| From: | Johan Fredriksson <eskil(at)kth(dot)se> |
|---|---|
| To: | pgsql-performance(at)postgresql(dot)org |
| Subject: | Re: Performance problems with 9.2.15 |
| Date: | 2016-05-27 14:13:09 |
| Message-ID: | 574855F5.8070603@kth.se |
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| Lists: | pgsql-performance |
> 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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