Re: backend_xmin in pg_stat_replication

2018-10-01 Thread Torsten Förtsch
Thanks a lot! So, the correct calculation is like this: select application_name, txid_snapshot_xmin(txid_current_snapshot()), backend_xmin::TEXT::BIGINT, (txid_snapshot_xmin(txid_current_snapshot())-backend_xmin::TEXT::BIGINT)%(2^32)::BIGINT from pg_stat_replication; applicati

Re: backend_xmin in pg_stat_replication

2018-10-01 Thread Andres Freund
Hi, On 2018-10-01 12:20:26 +0200, Torsten Förtsch wrote: > if I understand it correctly, backend_xmin in pg_stat_replication is the > xmin that's reported back by hot_standby_feedback. Given there are no > long-running transactions on the replica, I presume that value should be > pretty close to t