文章基本信息

标题：Analytical Performance of Delay due to Bandwidth Variability in Concurrent Transactions Mixture
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作者：Ahmad aL-Qerem
期刊名称：International Journal of Computer and Information Technology
印刷版ISSN：2279-0764
出版年度：2014
卷号：3
期号：2
页码：464
出版社：International Journal of Computer and Information Technology
摘要：unpredictable propagation delay of mobile transaction delivery imposes a serious overhead on the execution performance of fixed host transactions. The mobility of clients in a mobile computing system also greatly affects the distribution of workload in the communication network. A shared data item that is locked by a mobile transaction could hinder operations of other fixed host transaction from being executed. The delay due to the bandwidth variability is highly affected the blocking of fixed transactions. Past studies have used locking protocols to maintain consistency of transaction regardless the difference of underling communication media that used by those transactions, however, no quantitative guideline has been given. In this paper, we provide analytical study of the delay due to bandwidth variability and proposed a heuristic lock request procedure which can be adopted by any locking protocol used for concurrent transactions mixture by dynamically reordering fixed transaction's operations therapy dec reasing the affect of delay due to bandwidth variability. Simulation results show that our solution effectively improve the concurrency protocol in mixture transactions environments.
关键词：transactions mixture; concurrency; bandwidth ; variability