You can see if there are fields that are wasting space, with unused bytes. Then you have the numbers necessary for you to modify the structure to narrow them, without losing any data. You can "trim" down your datafile in size, and help it run faster.
Field Length Analysis: C:\DATA\ACCESS_LOG.DBF Field Field Data Used Extra Records Number Name Type Len Dec Length Bytes Used 1 FROM C 50 0 48 2 14067 2 D1 C 10 0 1 9 14067 3 D2 C 10 0 6 4 14067 4 DATETIME C 30 0 21 9 14067 5 D5 C 50 0 6 44 14067 6 GET C 50 0 50 0 14067 7 D200 C 10 0 3 7 14067 8 D100 C 10 0 7 3 14067 9 HTTP C 50 0 50 0 14067 10 BROWSER C 50 0 50 0 14067