QUALITY OF DATA MODEL SCHEMES. PRINCIPLE OF MINIMAL REDUNDANCY AND MINIMUM REDUNDANT STRUCTURES OF DATA MODELS. I
In the first part of this article the minimum redundant structures of database are introduced. Such structures are destined to hold actual values of one-valued and many-valued variable properties of entities. The results of the execution of the typical Select-expressions have been represented. These results corroborate the expediency of the data repetition which are belonged to reference objects. Some structured data types that are the cause of redundant tuples have been investigated. Such structures eliminate the generation of reluctant tuples at the databases. The solutions of modifying these structures have been proposed.
Keywords: data model, redundance of data structures, tuple, property, integrity constrain, onevalued and many-valued properties, normalization and normal forms of relations.
