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>pg_controldata</SPAN
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><H2
>Name</H2
>pg_controldata -- display control information of a <SPAN
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>PostgreSQL</SPAN
> database cluster</DIV
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><H2
>Synopsis</H2
><P
><TT
CLASS="COMMAND"
>pg_controldata</TT
> [<TT
CLASS="REPLACEABLE"
><I
>option</I
></TT
>] [<TT
CLASS="REPLACEABLE"
><I
>datadir</I
></TT
>]</P
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><H2
>Description</H2
><P
> <TT
CLASS="COMMAND"
>pg_controldata</TT
> prints information initialized during
<TT
CLASS="COMMAND"
>initdb</TT
>, such as the catalog version.
It also shows information about write-ahead logging and checkpoint
processing. This information is cluster-wide, and not specific to any one
database.
</P
><P
> This utility can only be run by the user who initialized the cluster because
it requires read access to the data directory.
You can specify the data directory on the command line, or use
the environment variable <TT
CLASS="ENVAR"
>PGDATA</TT
>. This utility supports the options
<TT
CLASS="OPTION"
>-V</TT
> and <TT
CLASS="OPTION"
>--version</TT
>, which print the
<SPAN
CLASS="APPLICATION"
>pg_controldata</SPAN
> version and exit. It also
supports options <TT
CLASS="OPTION"
>-?</TT
> and <TT
CLASS="OPTION"
>--help</TT
>, which output the
supported arguments.
</P
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><H2
>Environment</H2
><P
></P
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><DL
><DT
><TT
CLASS="ENVAR"
>PGDATA</TT
></DT
><DD
><P
> Default data directory location
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