Review this information to understand about Oracle Database Configuration Assistant (DBCA) actions during Oracle RAC database creation.
After you respond to DBCA prompts, review the Summary dialog information and click OK, DBCA performs several actions.
Creates an Oracle RAC database, and its instances
Creates the Oracle RAC data dictionary views
Starts the Oracle services if you are on a Windows-based platform
Starts the Oracle Clusterware high availability services
Starts the database instances across cluster nodes
Caution:
After you have created the Oracle RAC database, if you decide to install additional Oracle Database products in the Oracle RAC database you have created, then before you attempt to install the products, you must stop all processes running in the Oracle RAC database homes.
You must stop all processes running in the Oracle RAC homes so that Oracle Universal Installer can relink certain executables and libraries. Refer to "Preparing to Upgrade an Existing Oracle RAC Database" for additional information.