Defines a path name for a relational database (Format 1) or a
       path name for a Oracle CODASYL DBMS database instance (Format 2).

       Format 1

         DEFINE DATABASE  rdb-database-path  ON  root-file-spec;

       Format 2

         DEFINE DATABASE  dbms-database-path

              [USING]  [SUBSCHEMA]  subschema-name

              [OF]  [SCHEMA]  schema-path-name

              ON  root-file-spec;