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.
在电信网管系统中，为了对电信设备进行管理和性能优化，数据查询操作是必不可少的。
In telecommunication network management system, in order to carry on the management and the optimizing performance to the telecommunication equipment, the data inquiry operation is essential.
该网络发布系统具有图层控制与管理、数据查询检索、基本信息的空间分析操作功能。
This issuance system possesses multi-functions of map-layer control and management, data searching and retrieval, and spatial analysis operation of basic information.
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