Re: Null value returned by function pg_last_wal_receive_lsn() inLogical Replication

Hi Pavan ,

Yes as Mark explained , in logical replication no db server is in recovery mode and replication is happening through Replication slot . So no log shipping is involved here .

Hope this clarified your queries .

Thanks ,
Soumitra
________________________________
From: Mark Kirkwood <mark(dot)kirkwood(at)catalyst(dot)net(dot)nz>
Sent: Monday, October 15, 2018 7:52 AM
To: pgsql-admin(at)lists(dot)postgresql(dot)org
Subject: Re: Null value returned by function pg_last_wal_receive_lsn() inLogical Replication

I think those functions really only make sense for physical replication.

Looking at the docs e.g:
https://www.postgresql.org/docs/10/static/logical-replication-monitoring.html
they appear to *suggest* that monitoring should be similar...some
clarification there is probably in order!

However they also say to use the pg_stat_subsubscription view to monitor
your logical rep, e.g: here's what my pgbench dataset subscription looks
like:

bench=# SELECT * FROM pg_stat_subscription;
subid | subname | pid | relid | received_lsn |
last_msg_send_time | last_msg_receipt_time |
latest_end_lsn | latest_end_time
-------+---------+------+-------+--------------+-------------------------------+-------------------------------+----------------+-------------------------------
16409 | pgbench | 8840 | | 0/51EB3A20 | 2018-10-15
15:16:38.501061+13 | 2018-10-15 15:16:38.501103+13 | 0/51EB3A20 |
2018-10-15 15:16:38.501061+13
(1 row)

Cheers

Mark

On 11/10/18 02:43, pavan95 wrote:
> Hi Soumitra,
>
> Could you please explain the reason behind taking the
> pg_current_xlog_insert_location() & restart_lsn?
>
>
> Regards,
> Pavan
>
>
>
> --
> Sent from: http://www.postgresql-archive.org/PostgreSQL-admin-f2076596.html
>