Heikki Linnakangas <[EMAIL PROTECTED]> writes:
> It seems to me that we could easily reclaim a bit more dead tuples in a 
> vacuum by recalculating the OldestXmin every now and then.

Doesn't this break relfrozenxid maintenance?  In any case I'd like to
see some evidence of significant real-world benefit before adding such
a conceptual wart ...

The procarray.c change scares me as well; I'm pretty sure the original
coding was intentional.

                        regards, tom lane

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