Hi All
I set up Postgres 11 stream replication env.Use keepalived to control VIP and a script to check Postgres status.
Usually. I could check the stream replication status by this view "pg_stat_replcation" on primary server.
Check this view "pg_stat_wal_receiver" on standby server.
Sometime the primary server abnormal or the network interrupt by unexpected issue.
Both of them no record "pg_stat_replcation", "pg_stat_wal_receiver" on that time.
I want to know the stream replication gap between primary and standby before standby promote.
If the primary and standby have long replay_lag. I don't want to standby server promote.
Is there any view or function which store the latest stream replication gap(replay_lag) between primary and standby ?
Or it there any workaround to know this stream replication gap(replay_lag) infomation ? Thanks for your help.
Jack.Xu
