Distributed Object-oriented Database Query Optimization And Applied Research

Along with the time, speed up the pace of informationization development non-structured data, complex data increasingly diverse forms. In order to adapt to the needs, a new generation of databases, the object-oriented database has a pivotal role. In practical applications, distributed applications, its broader query optimization is most important to the current application research. But in distributed object-oriented database query optimization aspects some questions:1. VSQL, query language (similar forms SQL in RDB), due to the characteristics of object-oriented database, sort of inheritance. Inquires, the relative an object when character may form multiple external relevance path. But the truth is in the internal relationships path to more efficient operation can convert to achieve optimization?2. The current query, in many stations when data replication at object for the unit,, but for large object is concerned, can cause network transmission large quantity, whether to change the situation?3. A query process may be divided into several phases, query existing some optimization of processing method, whether also can do some research in this area?4. in many of the object-oriented database products, pure distributed object-oriented database less, but its cross much database of seamless data distributed properties make data literacy is greatly increased. There is also the application optimization, how to use better inquires the methods to will be distributed object-oriented database application in oilfield project?To these questions research and discussion, will help promote the deeper object-oriented database to develop better, to help guide practical application. In view of the above questions, using distributed object-oriented database Versant as study platform, certain oilfield drilling in the development of the dynamic database management in the background, through the proposed scheme, physical model and query design algorithm, application practice, finally the conclusion:1. In distributed object-oriented database system for a class do, formation of external relevance path query can be converted to internal relationships path;2. And for many stations data replication, can be done first choice, projection operation, reoccupy Hash hashing method for data redundancy can greatly reduce the network information transmission of data between wetness;3. IF object quantity quality more big, application optimization method in this paper, obvious effects;4. With more properties, application optimization obvious effects;5. These methods can be applied to practical projects, to reach optimization purposes.