I'm not sure on this - I thought that time waiting in the CPU run queue was included in the v$sql.cpu_time and "CPU used by this session" stats, but according to slide 20 here, it looks like maybe the time in the CPU run queue is actually accounted for in the IO wait event instead: http://www.oracle.com/technetwork/database/features/manageability/db-perf-tuning-ow08-131582.pdf ________________________________ Privileged/Confidential Information may be contained in this message or attachments hereto. Please advise immediately if you or your employer do not consent to Internet email for messages of this kind. Opinions, conclusions and other information in this message that do not relate to the official business of this company shall be understood as neither given nor endorsed by it.