数据访问层中的数据库操作通常是现行多层式架构管理信息系统中制约系统整体运行效率的瓶颈.为提高多层式管理信息系统的效率,提出了支持动态负荷调整的多层式管理信息系统构建方案.该方案提出在数据访问层内设立连接池,建立数据生产使用流程的异步模型来实现信息数据的生产者与使用者的相对分离,以有效降低系统整体负荷,提高利用率;通过基于过程调整参数设计建立动态负荷调整因子算法和"放大缩小"处理策略,根据用户连接次数和系统环境需求等因素动态设置调整因子,以加快动态负荷调整过程的收敛性、响应性和系统的稳定性.通过采用先进先出(FIFO)和随机(Random)调度算法对已建支持动态负荷调整的系统架构进行了模拟测试.测试结果表明,基于动态调整连接池的系统构建方式不仅能够有效提高信息系统的承载能力,而且还有利于信息系统的维护修改和功能扩充,能满足信息系统平台未来多元化和综合化发展的需求.%Database operation in data access layer is often the technical bottleneck of management information system with multi-layer structure,which restricts its promotion of operation efficiency. In order to enhance the efficiency of the information system,a scheme for constructing multi-layer information system supported by dynamic load adjustment has been presented where connection pool is designed and built to lower the whole load of the information system as well as a asynchronous model involving the generation and exploitation of information data is constructed to improve the system utilization rate. Furthermore, a dynamic load adjustment factor and its algorithm have been designed and established based on several process adjustment parameters according to the number of user connection and re-quirement for environments of the information system,besides a treating strategy named zoom-in-and-out has been determined to pro-mote the constringency and response of dynamic load adjustment and reliability of the whole system. A simulation test of the constructed multi-layer information system supported by dynamic load adjustment has been conducted employing both First-in-First-out ( FIFO) and random regulating algorithm. Results of the test shows that the method for building information system based on dynamic load adjust-ment pool can not only boost the effective carrying capacity but also can make modification of system maintenance and enlargement of system functions easier and that the method can satisfy technical requests on multi-functional and integrative development of future infor-mation system.
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