In addition to the functions and procedures made available from the DVSYS schema, the DVF schema contains a single function for each factor defined in the system. Oracle Database Vault maintains these functions when you use the DBMS_MACADM PL/SQL package to manage the various factors. The functions are then available to the general database account population through PL/SQL functions and standard SQL. This enables factors to be used in Oracle Label Security, Oracle Virtual Private Database (VPD), and so on.