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Segment Synthesis in Logical Data Base Design

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2 Author(s)
Wang, C.P. ; Advanced Systems Development Laboratory, Yorktown Heights, New York, 10598, USA ; Wedekind, H.H.

Identification and representation of entities and their relationships relevant to an application are some of the key problems in logical data base design. This paper presents an approach to synthesizing logical segments that are representations of such entities and relationships. The major steps in this design are 1) collect all the pertinent functional relations in the application domain; 2) remove redundant relations to obtain a minimal covering set; 3) minimize the number of relations in the covering set to obtain an optimal set of relations in the third normal form; and 4) combine relations into logical segments according to prescribed performance requirements and projected information maintenance activities. Synthesis of logical segments for an airline reservations application is used as an illustrative example.

Note: The Institute of Electrical and Electronics Engineers, Incorporated is distributing this Article with permission of the International Business Machines Corporation (IBM) who is the exclusive owner. The recipient of this Article may not assign, sublicense, lease, rent or otherwise transfer, reproduce, prepare derivative works, publicly display or perform, or distribute the Article.  

Published in:

IBM Journal of Research and Development  (Volume:19 ,  Issue: 1 )