>>> >>>Cold, hard experience. >>> >>>Bug 2530125 Hang possible with "enqueue hash chains" latch >>>held during deadlock detection >>> >>>Or, as described to me by Oracle Support about 3 years ago, >>>"Deadlock detection dumps the processstate while holding the >>>'parent+children enqueue hash chains' latch which can cause >>>the blocking symptoms you describe while the processtate is dumped. " ..thanks...that would indeed be a bug...an absolutely absurd braindead one in fact! Just think...all these years and a new definition of a critical section...cool! :-) -- //www.freelists.org/webpage/oracle-l