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Controlling FD and MVD inferences in multilevel relational database systems

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2 Author(s)
Su, T.-A. ; Dept. of Comput. Sci. & Eng., Toledo Univ., OH, USA ; Ozsoyoglu, G.

The authors investigate the inference problems due to functional dependencies (FD) and multivalued dependencies (MVD) in a multilevel relational database (MDB) with attribute and record classification schemes, respectively. The set of functional dependencies to be taken into account in order to prevent FD-compromises is determined. It is proven that incurring minimum information loss to prevent compromises is an NP-complete problem. An exact algorithm to adjust the attribute levels so that no compromise due to functional dependencies occurs is given. Some necessary and sufficient conditions for MVD-compromises are presented. The set of MVDs to be taken into account for controlling inferences is determined. An algorithm to prevent MVD-compromises in a relation with conflict-free MVDs is given

Published in:

Knowledge and Data Engineering, IEEE Transactions on  (Volume:3 ,  Issue: 4 )

Date of Publication:

Dec 1991

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