New Characteristics of the ORDBMS and Their Effect on Query Optimization
Yin Xianliang Wu Hai Assoc. Prof; College of Computer. Sci. & Tech., HUST, Wuhan 430074, China.
New characteristics of the ORDBMS are introduced, the ORDBMS should support the types of data and functions defined by users; complex objects and big objects can be stored under their mechanism of storage; the structure of index of the ORDBMS must be classified by classes; the ORDBMS must support the inheritance of data and functions. This paper discusses the effect of these characteristics on the optimization of query policy, points out that the traditional query policy should not be fit for these new characteristics and puts forward the model of query optimization based on cost.
【CateGory Index】： TP311.13