Well, I've found bug 6774260, so I'd suggest you open a SR with Oracle and reference both this bug and it's base bug. HTH Guillermo Alan Bort DBA / DBA Main Team EDS, an HP company -----Original Message----- From: oracle-l-bounce@xxxxxxxxxxxxx [mailto:oracle-l-bounce@xxxxxxxxxxxxx] On Behalf Of Ravi Madabhushanam Sent: Thursday, October 30, 2008 11:45 AM To: oracle-l@xxxxxxxxxxxxx Subject: how to troubleshoot enq: WL - contention? Hi , We have been facing issues with our rman backups in cluster & in non-cluster envoronments due to this "enq: WL - contention". The rman backup just hangs at this point. Generally this is happening when we execute some command like "alter system archive log current". This is a recommended command to execute as part of backup procedure. Can any one please guide me to some resource where i can find more information about this. Thanks, Ravi.M -- //www.freelists.org/webpage/oracle-l -- //www.freelists.org/webpage/oracle-l