You can configure Oracle Database Vault after installation using Oracle Database Configuration Assistant (DBCA), or choose not to configure Oracle Database Vault.

1. After installing Oracle RAC, create the database.
2. Start DBCA and select the option Configure Database.
3. In the component list, select Oracle Label Security and Oracle Database Vault.
4. Provide the required Oracle Database Vault user IDs and passwords to proceed with configuration. To enable a separate Oracle Database Vault administrator, choose to configure the DV_ACCTMGR user.
5. After you have finished, restart each database instance to finish the software configuration.