Is he doing a 'FOR UPDATE' at the end of the SELECT? Chris Taylor Sr. Oracle DBA Ingram Barge Company Nashville, TN 37205 Office: 615-517-3355 Cell: 615-354-4799 Email: chris.taylor@xxxxxxxxxxxxxxx -----Original Message----- From: oracle-l-bounce@xxxxxxxxxxxxx [mailto:oracle-l-bounce@xxxxxxxxxxxxx] On Behalf Of genegurevich@xxxxxxxxxxxx Sent: Thursday, December 20, 2007 11:44 AM To: oracle-l Subject: Do selects block truncates? Hi all: I am running oracle 10.2.0.2 and I see two sessions running truncate commands being stuck. It looks like they are waiting on another session which is currently running a long select. That select accesses both of the tables that the other two sessions are trying to truncate. I was not aware that a select can block a truncate. Is that the case or is there something else here which I am missing? thank you Gene Gurevich -- //www.freelists.org/webpage/oracle-l -- //www.freelists.org/webpage/oracle-l