On Mon, 2010-03-22 at 16:48 -0400, Bruce Momjian wrote:
> I don't think we want to move to 64-bit xids becasue we would still need
> to do vacuum freeze to trim the clog. In fact we do vacuum freeze much
> more frequently than required for 32-bit xids for this very reason.
Good point. I think there are a lot of issues like this, which would
make storing the visibility information separate from the heap a huge
undertaking. Still worth thinking about, though.
Regards,Jeff Davis