Oracle PL/SQL Tutorial/System Tables Data Dictionary/user arguments

Check user_arguments table

SQL>
SQL> SELECT object_name, argument_name, overload
  2       , POSITION, SEQUENCE, data_level, data_type
  3    FROM user_arguments
  4   WHERE data_type IN ("LONG","CHAR");
OBJECT_NAME                    ARGUMENT_NAME
------------------------------ ------------------------------
OVERLOAD                                   POSITION   SEQUENCE DATA_LEVEL
---------------------------------------- ---------- ---------- ----------
DATA_TYPE
------------------------------
F1
                                                  0          1          0
CHAR

SQL>
SQL>