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

Last updated on FEBRUARY 08, 2017

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

Sign In with your My Oracle Support account

Don't have a My Oracle Support account? Click to get started

My Oracle Support provides customers with access to over a
Million Knowledge Articles and hundreds of Community platforms