Alvaro Herrera <[EMAIL PROTECTED]> writes:
> On Tue, Mar 15, 2005 at 06:51:19PM -0500, Tom Lane wrote:
>> I believe VACUUM already knows that xmin = xmax implies the tuple
>> is dead to everyone.

> Huh, that is too simplistic in a subtransactions' world, isn't it?

Well, it's still correct as a fast-path check.  There are extensions
you could imagine making ... but offhand I agree that it's not worth
the trouble.  Maybe in a few years when everyone and his sister is
using subtransactions constantly, we'll feel a need to optimize these

                        regards, tom lane

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