Optimizing entity join queries by extended semijoins in a wide area multidatabase environment

P. S. Tsai, Arbee L. P. Chen
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引用次数: 4

Abstract

We consider processing entity join queries in a wide area multidatabase environment where the query processing cost is dominated by the cost of data transmission. An entity join operation "integrates" tuples representing the same entities from different relations in which inconsistent data may exist. The semijoin technique has been successfully used in a distributed database system to reduce the cost of data transmission. However, it cannot be directly applied to process the entity join query. An extension of the traditional semijoin, named extended semijoin is proposed to reduce the cost of data transmission for entity join query processing in a wide area multidatabase environment.
在广域多数据库环境中通过扩展半连接优化实体连接查询
我们考虑在广域多数据库环境中处理实体连接查询,其中查询处理成本主要由数据传输成本决定。实体连接操作“集成”来自可能存在不一致数据的不同关系的表示相同实体的元组。半连接技术已成功应用于分布式数据库系统中,降低了数据传输的成本。但是,它不能直接应用于处理实体连接查询。为了降低广域多数据库环境下实体连接查询处理的数据传输成本,提出了对传统半连接的一种扩展半连接。
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