On Wed, 2010-03-17 at 14:09 -0700, Jeff Davis wrote:
> I've been thinking for a while that we could store the visibility
> information in a structure separate from the heap -- sort of like the
> visibility map, but per-tuple and authoritative rather than a per-page
> hint.
A lot of people have been thinking that for a while, but I've yet to see
a fully costed assessment of whether its worth doing. It might be.
It seems easier to focus on outcomes rather than specifics, then order
the possible solutions to those outcomes in cost-benefit sequence.
-- Simon Riggs www.2ndQuadrant.com