Hi List, I just compared all latches and events from 11.1.0.6 and 11.1.0.7 (just for my own amusement). there are quite some changes in v$latch and v$event_name [1]. Unfortunately, I did not find any view which gives me a list of all mutexes. Does someone here knows how to gather this list? v$mutex_sleep_history does not help, as I does not know how to stress the to get all mutexes listed there. thank you all, Martin Berger [1] http://berxblog.blogspot.com/2008/09/latches-and-events-from-11106-to-11107.html -- //www.freelists.org/webpage/oracle-l