Re: pkey is not used on productive database

On Mon, Oct 03, 2011 at 02:48:10PM -0300, Soporte @ TEKSOL S.A. wrote:
> Hi,
>
>
>
> I need help to understand the issue on a productive database for a select
> that takes more time than expected.
>
>
>
> 1- On a development database I ran the query (select) and I can see on
> Explain Analyze pgAdmin use all the indexes and primary keys defined. Dev db
> has almost 10% of productive data.
>
> 2- On productive database the same query on Explain Analyze from
> pgAdmin shows a diferent planning, not using a pkey index and instead uses
> the progressive scan on a million of rows. I can see Primary key is defined
> for the table on pgAdmin.
>
>
>
> What could be the issue on a productive for not use the pkey index for the
> SELECT?

general answer:
http://www.depesz.com/index.php/2010/09/09/why-is-my-index-not-being-used/

but for more details, we'd need to see the query and \d of the table.

Best regards,

depesz

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