On Thu, 2010-03-18 at 17:17 -0400, Tom Lane wrote: > > The VM cause wrong results if a bit is set that's not supposed to be -- > > right? Am I missing something? How does a seq scan skip visibility > > checks and still produce right results, if it doesn't rely on the bit? > > It doesn't. The only thing we currently rely on the VM for is deciding > whether a page needs vacuuming
Oh, my mistake. I misremembered the discussion and I thought the seq scan optimization made it in. > In order to do things like not visiting a page during scans, we'll have > to solve the reliability issues. Yeah, and also for the index-only scans. Regards, Jeff Davis -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers