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Performance Degradation Due to Large AQ Uncommitted Transaction of Messages (Doc ID 1929470.1)

Last updated on AUGUST 04, 2018

Applies to:

Oracle Database - Enterprise Edition - Version 12.1.0.2 and later
Information in this document applies to any platform.

Goal

To understand why large AQ uncommitted transaction of messages, which has been enqueued into a single consumer queue using retention, which causes performance degradation, is an expected behavior.

An example of this, is appears when a dequeue session performs a 'db file sequential read' operations on the associated AQ$_<QT>_I dequeue index and undo segments.

 

 

Solution

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