Re: Logical Replication Delay on Remote Server

Hi Team,

adding one more point here,

5. Pg_stat_replication_slot total_txn count reduces when lag occurs .Does
decoding stop in case of logical replication delay?

On Tue, 23 Apr 2024 at 22:55, Ramakrishna m <ram(dot)pgdb(at)gmail(dot)com> wrote:

> Hi Team,
>
> I am facing replication lag in postgres16 at times,not able to find the
> reason.
>
> Please find the configuration:
> 1) Two replication slots for two servers (1 is the same data center,
> another remote)
> 2) weekly once/twice facing lag(around 2GB for 1k TPS environment) in the
> remote replication slot and another same data center server slot with 0
> lag.
>
> My observation:
>
> 1) Noticed pg_stat_replication_slot total_txn reduced from 1k to 5 or 6
> but other slot is same with 1k TPS
> 2)And noticed lag for remote slot but fine with same data center
> 3) Most importantly I have plenty of Bandwidth available in n/w ,2GB is
> still freely available out of 4GB network.
> 4)No IO issues on servers
> I am not able to prove if this is due to Network .Can you help me how to
> proceed on this?
> At Least how the logical decoding total_txn is counting the view
> pg_stat_replication_slot?
>
> --
> Thanks & Regards,
> Ram.
>

--
Thanks & Regards,
Ram.