PostgreSQL
F.22. old_snapshot
The old_snapshot module allows inspection of the server state that is used to implement old_snapshot_threshold.
F.22.1. 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.
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