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Docs for pg_archivecleanup

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Simon Riggs 2010-06-14 17:25:24 +00:00
parent ca65f2190a
commit 24bfbb5857
3 changed files with 162 additions and 2 deletions
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doc/src/sgml/contrib.sgml
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<!-- $PostgreSQL: pgsql/doc/src/sgml/contrib.sgml,v 1.17 2010/05/12 02:19:11 momjian Exp $ --> <!-- $PostgreSQL: pgsql/doc/src/sgml/contrib.sgml,v 1.18 2010/06/14 17:25:24 sriggs Exp $ -->
<appendix id="contrib"> <appendix id="contrib">
<title>Additional Supplied Modules</title> <title>Additional Supplied Modules</title>
@ -101,6 +101,7 @@ psql -d dbname -f <replaceable>SHAREDIR</>/contrib/<replaceable>module</>.sql
&oid2name; &oid2name;
&pageinspect; &pageinspect;
&passwordcheck; &passwordcheck;
&pgarchivecleanup;
&pgbench; &pgbench;
&pgbuffercache; &pgbuffercache;
&pgcrypto; &pgcrypto;

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doc/src/sgml/filelist.sgml
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<!-- $PostgreSQL: pgsql/doc/src/sgml/filelist.sgml,v 1.68 2010/05/12 02:19:11 momjian Exp $ --> <!-- $PostgreSQL: pgsql/doc/src/sgml/filelist.sgml,v 1.69 2010/06/14 17:25:24 sriggs Exp $ -->
<!entity history SYSTEM "history.sgml"> <!entity history SYSTEM "history.sgml">
<!entity info SYSTEM "info.sgml"> <!entity info SYSTEM "info.sgml">
@ -114,6 +114,7 @@
<!entity pageinspect SYSTEM "pageinspect.sgml"> <!entity pageinspect SYSTEM "pageinspect.sgml">
<!entity passwordcheck SYSTEM "passwordcheck.sgml"> <!entity passwordcheck SYSTEM "passwordcheck.sgml">
<!entity pgbench SYSTEM "pgbench.sgml"> <!entity pgbench SYSTEM "pgbench.sgml">
<!entity pgarchivecleanup SYSTEM "pgarchivecleanup.sgml">
<!entity pgbuffercache SYSTEM "pgbuffercache.sgml"> <!entity pgbuffercache SYSTEM "pgbuffercache.sgml">
<!entity pgcrypto SYSTEM "pgcrypto.sgml"> <!entity pgcrypto SYSTEM "pgcrypto.sgml">
<!entity pgfreespacemap SYSTEM "pgfreespacemap.sgml"> <!entity pgfreespacemap SYSTEM "pgfreespacemap.sgml">

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doc/src/sgml/pgarchivecleanup.sgml Normal file
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<!-- $PostgreSQL: pgsql/doc/src/sgml/pgarchivecleanup.sgml,v 1.1 2010/06/14 17:25:24 sriggs Exp $ -->
<sect1 id="pgarchivecleanup">
<title>pg_archivecleanup</title>
<indexterm zone="pgarchivecleanup">
<primary>pg_archivecleanup</primary>
</indexterm>
<para>
<application>pg_archivecleanup</> is designed to cleanup an archive when used
as an <literal>archive_cleanup_command</literal> when running with
<literal>standby_mode = on</literal>. <application>pg_archivecleanup</> can
also be used as a standalone program to clean WAL file archives.
</para>
<para>
<application>pg_archivecleanup</application> features include:
</para>
<itemizedlist>
<listitem>
<para>
Written in C, so very portable and easy to install
</para>
</listitem>
<listitem>
<para>
Easy-to-modify source code, with specifically designated
sections to modify for your own needs
</para>
</listitem>
</itemizedlist>
<sect2>
<title>Usage</title>
<para>
To configure a standby
server to use <application>pg_archivecleanup</>, put this into its
<filename>recovery.conf</filename> configuration file:
</para>
<programlisting>
archive_cleanup_command = 'pg_archivecleanup <replaceable>archiveDir</> %r'
</programlisting>
<para>
where <replaceable>archiveDir</> is the directory from which WAL segment
files should be restored.
</para>
<para>
When used within <literal>archive_cleanup_command</literal>,
all WAL files logically preceding the value of the <literal>%r</>
will be removed <replaceable>archivelocation</>. This minimizes
the number of files that need to be retained, while preserving
crash-restart capability. Use of this parameter is appropriate if the
<replaceable>archivelocation</> is a transient staging area for this
particular standby server, but <emphasis>not</> when the
<replaceable>archivelocation</> is intended as a long-term WAL archive area.
</para>
<para>
The full syntax of <application>pg_archivecleanup</>'s command line is
</para>
<synopsis>
pg_archivecleanup <optional> <replaceable>option</> ... </optional> <replaceable>archivelocation</> <replaceable>restartwalfile</>
</synopsis>
<para>
When used as a standalone program all WAL files logically preceding the
<literal>restartwalfile</> will be removed <replaceable>archivelocation</>.
In this mode, if you specify a .backup filename, then only the file prefix
will be used as the <literal>restartwalfile</>. This allows you to remove
all WAL files archived prior to a specific base backup without error.
For example, the following example will remove all files older than
WAL filename 000000010000003700000010:
</para>
<programlisting>
pg_archivecleanup -d archive 000000010000003700000010.00000020.backup
pg_archivecleanup: keep WAL files 000000010000003700000010 and later
pg_archivecleanup: removing "archive/00000001000000370000000F"
pg_archivecleanup: removing "archive/00000001000000370000000E"
</programlisting>
<para>
<application>pg_archivecleanup</application> assumes that
<replaceable>archivelocation</> is a directory readable and writable by the
server-owning user.
</para>
</sect2>
<sect2>
<title><application>pg_archivecleanup</> Options</title>
<para>
<application>pg_archivecleanup</application> accepts the following command-line arguments:
<variablelist>
<varlistentry>
<term><option>-d</option></term>
<listitem>
<para>
Print lots of debug logging output on <filename>stderr</>.
</para>
</listitem>
</varlistentry>
</variablelist>
</para>
</sect2>
<sect2>
<title>Examples</title>
<para>On Linux or Unix systems, you might use:</para>
<programlisting>
archive_cleanup_command = 'pg_archivecleanup -d .../archive %r 2>>cleanup.log'
</programlisting>
<para>
where the archive directory is physically located on the standby server,
so that the <literal>archive_command</> is accessing it across NFS,
but the files are local to the standby.
This will:
</para>
<itemizedlist>
<listitem>
<para>
produce debugging output in <filename>standby.log</>
</para>
</listitem>
<listitem>
<para>
remove no-longer-needed files from the archive directory
</para>
</listitem>
</itemizedlist>
</sect2>
<sect2>
<title>Supported server versions</title>
<para>
<application>pg_archivecleanup</application> is designed to work with
<productname>PostgreSQL</> 8.0 and later when used as a standalone utility,
or with <productname>PostgreSQL</> 9.0 and later when used as an
archive cleanup command.
</para>
</sect2>
<sect2>
<title>Author</title>
<para>
Simon Riggs <email>simon@2ndquadrant.com</email>
</para>
</sect2>
</sect1>