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Oracle Tips by Burleson 

Sample run of the addmrpt report 

The header of this report contains information on the period of time when this report was run, as well as information on the database and instance for which it was run.  The body of the report is presented as a series of findings.  Each finding is presented with an overall bottleneck report, and one or more recommendations on how to ease that bottleneck.  Each recommendation displays an estimated benefit available by following the said recommendation. 

The first finding is that the CPU is the biggest bottleneck.  The first recommendation is to add more CPUs or add instances to support this load.  In this case, adding more instances would not resolve the problem since the average load, as shown by the header information, is only 1.2 sessions.  Adding CPUs would only enhance performance if the busy session was able to take advantage of the parallelism offered by an increased CPU count.  If this is a batch job, there is likely some serious redesign that will be required to support this approach since simply putting more CPUs in a machine will not necessarily improve performance for a given user.

The above book excerpt is from:

Oracle Wait Event Tuning

High Performance with Wait Event Iinterface Analysis 

ISBN 0-9745993-7-9  

Stephen Andert

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