Performance Degradation Due to Large AQ Uncommitted Transaction of Messages
(Doc ID 1929470.1)
Last updated on JANUARY 11, 2023
Applies to:
Oracle Database - Enterprise Edition - Version 12.1.0.2 and laterOracle Database Cloud Schema Service - Version N/A and later
Oracle Database Exadata Express Cloud Service - Version N/A and later
Oracle Database Exadata Cloud Machine - Version N/A and later
Oracle Database Cloud Exadata Service - Version N/A 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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In this Document
| Goal |
| Solution |
| References |