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<!-- doc/src/sgml/oldsnapshot.sgml -->
<sect1 id="oldsnapshot" xreflabel="old_snapshot">
<title>old_snapshot</title>
<indexterm zone="oldsnapshot">
<primary>old_snapshot</primary>
</indexterm>
<para>
The <filename>old_snapshot</filename> module allows inspection
of the server state that is used to implement
<xref linkend="guc-old-snapshot-threshold" />.
</para>
<sect2>
<title>Functions</title>
<variablelist>
<varlistentry>
<term><function>pg_old_snapshot_time_mapping(array_offset OUT int4, end_timestamp OUT timestamptz, newest_xmin OUT xid) returns setof record</function></term>
<listitem>
<para>
Returns all of the entries in the server's timestamp to XID mapping.
Each entry represents the newest xmin of any snapshot taken in the
corresponding minute.
</para>
</listitem>
</varlistentry>
</variablelist>
</sect2>
</sect1>
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