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Re: Query performance issue

From: Sushant Sinha <sushant354(at)gmail(dot)com>
To: Jayadevan M <Jayadevan(dot)Maymala(at)ibsplc(dot)com>
Cc: PGSQL Performance <pgsql-performance(at)postgresql(dot)org>
Subject: Re: Query performance issue
Date: 2011-08-31 09:37:20
Message-ID: 1314783440.1793.0.camel@dragflick (view raw, whole thread or download thread mbox)
Lists: pgsql-performance
Where is the query? And also paste the \d to show the tables and


On Wed, 2011-08-31 at 14:30 +0530, Jayadevan M wrote:
> Hello all, 
> I have a query which takes about 20 minutes to execute and retrieves
> 2000-odd records. The explain for the query is pasted here 
> The same query, with similar data structures/indexes and data comes
> back in 50 seconds in Oracle. We just ported the product to PostgreSQL
> and are testing it. Any input on what to look for? 
> Possible relevant parameters are 
> shared_buffers = 4GB                     
> temp_buffers = 8MB                     
> work_mem = 96MB                       
> maintenance_work_mem = 1GB             
> effective_cache_size = 8GB             
> default_statistics_target = 50         
> It is a machine with 16 GB RAM. 
> Regards, 
> Jayadevan
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