My Oracle Support Banner

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 AUGUST 04, 2018

Applies to:

Oracle Database - Enterprise Edition - Version 11.2.0.4 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

To view full details, sign in with your My Oracle Support account.

Don't have a My Oracle Support account? Click to get started!

My Oracle Support provides customers with access to over a million knowledge articles and a vibrant support community of peers and Oracle experts.