Huge Wait On Database With "enq: CN - Race With Reg" Wait Event With The Use Of Query Change Notification
(Doc ID 2386606.1)
Last updated on MARCH 11, 2019
Applies to:
Oracle Database Cloud Schema Service - Version N/A and laterOracle Database Exadata Cloud Machine - Version N/A and later
Oracle Cloud Infrastructure - Database Service - Version N/A and later
Oracle Database Exadata Express Cloud Service - Version N/A and later
Oracle Database Backup Service - Version N/A and later
Information in this document applies to any platform.
Symptoms
Huge number of database sessions are waiting with wait event "enq: CN - race with reg". Querying the sys.reg$ shows huge number of registrations with LOCATION_NAME of the form "net8://...."
Changes
Client Result Cache feature is enabled at the database level.
Cause
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In this Document
Symptoms |
Changes |
Cause |
Solution |
References |