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High "channel operations parent latc" (latch) Wait Time when Purging an AQ Queue (Doc ID 1942691.1)

Last updated on FEBRUARY 16, 2022

Applies to:

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


An AQ PURGE operation: DBMS_AQADM.PURGE_QUEUE_TABLE() appears to be taking too long.
So, the job is killed.
However, the following high wait events are then observed;
'Latch free'
'channel operations parent latc' (latch)

On examination, the AQ SUBSCRIBER table AQ$_<QUEUE_TABLE_NAME>_N has a high count i.e. 247,368,653




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