=?iso-8859-1?q?Rolf=20=D8stvik?= <rolfostvik(at)yahoo(dot)no> writes:
> If you (Tom) still want me to do the following steps
> then please tell me.
Please --- I'm still curious why the estimated cost changed so much from
7.4 to 8.2. I can believe a marginal change in cost leading to a plan
switch, but comparing the total-cost numbers shows that 8.2 must think
that indexscan is a whole lot more expensive than 7.4 did, which seems
odd. For the most part 8.2 ought to think nestloop-with-inner-indexscan
is cheaper than 7.4 did, because we now account for caching effects across
repeated iterations of the inner scan.
regards, tom lane