From: Tom Lane <tgl@sss.pgh.pa.us>
To: s.borse@direction.biz, "Julius Tuskenis" <julius@nsoft.lt>
To: pgsql-admin@postgresql.org
Subject: Re: query optimization
Date: Thu, 10 Jul 2008 12:21:44 -0400
Message-ID: <9895.1215706904@sss.pgh.pa.us> (raw)
In-Reply-To: <dcc563d10807100847y1d6f5f5ei4e1e380ecc4c3c24@mail.gmail.com>
References: <1215680493.2113.26.camel@dss-052.dsslp.com>
<4875D589.1030107@nsoft.lt>
<1215683144.2113.35.camel@dss-052.dsslp.com>
<dcc563d10807100847y1d6f5f5ei4e1e380ecc4c3c24@mail.gmail.com>
On Thu, Jul 10, 2008 at 3:45 AM, Suresh Borse <s.borse@direction.biz> wrote:
>> The view executes very faster for the first time.
>> When I execute the view again and again suddenly it gets slow or it gets
>> hang.
>> The view contains multi-table joins.
Uh, how many joins?
If you're exceeding geqo_threshold then you would get plans with a
random component to them. You might want to increase the threshold,
although planning time would probably go up.
Also, what PG version is this?
regards, tom lane
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To: pgsql-admin@postgresql.org
Cc: tgl@sss.pgh.pa.us, julius@nsoft.lt
Subject: Re: query optimization
In-Reply-To: <9895.1215706904@sss.pgh.pa.us>
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