While it is happening, get a system state dump of the ASM instance... Looks a lot like the reverse of Bug 4666299 - deallocating rather than allocating extents. -----Original Message----- From: oracle-l-bounce@xxxxxxxxxxxxx [mailto:oracle-l-bounce@xxxxxxxxxxxxx] On Behalf Of Luca Canali Sent: Monday, May 22, 2006 1:09 PM To: oracle-l@xxxxxxxxxxxxx Subject: KSV master wait Hi, I am trying to understand the wait event: 'KSV master wait'. I run 'drop tablespace TBSNAME including contents and datafiles;' from sqlplus and I see that my session waits (for a long time) on 'KSV master wait'. What is that? My environment is: Oracle 10.2.0.2 on Linux x86 + RAC + ASM. Thanks, Luca -- //www.freelists.org/webpage/oracle-l -- //www.freelists.org/webpage/oracle-l