Message-ID: <4D0B6393.8010400@2ndquadrant.com>
Date: Fri, 17 Dec 2010 08:20:19 -0500
From: Greg Smith <greg@2ndquadrant.com>
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To: selvi88 <selvi.dct@gmail.com>
CC: pgsql-performance@postgresql.org
Subject: Re: postgres performance tunning
References: <1292502787617-3307846.post@n5.nabble.com>
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selvi88 wrote:
>         I have a requirement for running more that 15000 queries per second.
> Can you please tell what all are the postgres parameters needs to be changed
> to achieve this. 
>         Already I have 17GB RAM and dual core processor and this machine is
> dedicated for database operation. 
>   

You can find a parameter tuning guide at 
http://wiki.postgresql.org/wiki/Tuning_Your_PostgreSQL_Server that may 
help you out.

You are unlikely to hit 15K queries/second with a dual core processor.  
When I run really trivial queries using the pgbench program to simulate 
database activity, that normally gives about 7K queries/second/core.  My 
dual-core laptop will do 13K/second for example.  And real-world queries 
tend to be a bit more intensive than that.  I would normally expect that 
a quad-core system would be needed to reach 15K even with trivial 
queries; my quad-core server at home will do 28K queries/second running 
pgbench.  If your individual cores are really fast, you might just make it.

-- 
Greg Smith   2ndQuadrant US    greg@2ndQuadrant.com   Baltimore, MD
PostgreSQL Training, Services and Support        www.2ndQuadrant.us
"PostgreSQL 9.0 High Performance": http://www.2ndQuadrant.com/books