How to change query planner configuration paramerters

From: Melaka Gunasekara <donmelaka(at)gmail(dot)com>
To: pgsql-admin(at)postgresql(dot)org
Subject: How to change query planner configuration paramerters
Date: 2011-09-18 09:25:46
Message-ID: CAM4Dy=120OKxqjsXV1rRK1eXH=uoDes_k5SvrUdR6xESUXWAww@mail.gmail.com
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Hi all,

I came across
http://www.postgresql.org/docs/8.4/static/runtime-config-query.html which
describes
how to change query planner configuration paramerters.

I need to know how I can change these parameters.
For example if I need to turn off enable_hashjoin, how can I do that?

Best Regards,
Melaka

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