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How do I find out which sessions are currently holding enqueues or waiting for enqueues?

April 26, 2017Currently enqueues holding sessions waiting

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How do I find out which sessions are currently holding enqueues or waiting for enqueues?

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The V$SESSION_WAIT view or the Oracle session overview (transaction ST04 “Detail Analysis Menu -> Oracle Session”) displays the wait event “enqueue” (Oracle 9i or lower) or “enq: – ” (Oracle 10g or higher) if a session is waiting for an enqueue (see Note 619188).