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

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От soumitra bhandary
Тема Re: Null value returned by function pg_last_wal_receive_lsn()inLogical Replication
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Msg-id MA1PR0101MB168717FC2FD46C905203B04FE0FD0@MA1PR0101MB1687.INDPRD01.PROD.OUTLOOK.COM
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Ответ на Re: Null value returned by function pg_last_wal_receive_lsn()inLogical Replication  (Mark Kirkwood <mark.kirkwood@catalyst.net.nz>)
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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.kirkwood@catalyst.net.nz>
Sent: Monday, October 15, 2018 7:52 AM
To: pgsql-admin@lists.postgresql.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
>


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