Research On Distributed Database Technology And Its Application In The Integration Of Battle-field Information System

Under the impetus of application of distributed database, it has been the central issue of database technology that how to solve the question of data inconsistency caused by the distribution of geographical position and other reasons.This dissertation focused on the application of distributed database technology in the integration of battle-field information system. First,it introduced battle-field information system, raised the problem of information lonely island, and indicated the sense of the application of distributed database in battle-field information system; Discussed the technology of distributed database,integration of distributed database in detail; Started with the destination of battle-field database designation, selection of database, construction of battle-field database, access of battle-field information database and query processing,query optimization, this dissertation made a solution of battle-field information database system; Take platform of battle-field information gathering for example, made a detailed research on the key technology of distributed database technology used in the integration of battle-field database system.Global Query Language is the precondition of distributed query, this dissertation designed a GSQL based on encapsulation of T-SQL, to co-operate with the complier that set at the side of the platform, it solved the problem of the high cost of training and that attached to some kind of mature database management system, it could not be applied in Access. After making an in-depth research on methods of global query processing, the dissertation elaborated several rules that proposed to be obeyed in optimizing query, and then gave the operation details. Combining with the experience of practice, simplified the flow of global query decomposing with a method of inserting flag. Focusing on the method of data delivering and integration of system, after that elaborated the method of database synchronization based on data-delivering and the method of integration based on data duplication,after all, give the solution of the confliction in data duplication.What is discussed in the dissertation is the practical application of integration of battle-field information system in the practice of army information construction, through the research of integration solution that made use of theory and technology of distributed database, it successfully solute the problem of lonely island that the isolated battle-field information system,and it make great sense.