TCP / IP network based graduates ' information management and query system TCP/IP网络下的毕业生信息管理与查询系统
This paper analyzes the characteristics, strategies and aims of query optimization in the Network Data Base Management System, and then advances a mathematic model of technique of query optimization. 本文首先分析了在NDBMS(NetworkDataBaseManagementSystem,网络数据库管理系统)中查询优化的特点、策略和目标,提出了查询优化的数学模型。
But most of the returned information is unuseful for network management center because there is so much " trash " that it reduce the query efficiency, on the other hand, the unuseful information also results in the network congestion in bandwith. 网管中心所获信息中有很大一部分是它所不需要的,即垃圾数据,而这些垃圾数据一方面降低了查询的效率,另一方面则导致了网络拥塞。
With the emergence of data streaming applications, such as the financial analysis, network monitoring, and sensor data monitoring and controlling, a new data management technology, query processing over data stream, has obtained a very large development. 随着金融分析、网络监控、传感器数据监控等新型数据流应用的出现,催生了一种新的数据管理技术&数据流查询处理,数据流查询处理技术已经在数据流应用中获得了较大的发展。
The library information service system in the network environment is the network management by computer used for literature collection, circulation management, data statistics, public query, consultation, the information resources development, etc. 网络环境下图书馆信息服务体系正是在计算机技术支持下进行的文献采编、流通管理、数据统计、公共查询、参考咨询、信息资源开发等服务功能的网络化管理。