Using DBCA to Create an Oracle RAC One Node Database
If you have selected to install only the Oracle RAC software on cluster nodes, then you can use Oracle Database Configuration Assistant (DBCA) to configure Oracle RAC One Node.
After installation of Oracle Real Application Clusters (Oracle RAC) software, start Oracle Database Configuration Assistant (DBCA).
When you use DBCA to create an Oracle RAC One Node database, a failover service is automatically configured.