"Kevin Grittner" <Kevin.Grittner@wicourts.gov> writes:
> Andres Freund <andres@anarazel.de> wrote:
>
>> long plan times (minutes and up)
>
> Wow. I thought I had some pretty complex queries, including some
> which join using several views, each of which has several joins; but
> I've never gone to multiple seconds on plan time (much less multiple
> minutes!) without very high statistics targets and many indexes on the
> tables. Any rough estimates on those?
My money's still on very large statistics targets. If you have a lot of
columns and 1,000-element arrays for each column that can get big pretty
quickly.
But that doesn't explain the bitmap ops being important. Hm. Actually having a
lot of columns and then joining a lot of tables could mean having fairly large
bitmapsets.
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