Gianni Ciolli <gianni(dot)ciolli(at)2ndquadrant(dot)it> writes:
> It seems there is a typo here:
> http://www.postgresql.org/docs/devel/static/routine-vacuuming.html#VACUUM-FOR-WRAPAROUND
> where we say that we compare XIDs using arithmetic modulo 2^31, which
> should instead be 2^32 (as it is with uint32, e.g. xid_age).
[ thinks about that for awhile... ] Yeah, I think you're right.
Patch pushed, thanks!
regards, tom lane