移动实时数据库QoS管理和更新事务调度算法

分布式环境下的移动实时数据库服务应用逐渐广泛,但系统负载的不可预测甚至可能的超载使得应用受到限制.系统中事务在低带宽移动环境下竞争有限的系统资源导致重启或夭折,从而给系统带来损失甚至灾难.通过结合时间有效性和值域的有效性提出基于的一种新的衡量系统性能的参数标准,如错过截止期事务的比率、数据新鲜度、CPU利用率去保证QoS,同时提出一种更新事务调度新算法和基于反馈控制的架构去实现.通过仿真实验评估,算法可以从稳定性能和暂态性能保证系统的性能指标不会超过由数据库管理员事先提出的QoS规范.

Scheduling Algorithm of Update Transactions and Quality of Service Management in Real-time and Mobile Database Systems

The demand on mobile and real-time database application and service in distributed environment is becoming increasingly extensive,since the workload cannot be precisely predicted so that they can become overloaded possibly.Low bandwidth in mobile environment will lead to aborting or restarting for transactions because of competing for the limited system resources severely,resulting in damage or a catastrophe possibly.In this paper,we propose a novel performance metrics for example deadline miss ratio of tra...