Re: Major performance problem after upgrade from 8.3 to 8.4

From: Marc Antonio <marc(dot)queiroz(at)gmail(dot)com>
To: pgsql-performance(at)postgresql(dot)org
Subject: Re: Major performance problem after upgrade from 8.3 to 8.4
Date: 2011-01-05 20:06:41
Message-ID: 1294258001690-3329435.post@n5.nabble.com
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Hi,

I had a similar problem with many left join, reading about planning
optimization i tried to edit postgresql.conf and uncommented the line
join_collapse_limit = 8 and set it to 1, disables collapsing of explicit .
My query its taking 2000s in 8.4 and the same query 2ms in 8.3. Now its
working fast in 8.4.

Best regards,

Marc
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