| From: | Andreas Kretschmer <andreas(at)a-kretschmer(dot)de> |
|---|---|
| To: | pgsql-performance(at)postgresql(dot)org,"ldh(at)laurent-hasson(dot)com" <ldh(at)laurent-hasson(dot)com>,"pgsql-performance(at)postgresql(dot)org" <pgsql-performance(at)postgresql(dot)org> |
| Subject: | Re: Sudden drastic change in performance |
| Date: | 2017-06-15 15:14:14 |
| Message-ID: | 47399D01-6A87-489E-A398-AD94E8B89B14@a-kretschmer.de |
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| Lists: | pgsql-performance |
Am 15. Juni 2017 16:53:44 MESZ schrieb "ldh(at)laurent-hasson(dot)com" <ldh(at)laurent-hasson(dot)com>:
>Hello all,
>
>I have a query with many joins, something like:
>
>Select c1, c2, c3, sum(c5)
> From V1
> Join V2 on ...
> Left join V3 on ...
> Left join T4 on ...
> Join T5 on ...
> Join T6 on ...
> Left join T7 on ...
> Join T8 on ...
> Left join T9 on ...
>Where ...
>Group by c1, c2, c3
>
>
>Thank you,
>Laurent.
Please show us the explain analyse for the queries.
Regards, Andreas
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