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Easy Oracle Automation
Chapter 4 -
Automatic Workload Repository and Automatic Database Diagnostic Monitor

Exception Reporting with the AWR

This will query the dba_hist_sysstat view to display all values
that exceed the value specified in
the "where" clause of the query.

Enter Statistic Name:  physical writes
Enter Statistics Threshold value:  200000

SNAP_TIME                  VALUE
------------------- ------------
2004-02-21 08:00         200,395
2004-02-27 08:00         342,231
2004-02-29 08:00         476,386
2004-03-01 08:00         277,282
2004-03-02 08:00         252,396
2004-03-04 09:00         203,407

The listing above indicates a repeating trend, where physical writes seem to be high at 8:00 AM on certain days.  This powerful script permits quick extraction of exception conditions from any instance-wide Oracle metric to review over time.  A more powerful exception report will be examined next that compares system-wide values to individual snapshots.

The above text is an excerpt from:

Easy Oracle Automation
Oracle10g Automatic Storage, Memory and Diagnostic Features

ISBN 0-9745993-6-0

by Dr. Arun Kumar R.

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