--------- ------------------- -------- ---------
Begin Snap: 33128 28-Apr-09 10:00:2018 #########
End Snap: 33129 28-Apr-09 11:00:1618 #########
Elapsed:
59.93 (mins)
DB Time:
117.32 (mins)
为什么ELAPSED 1小时, 而DB TIME 是2小时啊?
Time% Total
Statistic Name
(seconds) DB Time
--------------------------------------------- -------------- -----------
sql execute elapsed time
7,046.36100.10
PL/SQL execution elapsed time
7,042.28100.05
DB time
7,039.04100.00
DB Time
Amount of elapsed time (in microseconds) spent performing Database user-level calls. This does not include the time spent on instance background processes such as PMON.
The most important of the time model statistics is DB time. 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.
