Re: Keepalive for max_standby_delay

On 03/07/10 18:32, Tom Lane wrote:
> Heikki Linnakangas<heikki.linnakangas@enterprisedb.com>  writes:
>> It would seem logical to use the same logic for archive recovery as we
>> do for streaming replication, and only set XLogReceiptTime when you have
>> to wait for a WAL segment to arrive into the archive, ie. when
>> restore_command fails.
>
> That would not do what you want at all in the case where you're
> recovering from archive --- XLogReceiptTime would never advance
> at all for the duration of the recovery.

Do you mean when using something like pg_standby, which does the waiting 
itself?

> It might be useful if you knew that it was a standby-with-log-shipping
> situation, but we have no way to tell the difference.

With pg_standby etc. you use standby_mode=off. Same with traditional 
archive recovery. In standby mode, it's on.

--   Heikki Linnakangas  EnterpriseDB   http://www.enterprisedb.com