Just curious - why would you suspect it to be a DDL operation? Seems to me that DML would be more likely. Also, you say "another DDL", as if SELECT FOR UPDATE WAIT is also a DDL statement. Maybe it was just a typo, or am I missing something? -----Original Message----- From: oracle-l-bounce@xxxxxxxxxxxxx [mailto:oracle-l-bounce@xxxxxxxxxxxxx] On Behalf Of Stephane Faroult Sent: Wednesday, June 21, 2006 10:26 AM To: stuart.clowes@xxxxxxxxx Cc: oracle-l@xxxxxxxxxxxxx Subject: Re: Detecting SELECT FOR UPDATE WAIT ... failures It is most likely to result from another DDL operation against the same table. 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