"Simon Riggs" <simon@2ndquadrant.com> writes:
> I would suggest that we tracked whether a block has had 0, 1 or 1+
> updates/deletes against it. When a block has 1+ it can then be
> worthwhile to VACUUM it and to place it onto the FSM. Two dead tuples is
> really the minimum space worth reclaiming on any block.
How do you arrive at that conclusion?
Counterexample: table in which all tuples exceed half a page.
regards, tom lane