Postgresql 中文操作指南

F.24. old_snapshot — inspect old_snapshot_threshold state #

_old_snapshot_模块允许检查用于实现 old_snapshot_threshold的服务器状态。

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

F.24.1. 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.