> Mike Mascari <mascarm@mascari.com> 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.