To configure Oracle Database Vault after installing Oracle RAC:

1. Install the Oracle RAC Enterprise Edition database.

2. Stop all database processes.

3. Enter the following commands:

   $ make -f $ORACLE_HOME/rdbms/lib/ins_rdbms.mk dv_on
   $ make -f $ORACLE_HOME/rdbms/lib/ins_rdbms.mk ioracle
   

4. Start up all Oracle RAC processes.

5. Start DBCA, and select the option Configure Database.

6. In the component list, select Oracle Label Security and Oracle Database Vault.

7. Provide the required administrative user accounts and passwords, and proceed with configuration.