On Thu, 2022-12-08 at 21:01 +0530, Satalabaha Postgres wrote: > I would like to understand the possible causes for backend_xmin getting > populated in pg_stat_activity. Can someone throw some light on this? "backend_xid" is set when the session has an open transaction that has modified data and therefore got a transaction ID. "backend_xmin" is set if there is an active snapshot held by the session: - there is a running query - there is an open transaction with an open cursor - there is an open transaction with isolation level REPEATABLE READ or higher Yours, Laurenz Albe -- Cybertec | https://www.cybertec-postgresql.com
