Re: SQL statement over 500% slower with 9.2 compared with 9.1

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On 08/28/2013 09:08 PM, Tom Lane wrote:
[..........]

>
> If you don't want to do any major rewriting, you could probably
> stick an OFFSET 0 into the outer EXISTS sub-select (and/or the
> inner one) to get something similar to the 9.1 plan.
>

Thank you for your help.

Using OFFSET 0 in

SELECT *
FROM FilmParticipation C
WHERE C.partType = 'cast'
AND C.filmId = D.filmId
AND C.personId = D.personId
OFFSET 0

give us a result similar to 9.1.

This SQL is used as an example in one of the database courses at the
University. I will send them this information and they can decide if
they want to rewrite the statement or use the OFFSET trick.

regards,
- --
Rafael Martinez Guerrero
Center for Information Technology
University of Oslo, Norway

PGP Public Key: http://folk.uio.no/rafael/
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