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Diving Into the Shared Pool - An In Depth Look at Tuning the Shared Pool (Part 1)

Oracle Tips by Mike Ault

Putting it All In Perspective

The command set to perform a flush on a once every 30 minute cycle when the pool reaches 95% full would be:

:X,'BEGIN dbms_revealnet.flush_it(95); END;',SYSDATE,'SYSDATE

(Always commit after assigning a job or the job will not be run and queued)

There is always a discussion as to whether this really does help performance so I set up a test on a production instance where on day 1 I did no automated flushing and on day 2 I instituted the automated flushing. Figure 13 shows the graphs of performance indicators, flush cycles and users.


For more information on this topic, I recommend Don Burleson's latest book "Oracle Tuning: The Definitive Reference". 

You can buy it direct from the publisher for 50%-off and get instant access to the code depot of Oracle tuning scripts:


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