Oracle-L: Re: IO wait

From: <Jared.Still_at_radisys.com>
Date: Wed, 24 Jul 2002 11:22:42 -0800
Message-ID: <F001.004A1517.20020724112242@fatcity.com>

Jack,

TOP adds %wio and %idle together.

Use 'sar -u' instead.

Jared

Jack Silvey <jack_silvey_at_yahoo.com>
Sent by: root_at_fatcity.com
07/23/2002 08:58 AM
Please respond to ORACLE-L

        To:     Multiple recipients of list ORACLE-L <ORACLE-L_at_fatcity.com>
        cc: 
        Subject:        IO wait

All,

We are tuning a new vital process on our data warehouse, and it is IO intensive - lots of parallel direct reads and writes. During our testing we are driving IO wait to ~60% (per top).

questions:

is top a valid measure of IO wait?
Is a high io wait an issue to be concerned about?
how else can it be accurately measured?
How can I link IO wait to what is happening inside the database?

Thanks,

Jack

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Author: Jack Silvey
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