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><H1
><A
NAME="APP-CLUSTERDB"
></A
><SPAN
CLASS="APPLICATION"
>clusterdb</SPAN
></H1
><DIV
CLASS="REFNAMEDIV"
><A
NAME="AEN79974"
></A
><H2
>Name</H2
>clusterdb&nbsp;--&nbsp;cluster a <SPAN
CLASS="PRODUCTNAME"
>PostgreSQL</SPAN
> database</DIV
><DIV
CLASS="REFSYNOPSISDIV"
><A
NAME="AEN79980"
></A
><H2
>Synopsis</H2
><P
><TT
CLASS="COMMAND"
>clusterdb</TT
> [<TT
CLASS="REPLACEABLE"
><I
>connection-option</I
></TT
>...] [<TT
CLASS="OPTION"
>--verbose</TT
> | <TT
CLASS="OPTION"
>-v</TT
>] [ <TT
CLASS="OPTION"
>--table</TT
> | <TT
CLASS="OPTION"
>-t</TT
>  <TT
CLASS="REPLACEABLE"
><I
>table</I
></TT
> ] [<TT
CLASS="REPLACEABLE"
><I
>dbname</I
></TT
>]</P
><P
><TT
CLASS="COMMAND"
>clusterdb</TT
> [<TT
CLASS="REPLACEABLE"
><I
>connection-option</I
></TT
>...] [<TT
CLASS="OPTION"
>--verbose</TT
> | <TT
CLASS="OPTION"
>-v</TT
>]  <TT
CLASS="OPTION"
>--all</TT
> | <TT
CLASS="OPTION"
>-a</TT
> </P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN80013"
></A
><H2
>Description</H2
><P
>   <SPAN
CLASS="APPLICATION"
>clusterdb</SPAN
> is a utility for reclustering tables
   in a <SPAN
CLASS="PRODUCTNAME"
>PostgreSQL</SPAN
> 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.
  </P
><P
>   <SPAN
CLASS="APPLICATION"
>clusterdb</SPAN
> is a wrapper around the SQL
   command <A
HREF="sql-cluster.html"
>CLUSTER</A
>.
   There is no effective difference between clustering databases via
   this utility and via other methods for accessing the server.
  </P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN80021"
></A
><H2
>Options</H2
><P
>    <SPAN
CLASS="APPLICATION"
>clusterdb</SPAN
> accepts the following command-line arguments:

    <P
></P
></P><DIV
CLASS="VARIABLELIST"
><DL
><DT
><TT
CLASS="OPTION"
>-a</TT
><BR><TT
CLASS="OPTION"
>--all</TT
></DT
><DD
><P
>        Cluster all databases.
       </P
></DD
><DT
><TT
CLASS="OPTION"
>[<SPAN
CLASS="OPTIONAL"
>-d</SPAN
>] <TT
CLASS="REPLACEABLE"
><I
>dbname</I
></TT
></TT
><BR><TT
CLASS="OPTION"
>[<SPAN
CLASS="OPTIONAL"
>--dbname=</SPAN
>]<TT
CLASS="REPLACEABLE"
><I
>dbname</I
></TT
></TT
></DT
><DD
><P
>        Specifies the name of the database to be clustered.
        If this is not specified and <TT
CLASS="OPTION"
>-a</TT
> (or
        <TT
CLASS="OPTION"
>--all</TT
>) is not used, the database name is read
        from the environment variable <TT
CLASS="ENVAR"
>PGDATABASE</TT
>.  If
        that is not set, the user name specified for the connection is
        used.
       </P
></DD
><DT
><TT
CLASS="OPTION"
>-e</TT
><BR><TT
CLASS="OPTION"
>--echo</TT
></DT
><DD
><P
>        Echo the commands that <SPAN
CLASS="APPLICATION"
>clusterdb</SPAN
> generates
        and sends to the server.
       </P
></DD
><DT
><TT
CLASS="OPTION"
>-q</TT
><BR><TT
CLASS="OPTION"
>--quiet</TT
></DT
><DD
><P
>        Do not display progress messages.
       </P
></DD
><DT
><TT
CLASS="OPTION"
>-t <TT
CLASS="REPLACEABLE"
><I
>table</I
></TT
></TT
><BR><TT
CLASS="OPTION"
>--table=<TT
CLASS="REPLACEABLE"
><I
>table</I
></TT
></TT
></DT
><DD
><P
>        Cluster <TT
CLASS="REPLACEABLE"
><I
>table</I
></TT
> only.
       </P
></DD
><DT
><TT
CLASS="OPTION"
>-v</TT
><BR><TT
CLASS="OPTION"
>--verbose</TT
></DT
><DD
><P
>        Print detailed information during processing.
       </P
></DD
><DT
><TT
CLASS="OPTION"
>-V</TT
><BR><TT
CLASS="OPTION"
>--version</TT
></DT
><DD
><P
>      Print the <SPAN
CLASS="APPLICATION"
>clusterdb</SPAN
> version and exit.
      </P
></DD
><DT
><TT
CLASS="OPTION"
>-?</TT
><BR><TT
CLASS="OPTION"
>--help</TT
></DT
><DD
><P
>      Show help about <SPAN
CLASS="APPLICATION"
>clusterdb</SPAN
> command line
      arguments, and exit.
