| From: | Sergey Konoplev <sergey(dot)konoplev(at)postgresql-consulting(dot)com> |
|---|---|
| To: | David Kerr <dmk(at)mr-paradox(dot)net> |
| Cc: | Ali Pouya <alipouya2(at)gmail(dot)com>, pgsql-admin(at)postgresql(dot)org |
| Subject: | Re: Measurin the lag between a master and a replica |
| Date: | 2012-07-20 04:03:04 |
| Message-ID: | CAL_0b1s3Q-vEViErGOOeCZK=hCFyr9eXRqySH8H1cs4TXNRy3Q@mail.gmail.com |
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| Lists: | pgsql-admin |
On Fri, Jul 20, 2012 at 1:02 AM, David Kerr <dmk(at)mr-paradox(dot)net> wrote:
> I was looking into this last month and some nice folks on the list pointed me to this formula
> for calculating lag. (to be run on the slave) similar to what Sergey said.
>
> when pg_last_xlog_receive_location() = pg_last_xlog_replay_location()
> then 0
> else extract ('epoch' from now()-pg_last_xact_replay_timestamp()) end as log_delay;
If you have a connection problem this will not reflect the situation.
--
Sergey Konoplev
a database architect, software developer at PostgreSQL-Consulting.com
http://www.postgresql-consulting.com
Jabber: gray(dot)ru(at)gmail(dot)com Skype: gray-hemp Phone: +79160686204
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