Jack,
TOP adds %wio and %idle together.
Use 'sar -u' instead.
Jared
Jack Silvey <[EMAIL PROTECTED]>
Sent by: [EMAIL PROTECTED]
07/23/2002 08:58 AM
Please respond to ORACLE-L
To: Multiple recipients of list ORACLE-L <[EMAIL PROTECTED]>
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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:
1) is top a valid measure of IO wait?
2) Is a high io wait an issue to be concerned about?
3) how else can it be accurately measured?
4) How can I link IO wait to what is happening inside
the database?
Thanks,
Jack
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