Re: Logical replication monitoring

On 10/08/2018 13:05, AYahorau(at)ibagroup(dot)eu wrote:
> Hello PostgreSQL Community!
>
> I configured logical replication for PostgreSQL 10.4 on 2 machines, set wal_level to logical, created a publication on master node and created a subscription on standby node according to the
> PostgreSQL documentation.
> Could you please suggest an approach for replication state monitoring.
>
> According to my experience the monitoring of *pg_stat_subscription *and *pg_publication, pg_replication_slots *unfortunately is not enough for this aim. Moreover standby database does not prohibit
> write operations by default and it can lead to some inconsistency between these databases.
>
> For example a chain of queries as
> *SELECT pg_is_is_recovery()*,
> *SELECT * FROM pg_stat_replication* and
> *SELECT * FROM pg_stat_wal_receiver*
> provide insight into replication state for hot_standby replication.
>
> So is there a reliable way of replication state monitoring for logical replication?
tail_n_mail and look for relevant errors (logical, logical replication worker ... exited with ..., ERROR)
>
>
> Best regards,
> Andrei Yahorau

--
Achilleas Mantzios
IT DEV Lead
IT DEPT
Dynacom Tankers Mgmt