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Re: Query > 1000× slowdown after adding datetime comparison - Mailing list pgsql-performance

From Tomas Vondra
Subject Re: Query > 1000× slowdown after adding datetime comparison
Date
Msg-id 55E47E97.1090202@2ndquadrant.com
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In response to Query > 1000× slowdown after adding datetime comparison  (twoflower <standa.kurik@gmail.com>)
Responses Re: Query > 1000× slowdown after adding datetime comparison  (twoflower <standa.kurik@gmail.com>)
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On 08/31/2015 06:09 PM, twoflower wrote:
> I have the following three tables:
...
> This is the query plan:
>
> <http://postgresql.nabble.com/file/n5864045/qp1.png>
>
> If I remove the WHERE condition, it returns immediately.
>
> Am I doing something obviously wrong?

Please share explain plans for both the slow and the fast query. That
makes it easier to spot the difference, and possibly identify the cause.

Also, what PostgreSQL version is this, and what are "basic" config
parameters (shared buffers, work mem)?

regards

--
Tomas Vondra                  http://www.2ndQuadrant.com
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services

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