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| -rw-r--r-- | doc/src/sgml/oldsnapshot.sgml | 33 |
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diff --git a/doc/src/sgml/oldsnapshot.sgml b/doc/src/sgml/oldsnapshot.sgml new file mode 100644 index 0000000..a665ae7 --- /dev/null +++ b/doc/src/sgml/oldsnapshot.sgml @@ -0,0 +1,33 @@ +<!-- 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> |