Hallo Cheng , for example, if you insert row in a table and trigger makes some work , you will see the ressource consumption twice in statspack - the 'master' insert and the statements from trigger. Or if you run a job , you will see the job consumption and consumption of the statements from this job. I would check the statements text and look for dependencies, if some sql is executed behind of some other. Best Regards, Petr ________________________________________ Von: oracle-l-bounce@xxxxxxxxxxxxx [oracle-l-bounce@xxxxxxxxxxxxx]" im Auftrag von "Ls Cheng [exriscer@xxxxxxxxx] Gesendet: Dienstag, 13. November 2012 14:20 An: Oracle Mailinglist Betreff: Re: DB CPU is much lower than CPU Time Reported by TOP SQL consumers Hi I have 16 CPU so figure, 57600 seconds per hour CPU power. But I am not looking weather I am CPU or IO bounded. I wonder why sql cpu time is much larger than db cpu reported TIA -- LSC -- //www.freelists.org/webpage/oracle-l -- //www.freelists.org/webpage/oracle-l