Enqueues
                                                 Last update (2011-04-08 09:50:26)
                                                                                                                   Date added (2008-02-28 13:26:10)

Summary
If you see a wait event of type:enqueue then this is related with transaction locking, with other words there is a blocked session

To find who is blocking it execute the query: Blocking sessions

The tip is obvious! Killing the blocking session disappears the enqueue
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