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Re: cheaper snapshots

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: Hannu Krosing <hannu(at)2ndQuadrant(dot)com>
Cc: Robert Haas <robertmhaas(at)gmail(dot)com>, pgsql-hackers(at)postgresql(dot)org
Subject: Re: cheaper snapshots
Date: 2011-07-28 19:42:11
Message-ID: 3789.1311882131@sss.pgh.pa.us (view raw or flat)
Thread:
Lists: pgsql-hackers
Hannu Krosing <hannu(at)2ndQuadrant(dot)com> writes:
> On Thu, 2011-07-28 at 14:27 -0400, Robert Haas wrote:
>> We can't make either transaction visible without making
>> both visible, and we certainly can't acknowledge the second
>> transaction to the client until we've made it visible.  I'm not going
>> to say that's so horrible we shouldn't even consider it, but it
>> doesn't seem great, either.

> Maybe this is why other databases don't offer per backend async commit ?

Yeah, I've always thought that feature wasn't as simple as it appeared.
It got in only because it was claimed to be cost-free, and it's now
obvious that it isn't.

			regards, tom lane

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