old\_snapshot {#oldsnapshot}
=============

old\_snapshot

The `old_snapshot` module allows inspection of the server state that is
used to implement [???](#guc-old-snapshot-threshold).

Functions
---------

`pg_old_snapshot_time_mapping(array_offset OUT int4, end_timestamp OUT timestamptz, newest_xmin OUT xid) returns setof record`

:   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.
