"Ozer, Pam" <pozer@automotive.com> writes:
> Unfortunately I have not received a response on this question. Is more
> information needed? Does anyone have any ideas why the estimates may be
> bad? Or what I might be able to do to speed this up?
The most likely explanation for the bad rowcount estimates is that there
is correlation between the regionid/countyid/cityid columns, only the
planner doesn't know it. Can you reformulate that data representation
at all, or at least avoid depending on it as a join key?
regards, tom lane