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Re: Automagic tuning

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: josh(at)agliodbs(dot)com
Cc: Markus Schaber <schabios(at)logi-track(dot)com>,Christopher Kings-Lynne <chriskl(at)familyhealth(dot)com(dot)au>,PostgreSQL Performance List <pgsql-performance(at)postgresql(dot)org>
Subject: Re: Automagic tuning
Date: 2005-01-31 20:26:12
Message-ID: 3900.1107203172@sss.pgh.pa.us (view raw or flat)
Thread:
Lists: pgsql-performance
Josh Berkus <josh(at)agliodbs(dot)com> writes:
>> I would like something that really measures values like random_page_cost
>> or cpu_tuple_cost that are hardware dependent.
>> 
>> I assume such thing does not exist?

> Nope.  You gotta whip out your calculator and run some queries.

Preferably a whole lot of queries.  All the measurement techniques I can
think of are going to have a great deal of noise, so you shouldn't
twiddle these cost settings based on just a few examples.

			regards, tom lane

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