Re: count(*) performance

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"Matthew T. O'Connor" <matthew@xxxxxxxx> writes:
> It is fairly easy to implement, however it has been discussed before and 
> decided that it wasn't necessary.  What the system cares about is how 
> long it's been since the last vacuum in terms of XIDs not time.

I think Alvaro is intending to do the latter (store per-table vacuum xid
info) for 8.2.

			regards, tom lane


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