Index files for dBASE contain index tags for each index that exists for a database file. These index tags can be marked as unique, that is, the driver will ensure that no duplicate values exist for the columns that define the index tag. The unique attribute is not natively supported by the dBASE or FoxPro products. The enforcement and recognition of the unique attribute is an extension of the dBASE driver. The driver must be notified that index tags are unique. No configuration is needed for unique indexes that were created using the DataDirect Connect
for ODBC dBASE driver. When using files that were not created with the dBASE driver, you must define unique index tags as outlined in the following procedure.