For a RDBMS system, such as DB2, the values and physical lengths of the data are as follows:

       TYPE                  VALUES               PHYSICAL LENGTH
Character columns:
 CHAR(length)            Any Character        1 to 254 + 1
 VARCHAR(max)            Any Character        1 to 254 + 1
 LONG VARCHAR(max)       Any Character        1 to 32,765

Numeric columns:
 DECIMAL(total,fract)    30 (15) Digits       total/2 + 1
 INTEGER                 +- 2,147,483,647     5
 SMALL INTEGER           +- 32,767            3
 FLOAT(length)           -5.4E-79 to +7.2E+75 5 if length from 1 to 21
                                              9 if length from 22 to 53

Date/Time columns:
 DATE                    00010101 to 99991231 5
 TIME                    00:00 to 23:59       4
 TIMESTAMP               Any Date-Time        11

Graphic columns:
 GRAPHIC(length)         Any DBCS graphic     2*length + 1 (2 to 254 + 1)
 VARGRAPHIC(length)      Any DBCS graphic     2*length + 1 (2 to 254 + 3)
 LONG VARGRAPHIC(length) Any DBCS graphic     2*length + 3 to data page size

Check with your RDBMS documentation to confirm the values and physical length of data used by your system.