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Oracle Tips by Burleson 

AWR Settings: Changing Interval and Retention

This script makes it simpler to change the retention, but there are relatively few times when this should be done.  In general, the DBA should determine what frequency and retention periods make the most sense for the specific database and situation.  In some cases, the DBA may be content with hourly snapshots and seven days’ worth of history. 

To further implement the self-tuning database, it might be a good idea to vary the retention and frequency of the AWR snapshots based on database load or some criteria by which the DBA determines how busy the database is.  The frequencies could be shortened when there are problems and lengthened when the problems are all under control.

When troubleshooting a problem that happens less than once a week, DBAs may want to keep history around a bit longer.  If the problem is not readily apparent with the hourly frequency because the data about the problem is lumped in with the rest of the work going on over the whole hour, the DBA may want a more frequent snapshot until the issue is resolved.   Anytime these settings are changed, the DBA must be sure to revisit space allocation to make sure that the space will not run out so that data collections are not missed due to lack of space.


The above book excerpt is from:

Oracle Wait Event Tuning

High Performance with Wait Event Iinterface Analysis 

ISBN 0-9745993-7-9  

Stephen Andert 

http://www.rampant-books.com/book_2004_2_wait_tuning.htm

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