Oracle recommends that you complete these tasks after completing an Oracle RAC installation.

• Setting Up Additional User Accounts
  You can set up additional user accounts to manage your database.
• Setting the Oracle User Environment Variables
  Unlike on other platforms, do not set ORACLE_HOME as a fixed environment variable when running Oracle Database on Windows operating systems. This is because the Oracle software determines where executable files reside at run time.
• Updating the Oracle ORAchk Health Check Tool
  Update the existing version of your Oracle ORAchk utility to perform proactive heath checks for the Oracle software stack.
• About Using CVU Cluster Healthchecks After Installation
  You can use the CVU healthcheck command to check your Oracle Clusterware and Oracle Database installations for their compliance with mandatory requirements and best practices guidelines, and to ensure that they are functioning properly.