Research on query optimization algorithm of multi database system based on Distributed Database

Multi-database system is an efficient way to realize data sharing and interoperability of multiple distributed heterogeneous data sources. A multi-data system architecture model based on COM/DCOM is introduced. This solution can effectively integrate various distributed and heterogeneous database systems. The development of this system plays an important role in the application of enterprise integration system and so on. Distributed query processing is the interface between users and distributed databases, and it is also one of the main issues in distributed database research. Due to the rapid development of database application requirements, especially the rapid development of computer network and digital communication technology, people began to study distributed database systems in the mid-1970s. Distributed database is the result of mutual penetration and organic combination of database technology and network technology. It is an important branch in the field of database and has become one of the most active research fields of computer technology.