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How can I determine whether I have problems with Oracle enqueues?

April 26, 2017determine enqueues Oracle problems

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How can I determine whether I have problems with Oracle enqueues?

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Carry out a wait event analysis in accordance with Note 619188 to determine whether the general database performance is impaired by enqueues or whether long-running transactions must wait for enqueues.While there was only one generic wait event “enqueue” up until Oracle 9i, Oracle 10g or higher differentiates between the different enqueue types and causes for the wait event. For example, “enq: TX – allocate ITL entry” denotes an enqueue in the Interested Transaction List in the block header.