Re: Slow query (wrong index used maybe)

Stelian Iancu <stelian@iancu.ch> writes:
> I have Postrgres 9.3 running on a Linux machine with 32GB RAM. I have a
> fairly large database (some tables with approx. 1 mil. records) and I
> have the following query:
> [ 13-way join joined to a 3-way join ]

Think you'll need to raise join_collapse_limit and from_collapse_limit
to get the best plan here.  The planning time might hurt, though.

TBH that schema looks designed for inefficiency; you'd be better off
rethinking the design rather than hoping the planner is smart enough
to save you from it.

            regards, tom lane