The distributed data query is the core of the distributed database managing system, but the optimized query algorithm is the key technology in query processing.
分布式数据查询是分布式数据库管理系统的核心，而查询优化算法又是查询处理中的关键技术。
The distributed data query is the core of the distributed database managing system, but the optimized query algorithm is the key technology in query processing.
多级安全查询处理器是多级安全数据库的核心部分，它提供对安全级查询的支持。
The distributed data query is the core of the distributed database managing system, but the optimized query algorithm is the key technology in query processing.
多级安全查询处理器是多级安全数据库的核心部分，它提供对安全级查询的支持。
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