I'm using Guy Harrison's script that shows the percent of waits for WRITES
to rollback segmants, and also the percent of waits for READS from rollback
segments.  If there are too many waits he suggests adding additional
rollback segments.

My problem is the book says waits become significant if they happen more
than 0.5% of the time, but in the script he's got a comment that prints out
saying add more rollback segments if waits for READS happen more than 5% of
the time.

So,
(1) Should I use 0.5% or 5% as a guideline?
(2) Should I focus more on waits for WRITES or READS, or both?

Thanks.

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Author: Greg Moore
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