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Re: Disk Access Question

From: Robert Treat <xzilla(at)users(dot)sourceforge(dot)net>
To: pgsql-admin(at)postgresql(dot)org, revoohc(at)gmail(dot)com
Subject: Re: Disk Access Question
Date: 2005-09-21 11:48:31
Message-ID: (view raw or whole thread)
Lists: pgsql-admin
On Tuesday 20 September 2005 13:55, Chris Hoover wrote:
> I have a question on disk access.
> How often is PostgreSQL accessing/touching the files that are on the hard
> drive?
> What I'm trying to ask is, is PostgreSQL constantly updating access
> timestamps or something like that on the database files even if they are
> not being queried? This questions comes from an Oracle background where
> Oracle was updating the individual files every 3 seconds if I am
> remembering correctly.
> I am trying to figure out besides the queries, what sort of accessing is
> PostgreSQL doing to my drives so we can try and resolve some i/o issues.

AFAIK unless your actually doing something,it wont access your data files at 
all.  Note that something is pretty wide here, insert/update/vacuum/analyze 
and even select will cause file access but otherwise it wont. 

Robert Treat
Build A Brighter Lamp :: Linux Apache {middleware} PostgreSQL

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