On Thu, 14 May 2009, Ow Mun Heng wrote:
Shouldn't BITMAP indexes come into play?
Does having one index w/ 3 parameters being better than 3 index w/ 3
different parameters be better for BITMAP index seeks?
I'll let someone correct me if I'm wrong, but using a single index that
exactly covers your search is always going to be better than munging
together results from several indexes, even if the planner decides to turn
it into a bitmap index scan (which will be more likely in PG8.4 with
effective_concurrency set).
Matthew
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