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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 later
Oracle 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


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