Query optimization: the goals of query optimization in distributed data integration system are different from those in traditional database system.
查询优化：分布式数据集成系统查询优化的目标与集中式数据库有所不同。
As most CIMS is running in network environment, distributed database is the main database technology in CIMS integration.
因为CIMS大多数是运行在网络环境之下，所以分布式数据库技术是实现CIMS集成的关键。
The metadata method for Flood Control General DataBase (FCGDB) integration is proposed in accordance with the distributed and heterogeneous characteristics of FCGDB.
根据防汛综合数据库的异构、分布特征，提出集成防汛综合数据库的元数据方法。
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