一种新的多级关系的多实例化完整性约束

[1990] Proceedings. The Computer Security Foundations Workshop III Pub Date : 1990-06-12 DOI:10.1109/CSFW.1990.128196

R. Sandhu, S. Jajodia, T. Lunt

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引用次数: 25

摘要

基于关系中的每个实体对每个访问类最多只能有一个元组的直观思想，提出了一种新的多级关系的多实例化完整性约束。讨论了这一性质的结果及其一些变化。确定了应用于所有关系的一组核心属性。它们是PI-FD意义上的实体完整性、实例间完整性、包容完整性和多实例化完整性。特定的模型施加了额外的多实例化约束。奥克兰需要PI-null，海景需要PI-MVD，而新的Franconia模型需要PI-Tuple-class。在实践中，这些属性中的每一个似乎都可能经常出现，以证明DBMS(数据库管理系统)在逐个关系的基础上支持其实施。

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A new polyinstantiation integrity constraint for multilevel relations

A new polyinstantiation integrity constraint for multilevel relations based on the intuitive idea that every entity in a relation can have at most one tuple for every access class is proposed. The consequences of this property and some of its variations are discussed. A core set of properties which should apply to all relations is identified. These are entity integrity, interinstance integrity, subsumption integrity, and polyinstantiation integrity in the sense of PI-FD. Specific models impose additional polyinstantiation constraints. Oakland requires PI-null, Sea View requires PI-MVD, and the new Franconia model requires PI-Tuple-class. Each of these properties appears likely to arise often enough in practice to justify DBMS (database management system) support for its enforcement on a relation-by-relation basis.<>

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[1990] Proceedings. The Computer Security Foundations Workshop III

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