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Propagation Blocked by Qmon Process - Streams_queue_table / 'library cache lock' waits (Doc ID 460471.1)

Last updated on AUGUST 30, 2021

Applies to:

Oracle Database Cloud Exadata Service - Version N/A and later
Oracle Database Cloud Service - Version N/A and later
Oracle Database - Enterprise Edition - Version to [Release 10.2 to 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
Information in this document applies to any platform.


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Streams Propagation
No messages are propagated and attempting to stop the queue does not complete.
From a system state dump/ level 266 the following are observed:

- the relevant qmon worker / q0* is holding a shared lock on the Streams
queue (mode=S);
- this process is performing : 'db file sequential read';
- this process shows in its stack the functions :

.. kwqbmrcvq() kwqbmrcvmain() kwqmnslv() ...

- other processes are waiting on this process to complete




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