Re: cheaper snapshots

Hannu Krosing <hannu@2ndQuadrant.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