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What are Oracle enqueues?

April 26, 2017enqueues Oracle

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What are Oracle enqueues?

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Oracle enqueues are locks at database level that coordinate parallel access to Oracle resources such as objects or data records. For example, enqueues are responsible for several transactions not being able to change the same data record at the same time.Enqueue requests are divided into queues whose requests are then processed in the chronological sequence of their arrival. This is an important difference to Oracle latches (Note 767414), for which there are no queues.Oracle enqueues are often also referred to as exclusive lockwaits.