From: | Claudio Freire <klaussfreire(at)gmail(dot)com> |
---|---|
To: | Heikki Linnakangas <hlinnakangas(at)vmware(dot)com> |
Cc: | Andres Freund <andres(at)2ndquadrant(dot)com>, PostgreSQL-Dev <pgsql-hackers(at)postgresql(dot)org> |
Subject: | Re: Hot Standby Feedback should default to on in 9.3+ |
Date: | 2012-11-30 20:49:51 |
Message-ID: | CAGTBQpYyO3RjXmwsY21FhVpG-czrttoaU7STUJKMjWArYrxyGQ@mail.gmail.com |
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On Fri, Nov 30, 2012 at 5:46 PM, Heikki Linnakangas
<hlinnakangas(at)vmware(dot)com> wrote:
>
> Think of someone setting up a test server, by setting it up as a standby
> from the master. Now, when someone holds a transaction open in the test
> server, you get bloat in the master. Or if you set up a standby for
> reporting purposes - a very common use case - you would not expect a long
> running ad-hoc query in the standby to bloat the master. That's precisely
> why you set up such a standby in the first place.
Without hot standby feedback, reporting queries are impossible. I've
experienced it. Cancellations make it impossible to finish any
decently complex reporting query.
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