This statistics represents
the total time spent in database calls and is a indicator of the total instance workload.
It is calculated by aggregating the CPU and wait times of all sessions not waiting on
idle wait events (non-idle user sessions).
DB time is measured cumulatively from the time that the instance was started.
Because DB time it is calculated by combining the times from all non-idle user
sessions, it is possible that the DB time can exceed the actual time elapsed since the
instance started up. For example, a instance that has been running for 30 minutes
could have four active user sessions whose cumulative DB time is approximately 120
minutes.
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