High Waits For "Channel Operations Parent Latch" Childlatch when Listening on Advancing Queueing Queues
(Doc ID 790617.1)
Last updated on AUGUST 04, 2018
Applies to:Oracle Database - Enterprise Edition - Version 10.2.0.1 to 10.2.0.4 [Release 10.2]
Oracle Database - Enterprise Edition - Version 22.214.171.124 to 126.96.36.199 [Release 11.1]
Information in this document applies to any platform.
Checked for relevance on 06 May 2013
An Advanced Queueing application is being used and there are multiple sessions performing Listen operations on single and multiple-consumer queues.
Running AWR report shows a very high number of "latch free" waits.
At certain periods of time there is very heavy contention for a particular "channel operations parent latch" (child#=59). This latch is associated with the "AQ post/wait channel 1" broadcast channel.
An AWR snapshot of latch locations shows:
|channel operations parent latch||ksrchreset()||0||442,410||72,469|
An example stack from a waiting session is
kwqilintl -> kwqidlisten -> ksrchreset -> ksrmfree -> kslgetsl
To view full details, sign in with your My Oracle Support account.
Don't have a My Oracle Support account? Click to get started!
In this Document