      </P
></DD
></DL
></DIV
><P>
   </P
><P
>    <SPAN
CLASS="APPLICATION"
>clusterdb</SPAN
> also accepts
    the following command-line arguments for connection parameters:

    <P
></P
></P><DIV
CLASS="VARIABLELIST"
><DL
><DT
><TT
CLASS="OPTION"
>-h <TT
CLASS="REPLACEABLE"
><I
>host</I
></TT
></TT
><BR><TT
CLASS="OPTION"
>--host=<TT
CLASS="REPLACEABLE"
><I
>host</I
></TT
></TT
></DT
><DD
><P
>        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.
       </P
></DD
><DT
><TT
CLASS="OPTION"
>-p <TT
CLASS="REPLACEABLE"
><I
>port</I
></TT
></TT
><BR><TT
CLASS="OPTION"
>--port=<TT
CLASS="REPLACEABLE"
><I
>port</I
></TT
></TT
></DT
><DD
><P
>        Specifies the TCP port or local Unix domain socket file
        extension on which the server
        is listening for connections.
       </P
></DD
><DT
><TT
CLASS="OPTION"
>-U <TT
CLASS="REPLACEABLE"
><I
>username</I
></TT
></TT
><BR><TT
CLASS="OPTION"
>--username=<TT
CLASS="REPLACEABLE"
><I
>username</I
></TT
></TT
></DT
><DD
><P
>        User name to connect as.
       </P
></DD
><DT
><TT
CLASS="OPTION"
>-w</TT
><BR><TT
CLASS="OPTION"
>--no-password</TT
></DT
><DD
><P
>        Never issue a password prompt.  If the server requires
        password authentication and a password is not available by
        other means such as a <TT
CLASS="FILENAME"
>.pgpass</TT
> file, the
        connection attempt will fail.  This option can be useful in
        batch jobs and scripts where no user is present to enter a
        password.
       </P
></DD
><DT
><TT
CLASS="OPTION"
>-W</TT
><BR><TT
CLASS="OPTION"
>--password</TT
></DT
><DD
><P
>        Force <SPAN
CLASS="APPLICATION"
>clusterdb</SPAN
> to prompt for a
        password before connecting to a database.
       </P
><P
>        This option is never essential, since
        <SPAN
CLASS="APPLICATION"
>clusterdb</SPAN
> will automatically prompt
        for a password if the server demands password authentication.
        However, <SPAN
CLASS="APPLICATION"
>clusterdb</SPAN
> will waste a
        connection attempt finding out that the server wants a password.
        In some cases it is worth typing <TT
CLASS="OPTION"
>-W</TT
> to avoid the extra
        connection attempt.
       </P
></DD
><DT
><TT
CLASS="OPTION"
>--maintenance-db=<TT
CLASS="REPLACEABLE"
><I
>dbname</I
></TT
></TT
></DT
><DD
><P
>         Specifies the name of the database to connect to discover what other
         databases should be clustered. If not specified, the
         <TT
CLASS="LITERAL"
>postgres</TT
> database will be used,
         and if that does not exist, <TT
CLASS="LITERAL"
>template1</TT
> will be used.
       </P
></DD
></DL
></DIV
><P>
   </P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN80153"
></A
><H2
>Environment</H2
><P
></P
><DIV
CLASS="VARIABLELIST"
><DL
><DT
><TT
CLASS="ENVAR"
>PGDATABASE</TT
><BR><TT
CLASS="ENVAR"
>PGHOST</TT
><BR><TT
CLASS="ENVAR"
>PGPORT</TT
><BR><TT
CLASS="ENVAR"
>PGUSER</TT
></DT
><DD
><P
>      Default connection parameters
     </P
></DD
></DL
></DIV
><P
>   This utility, like most other <SPAN
CLASS="PRODUCTNAME"
>PostgreSQL</SPAN
> utilities,
   also uses the environment variables supported by <SPAN
CLASS="APPLICATION"
>libpq</SPAN
>
   (see <A
HREF="libpq-envars.html"
>Section 31.14</A
>).
  </P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN80171"
></A
><H2
>Diagnostics</H2
><P
>   In case of difficulty, see <A
HREF="sql-cluster.html"
>CLUSTER</A
>
   and <A
HREF="app-psql.html"
><SPAN
CLASS="APPLICATION"
>psql</SPAN
></A
> 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 <SPAN
CLASS="APPLICATION"
>libpq</SPAN
> front-end
   library will apply.
  </P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN80177"
></A
><H2
>Examples</H2
><P
>    To cluster the database <TT
CLASS="LITERAL"
>test</TT
>:
</P><PRE
CLASS="SCREEN"
><SAMP
CLASS="PROMPT"
>$ </SAMP
><KBD
CLASS="USERINPUT"
>clusterdb test</KBD
></PRE
><P>
   </P
><P
>    To cluster a single table
    <TT
CLASS="LITERAL"
>foo</TT
> in a database named
    <TT
CLASS="LITERAL"
>xyzzy</TT
>:
</P><PRE
CLASS="SCREEN"
><SAMP
CLASS="PROMPT"
>$ </SAMP
><KBD
CLASS="USERINPUT"
>clusterdb --table foo xyzzy</KBD
></PRE
><P></P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN80190"
></A
><H2
>See Also</H2
><A
HREF="sql-cluster.html"
>CLUSTER</A
></DIV
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