Jeff Davis <pg...@j-davis.com> writes: > On Fri, 2010-03-19 at 01:59 +0530, Gokulakannan Somasundaram wrote: >> I believe it is very difficult to make visibility map update friendly >> without compromising durability. But such a functionality is very >> much wanted in PG still.
> Surely the VM is already update-friendly. If you update a tuple in a > page with the visibility bit set, the bit must be unset or you will get > wrong results. The VM is (a) not compressed and (b) not correctness-critical. Wrong bit values don't do any serious damage. regards, tom lane -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers