On Fri, Nov 22, 2019 at 01:20:59PM +0000, Zwettler Markus (OIZ) wrote: > I came up with the following query which should return any apply lag in > seconds. > > select coalesce(replay_delay, 0) replication_delay_in_sec > from ( > select datname, > ( > select case > when received_lsn = latest_end_lsn then 0 > else extract(epoch > from now() - latest_end_time) > end > from pg_stat_wal_receiver > ) replay_delay > from pg_database > where datname = current_database() > ) xview; > > > I would expect delays >0 in case SYNC or ASYNC replication is > somehow behind. We will do a warning at 120 secs and critical at 300 > secs.
pg_stat_wal_receiver is available only on the receiver, aka the standby so it would not really be helpful on a primary. On top of that streaming replication is system-wide, so there is no actual point to look at databases either. > Would this do the job or am I missing something here? Here is a suggestion for Nagios: hot_standby_delay, as told in https://github.com/bucardo/check_postgres/blob/master/check_postgres.pl -- Michael
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