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Re: Large database help

From: xbdelacour(at)yahoo(dot)com
To: Ragnar Kjørstad <postgres(at)ragnark(dot)vestdata(dot)no>
Cc: pgsql-admin(at)postgresql(dot)org
Subject: Re: Large database help
Date: 2001-04-24 00:15:05
Message-ID: 5.0.2.1.0.20010423200655.019bb6c0@pop.mail.yahoo.com (view raw or flat)
Thread:
Lists: pgsql-admin
ANote: some disk activety should be expected. Maybe postgresql updates
>the log? Or at the very least it will update the atime timestamps for
>the files everytime they're read. This shouldn't cause enough disk
>activity to become a performance-problem, but if I remember your initial
>post correctly, you indicated that one processor was fully saturated.
>
>Maybe the problem is in fact related to locking and smp, and not related
>to shared-memory and disk activity?

Then, please correct me if I'm wrong: I should be able to test your 
hypothesis by creating a small DB (of say 2MB) and setting up at least a 
dozen backends to tag it. If I get the same symptoms w/ respect to disk 
activity/performance then we could say that the problem is not related to 
shared memory/the amount of data/swapping.

What log files are output from postgres? I was under the impression that 
postmaster's stdout/stderr were the only output. I've been postmaster 
xyz >& log.txt'ing it. I'll check into this.

Thanks a lot for your help :-)

-Xavier


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