From: | "Sven Kerkling" <kerkling(at)bds-online(dot)com> |
---|---|
To: | "'Merlin Moncure'" <mmoncure(at)gmail(dot)com> |
Cc: | "'postgres performance list'" <pgsql-performance(at)postgresql(dot)org> |
Subject: | Re: Performance problems with postgres and null Values? |
Date: | 2016-04-25 07:22:54 |
Message-ID: | 009a01d19ec3$4ba83060$e2f89120$@bds-online.com |
Views: | Raw Message | Whole Thread | Download mbox | Resend email |
Thread: | |
Lists: | pgsql-performance |
This one is quick, running in 20ms:
SELECT b.id, b.status
FROM export b, masterOld mb
WHERE mb.sperre IS NULL
AND mb.status IS NULL
AND b.id_firma = mb.id_firma
LIMIT 100;
http://explain.depesz.com/s/SCBo
This one ist the burden, running at least 100 seconds:
SELECT b.id, b.status
FROM export b, masterNew mb
WHERE mb.sperre IS NULL
AND mb.status IS NULL
AND b.id = mb.id
LIMIT 100;
http://explain.depesz.com/s/eAqG
There should be only slight differences between them.
Sven
-----Ursprüngliche Nachricht-----
Von: pgsql-performance-owner(at)postgresql(dot)org [mailto:pgsql-performance-owner(at)postgresql(dot)org] Im Auftrag von Merlin Moncure
Gesendet: Samstag, 23. April 2016 00:11
An: Sven Kerkling
Cc: postgres performance list
Betreff: Re: [PERFORM] Performance problems with postgres and null Values?
On Thu, Apr 21, 2016 at 4:49 AM, Sven Kerkling <kerkling(at)bds-online(dot)com> wrote:
> Can somebody help me with these performance Problem.
>
> What can I try to solve this?
can you explain what the problem actually is? Which query is running slow and how fast do you think it should run?
merlin
--
Sent via pgsql-performance mailing list (pgsql-performance(at)postgresql(dot)org)
To make changes to your subscription:
http://www.postgresql.org/mailpref/pgsql-performance
From | Date | Subject | |
---|---|---|---|
Next Message | Albe Laurenz | 2016-04-25 08:08:22 | Re: Performance problems with postgres and null Values? |
Previous Message | bricklen | 2016-04-24 20:14:25 | Re: Performant queries on table with many boolean columns |