High CPU Utilization when performing a Conditional Dequeue
(Doc ID 846473.1)
Last updated on JULY 27, 2021
Applies to:
Oracle Database - Enterprise Edition - Version 10.2.0.1 to 10.2.0.5 [Release 10.2]Oracle Database - Enterprise Edition - Version 11.1.0.6 to 11.1.0.7 [Release 11.1]
Oracle Database Cloud Schema Service - Version N/A and later
Gen 1 Exadata Cloud at Customer (Oracle Exadata Database Cloud Machine) - Version N/A and later
Oracle Cloud Infrastructure - Database Service - Version N/A and later
Information in this document applies to any platform.
Symptoms
Queries related to dequeue by condition and specifically in accessing the view (new in 10.2.) aq$_<queue_table>_f are significantly slower in 10.2 than they had been in 9.2.
A feature of the issue is :
- high CPU associated with accessing the view : aq$_<queue_table>_f , as well as
- a high number of buffer gets per execution.
Changes
Upgrade to 10.2
Cause
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In this Document
| Symptoms |
| Changes |
| Cause |
| Solution |
| References |