Beginning Oracle Database 11g Administration From Novice to Professional

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CHAPTER 10 MONITORING
The view keeps track of hundreds of different aspects of the database workload,
such as logons, executions, commits, logical reads, physical reads, redo size, and
the like. These metrics—with a few notable exceptions such as logons current and opened
cursors current—are cumulative, which means that their values increase during the lifetime
of the database. Snapshots of the information in the view are available in
the table (in the case of STATSPACK) and in the view (in
the case of AWR); they are described in Listing 10-8. The (snapshot ID) and
(database ID) values are used to identify snapshots—they link to the table
and the view, which contain details such as the time when the snapshot
was created.
Listing 10-8. Tables and Views for Monitoring the Database Workload