"Francisco Reyes" <lists(at)stringsutils(dot)com> writes:
> So far in this data set almost every time bitmap scans are used the queries
> do worse, much worse. I had one extreme case where a sequential scan would
> finish in 20 minutes and the same query using bitmap scans would take over
> a day to finish.
That's fairly hard to believe. Care to offer some details?
regards, tom lane