Re: Query > 1000× slowdown after adding datetime comparison

On 08/31/2015 06:09 PM, twoflower wrote:
> I have the following three tables:
...
> This is the query plan:
>
> 
>
> 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