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
>