Re: Proposal : For Auto-Prewarm.

From: Amit Kapila <amit(dot)kapila16(at)gmail(dot)com>
To: Peter Eisentraut <peter(dot)eisentraut(at)2ndquadrant(dot)com>
Cc: Mithun Cy <mithun(dot)cy(at)enterprisedb(dot)com>, Jim Nasby <Jim(dot)Nasby(at)bluetreble(dot)com>, pgsql-hackers <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: Proposal : For Auto-Prewarm.
Date: 2017-01-27 02:44:21
Message-ID: CAA4eK1LemrNuu6LpT4xMTUE5Dk+NDv4ETgcpXaSVT81y4AO2OQ@mail.gmail.com
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On Thu, Jan 26, 2017 at 8:45 PM, Peter Eisentraut
<peter(dot)eisentraut(at)2ndquadrant(dot)com> wrote:
> On 1/24/17 3:26 AM, Mithun Cy wrote:
>> In my code by default, we only dump at shutdown time. If we want to
>> dump at regular interval then we need to set the GUC
>> pg_autoprewarm.buff_dump_interval to > 0.
>
> Just a thought with an additional use case: If I want to set up a
> standby for offloading queries, could I take the dump file from the
> primary or another existing standby, copy it to the new standby, and
> have it be warmed up to the state of the other instance from that?
>
> In my experience, that kind of use is just as interesting as preserving
> the buffers across a restart.
>

An interesting use case. I am not sure if somebody has tried that way
but it appears to me that the current proposed patch should work for
this use case.

--
With Regards,
Amit Kapila.
EnterpriseDB: http://www.enterprisedb.com

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