子包含技术用于查询优化

Subsumption Technique Using in Query Optimization

目前在面向对象的数据库中，查询优化多集中于调整代数表达式和物理访问数据库的内容上，而语义查询优化由于其层次复杂性而受到限制。本文构造了一种ＯＯＤＢ模式，并建立相应的视图及查询模型，确定它们之间的子包含关系，以达到查询优化的目的。

Most work on query optimization in OODB has concentrated on tuning algebraic expressions and the physical access to the database contents. The attention to semantic query optimization, however, has been restricted due to its inherent complexity. Here, we construct an OODB schema that recognizes subset relationships between a query and a view, through which we can gain the object of query optimization.