From: | John Felix <johnfelix(at)zeelandnet(dot)nl> |
---|---|
To: | Mariel Cherkassky <mariel(dot)cherkassky(at)gmail(dot)com>, Jeff Janes <jeff(dot)janes(at)gmail(dot)com> |
Cc: | Andrew Zakharov <Andrew898(at)mail(dot)ru>, pgsql-performance(at)lists(dot)postgresql(dot)org |
Subject: | Re: performance degredation after upgrade from 9.6 to 12 |
Date: | 2019-11-24 20:00:48 |
Message-ID: | 607ee392-d7e8-4da4-6a8a-61d3256c213a@zeelandnet.nl |
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Lists: | pgsql-admin pgsql-performance |
Op 24-11-2019 om 19:05 schreef Mariel Cherkassky:
> Hey Jeff,
> This example was only used to show that pg96 had better perfomance
> than pg12 in a very simple case.
> In all the tests that I run most of the queries took less time on
> 9.6`s version. I dont know why, but as you can see after
> disabling the parameter the simple test that I did showed different
> results. I intend to test this theory tomorrow. I'm going to disable
> the parameter and run the same application flows that I have on both
> machines (9.6 vs 12 with zero value for the param).
>
> I didnt send this mail after doing just one simple test, I have more
> than 100 queries that work better on 9.6 . If u have any explanation I
> will be happy to hear.
> I'll update tomorrow once I'll have the results..
>
I've had the same experience with parallel query. By default parallel
query is disabled in 9.6. When we upgraded from 9.6 to 10 is was
significant slower till I disabled parallel query.
We have a very small database (40 tables and all together max 4GB) and
we have no long running queries (the largest queries run max 2 to 3
seconds). That's when parallel query gives a performance degrade in my
opinion.
Best regards,
John Felix
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