Re: [GENERAL] I got bit by that darn GEQO setting again...

[David Helgason]

Mike Mascari <[EMAIL PROTECTED]> writes:
But just as a quick notice to those upgrading from 7.3 to 7.4 with 
fully
normalized databases requiring > 11 joins, the GEQO setting can be a
killer...
Uh ... dare I ask whether you think it's too high?  Or too low?
Just a data point: With a fresh 7.4 and

        geqo=on
        geqo_threshold=11
        geqo_generations=0
        geqo_effort=1
        geqo_pool_size=0
        geqo_selection_bias=2
a 12 table join was taking a whole second to plan until I manually 
connected the tables (now it's in the order of a few ms).

I figure geqo had kicked in at that point.



d.

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