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Re: Query completed in < 1s in PG 9.1 and ~ 700s in PG 9.2 - Mailing list pgsql-performance

From Tom Lane
Subject Re: Query completed in < 1s in PG 9.1 and ~ 700s in PG 9.2
Date
Msg-id 15781.1352223387@sss.pgh.pa.us
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In response to Re: Query completed in < 1s in PG 9.1 and ~ 700s in PG 9.2  (Merlin Moncure <mmoncure@gmail.com>)
Responses Re: Query completed in < 1s in PG 9.1 and ~ 700s in PG 9.2
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Merlin Moncure <mmoncure@gmail.com> writes:
> Problem could also be no statistics (run ANALYZE to test) or some
> other configuration problem (like index locale), or a bona fide
> regression.

I'm wondering about join_collapse_limit in particular --- if that wasn't
cranked up in the 9.1 installation, it would be pure luck if you got a
good query plan for an example like this.  Maybe that and/or other
parameter settings didn't get transposed to the 9.2 installation.

            regards, tom lane

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