How to Enable VNCR on RAC Database to Register only Local Instances
(Doc ID 1914282.1)
Last updated on MARCH 31, 2022
Applies to:Oracle Net Services - Version 22.214.171.124 to 126.96.36.199 [Release 11.2 to 12.2]
Oracle Database - Enterprise Edition - Version 188.8.131.52 to 184.108.40.206 [Release 11.2 to 12.2]
Information in this document applies to any platform.
Explains the VNCR or Validnode checking registration option that was introduced in 220.127.116.11 and enhanced in 18.104.22.168.
Starting with 22.214.171.124 we have the option of using VNCR to protect the listener from having remote/unknown instances registering to it.
See <Note 1600630.1> Valid Node Checking For Registration (VNCR)
On 126.96.36.199 RAC databases, the parameter VALID_NODE_CHECKING_REGISTRATION_listener_name is set to off.
However, sometimes this allows other instances in the same subnet to register against these listeners. We want to prevent that and allow only local instances to that RAC database to be registered with these listeners.
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