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<chapter Id="runtime-config">

<title>Server Configuration</title>

(The path name is relative to the working directory of the server,

i.e., the cluster's data directory.)

Use <literal>%%</> to embed an actual <literal>%</> character in the

command. For more information see <xref

linkend="backup-archiving-wal">.

command. It is important for the command to return a zero

exit status only if it succeeds. For more information see

<xref linkend="backup-archiving-wal">.

</para>

<para>

This parameter can only be set in the <filename>postgresql.conf</>

file or on the server command line. It is ignored unless

<varname>archive_mode</> was enabled at server start.

archiving, but also breaks the chain of WAL files needed for

archive recovery, so it should only be used in unusual circumstances.

</para>

<para>

It is important for the command to return a zero exit status if

and only if it succeeds. Examples:

<programlisting>

archive_command = 'cp "%p" /mnt/server/archivedir/"%f"'

archive_command = 'copy "%p" "C:\\server\\archivedir\\%f"' # Windows

</programlisting>

</para>

</listitem>

</varlistentry>