On Thu, Mar 18, 2010 at 15:07, Jeff Davis <pgsql@j-davis.com> wrote:
> On Thu, 2010-03-18 at 16:50 -0400, Tom Lane wrote:
>> The VM is (a) not compressed and (b) not correctness-critical.
>> Wrong bit values don't do any serious damage.
>
> 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?
Isn't it only really used for VACUUM at this point?
