">
  <refsect1info>
   <date>1998-10-04</date>
  </refsect1info>
  <title>
   Notes
  </title>
  
  <para>
   See <xref endterm="vacuum" linkend="vacuum"> for more details.
  </para>
 </refsect1>
 
 <refsect1 id="R1-APP-VACUUMDB-3">
  <refsect1info>
   <date>1998-10-04</date>
  </refsect1info>
  <title>
   Usage
  </title>
  <para>
   To clean a database of the same name as the user:
   
   <programlisting>
    % vacuumdb
   </programlisting>
  </para>
  <para>
   To analyze a database named <literal>bigdb</literal> for the optimizer:
   <programlisting>
    % vacuumdb --analyze bigdb
   </programlisting>
  </para>
  <para>
   To analyze a single column <literal>bar</literal> in table <literal>foo</literal>
   in a database named <literal>xyzzy</literal> for the optimizer:
   
   <programlisting>
    % vacuumdb --analyze --verbose --table 'foo(bar)' xyzzy
   </programlisting>
  </para>
 </refsect1>
</refentry>
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