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help / color / mirror / Atom feedFrom: Johan Fredriksson <[email protected]>
To: [email protected]
Subject: Re: Performance problems with 9.2.15
Date: Fri, 27 May 2016 16:13:09 +0200
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> The rowcount estimates from 9.2 seem greatly different from the 8.4 plan.
> Did you remember to ANALYZE all the tables after migrating? Maybe there
> were some table-specific statistics targets that you forgot to transfer
> over?
No, I did not. Honestly I though everything would be transfered with a
dump/restore procedure. Unfortunatly running ANALYZE VERBOSE on all
involved tables did not really improve anything.
> In any case, the 9.2 plan looks like garbage-in-garbage-out to
> me :-( ... without estimates at least a little closer to reality, the
> planner is unlikely to do anything very sane.
>
> (BTW, I wonder why you are moving only to 9.2 and not something more
> recent.)
Well, 9.2.15 is what comes bundled with RHEL 7, so I decided to go with
that to avoid dependency issues. But I could install a more fresh
version from scratch if that would solve my problem.
/ Eskil
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