Re: How can I make PostgreSQL to select another quey plan?

From: Sean Davis <sdavis2(at)mail(dot)nih(dot)gov>
To: Yangyang <yangyangbm(at)gmail(dot)com>
Cc: "pgsql-novice(at)postgresql(dot)org" <pgsql-novice(at)postgresql(dot)org>
Subject: Re: How can I make PostgreSQL to select another quey plan?
Date: 2011-11-30 15:57:43
Message-ID: CANeAVB=d_z6mTrsMkPu+NttccZS_MgH9+AFSuxy61ru7fZy=PA@mail.gmail.com
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On Wed, Nov 30, 2011 at 10:51 AM, Yangyang <yangyangbm(at)gmail(dot)com> wrote:

> HI, dear all
> I'm trying to force the database to select another query plan for a
> query, rather than the optimal one.
> I changed query tuning related parameters, but the query plan stays
> the same. Although the costs for nodes changed correspondingly,
> What parameters can I modify to force the DB to select another plan?
> Any hints will be helpful.
>

What is the database structure, query, and plan? What do you want to have
changed?

Sean

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