Queue Monitor (QMON) Processes Are Not Removing PROCESSED Messages or Changing the State of WAITING Messages in a RAC Cluster
(Doc ID 732743.1)
Last updated on JULY 25, 2021
Applies to:Oracle Database - Enterprise Edition - Version 10.2.0.1 to 22.214.171.124 [Release 10.2 to 11.1]
Oracle Database Cloud Schema Service - Version N/A and later
Oracle Database Exadata Express Cloud 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.
Intermittently in a RAC Cluster queue monitor worker processes are not removing PROCESSED messages which is leading to queue tables growing in size and eventually exhausting the space in the tablespace.
In addition to this messages enqueued with a DELAY specified and are in a WAITING state may not have their state changed to READY to make them available for dequeue at the appropriate time.
This issue can arise without any kind of reconfiguration having taken place in the RAC cluster.
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