Heikki Linnakangas <heikki(at)enterprisedb(dot)com> 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