How to Enable VNCR on RAC Database to Register only Local Instances
(Doc ID 1914282.1)
Last updated on FEBRUARY 03, 2020
Applies to:Oracle Net Services - Version 188.8.131.52 to 184.108.40.206 [Release 11.2 to 12.2]
Oracle Database - Enterprise Edition - Version 220.127.116.11 to 18.104.22.168 [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 22.214.171.124 and enhanced in 126.96.36.199.
Starting with 188.8.131.52 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 184.108.40.206 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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