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From: Heikki Linnakangas <heikki@enterprisedb.com>
To: Nimesh Satam <nimesh.zedo@gmail.com>
Cc: pgsql-performance@postgresql.org
Cc: nimesh@zedo.com
Subject: Re: Append Cost in query planners
Date: Mon, 29 Oct 2007 15:22:07 +0000
Message-ID: <4725FA9F.7050207@enterprisedb.com> (raw)
In-Reply-To: <965aa3ed0710290455i4c746b83j38c7c49d1aa4b726@mail.gmail.com>
References: <965aa3ed0710280822x4d1ffc9dh74f67740fdcff5cb@mail.gmail.com>
	<4724ACE7.4090401@enterprisedb.com>
	<965aa3ed0710280950p7b931873w213e78f2b170176a@mail.gmail.com>
	<4724D34C.1000606@enterprisedb.com>
	<965aa3ed0710290409w1d7680fke7858fd8667d664c@mail.gmail.com>
	<4725C695.6010704@enterprisedb.com>
	<965aa3ed0710290455i4c746b83j38c7c49d1aa4b726@mail.gmail.com>

Nimesh Satam wrote:
> Thanks for the information. join_collapse_limit = 1 is already set before
> sending the query plan.

I assume that was a typo, and you really set it to 10 or higher...

> Will a index scan on metrics.netkey help in improving the performance what
> other configuration parameters should we consider while opting for
> partition?

Whether it helps or not depends on many things, like the distribution of
the data, but it's worth trying. I'd try that first, before worrying
about config parameters.

-- 
  Heikki Linnakangas
  EnterpriseDB   http://www.enterprisedb.com



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