On Jul 19, 2012, at 9:03 PM, Sergey Konoplev wrote:
> On Fri, Jul 20, 2012 at 1:02 AM, David Kerr <dmk@mr-paradox.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.
Good caveat! monitor the connection status separately as well!