Re: postgres performance tunning

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(at)2ndQuadrant(dot)com Baltimore, MD
PostgreSQL Training, Services and Support www.2ndQuadrant.us
"PostgreSQL 9.0 High Performance": http://www.2ndQuadrant.com/books