Assuming your stats below are for the same query, your tkprof is only accounting for 32945 executions while the statspack is accounting for almost 1 million executions so you're not comparing apples to apples. Regards, Brandon -----Original Message----- From: oracle-l-bounce@xxxxxxxxxxxxx [mailto:oracle-l-bounce@xxxxxxxxxxxxx] On Behalf Of Zhu,Chao call count ------- ------ Execute 32945 Executions ------------ 960,368 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. -- //www.freelists.org/webpage/oracle-l