Understanding Autonomy and Consistency in Multidatabase Systems

多数据库系统满足了组织的以下需求： 支持需要由多个 自治的和可能异构的数据库系统。 一 多数据库系统的基本要求是 保持各个数据库系统的自主性。 然而，自治需求在维护方面会引起问题， 这些系统中的传统数据库一致性， 自主性和一致性是相互冲突的要求。 试图在这两个要求之间取得平衡， 专注于新的正确性标准。 然而，很少有分析 （a）自治的语义学 要求和（B）它们对一致性的影响 要求和实施考虑。这个目标 研究是系统地分析自主性和一致性， 应用统一规范技术来表示自治 要求和正确性标准，从而明确显示 它们之间的关系，并确定它们之间的权衡。 通过 了解这些权衡及其对不同部分的影响 的数据库系统，这项工作将有助于发展 多数据库系统的集成将产生影响 其他系统，其中自治和一致性是要求。

Multidatabase systems respond to the need of organizations to support applications that require information maintained by several autonomous and possibly heterogeneous database systems. A fundamental requirement underlying Multidatabase systems is the preservation of the autonomy of the individual database systems. However, autonomy requirements cause problems in maintaining traditional database consistency in these systems, the reason being that autonomy and consistency are conflicting requirements. Attempts to strike a balance between these two requirements have focused on new correctness criteria. However, very little analysis has been done with respect to (a) the semantics of autonomy requirements and (b) their implications for both consistency requirements and implementation considerations. The goal of this research is to systematically analyze autonomy and consistency by applying a uniform specification technique to express autonomy requirements and correctness criteria, thereby explicitly showing their relationships and identifying the tradeoffs between them. By understanding these tradeoffs and their effects on different parts of a database system, this work will help in the development of Multidatabase systems and will have an impact on the integration of other systems in which autonomy and consistency are requirements.