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Data base design using IMS/360

Data base or file design is the process of specifying how the data is to be located on and retrieved from the various storage media, and what relationships exist among the keys, data elements, records and files of the data base. Occasionally it is useful to distinguish between file design and file engineering. File design is concerned with the logical relationships among file elements, while file engineering deals with physical concerns such as block size, arm movement optimization, and other hardware dependent factors. Although file design necessarily precedes file engineering, very often several iterations between these two are necessary because file engineering considerations suggest a rethinking of many of the file design approaches.