Performance Degradation Due to Large AQ Uncommitted Transaction of Messages
Last updated on FEBRUARY 08, 2017
Applies to:Oracle Database - Enterprise Edition - Version 18.104.22.168 and later
Information in this document applies to any platform.
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.
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