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Subject: Re: Capacity planning.
From: Brad Nicholson <bnichols@ca.afilias.info>
To: David Harel <hareldvd@gmail.com>
Cc: postgresql <pgsql-sql@postgresql.org>
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References: <4BAB6D03.7010905@gmail.com>
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Date: Thu, 01 Apr 2010 09:12:51 -0400
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On Thu, 2010-03-25 at 16:02 +0200, David Harel wrote:

> Also where can I find docs that can help me make a capacity plan for
> max 100,000 clients making around 200 transactions a day each.

You will need a whole lot more information than that in order to do
capacity planning.

Here are a few questions to get you started

-What is the expected percentage of read vs write transactions.  
-Are they small OLTP style writes, or larger ones?
-Do you expect these transactions to be equally distributed over the
day, or do you expect bursts?
-Are you going to be dealing with highly concurrent access, or is it
distributed?
-what is the expected cache hit ratio?
-what is the expected data size?  What is the expected growth rate?

-- 
Brad Nicholson  416-673-4106
Database Administrator, Afilias Canada Corp.