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Journal of Emerging Trends in Computing and Information Sciences >> Call for Papers Vol. 8 No. 3, March 2017

Journal of Emerging Trends in Computing and Information Sciences

Data Count Driven Concurrency Control Scheme with Performance Gain in Mobile Environments

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Author Mohammed Khaja Nizamuddin, Dr. Syed Abdul Sattar
ISSN 2079-8407
On Pages 106-112
Volume No. 2
Issue No. 2
Issue Date February 01, 2011
Publishing Date February 01, 2011
Keywords Absolute Validity Interval, Valid Period, semaphore, data count, Mobile Host, Fixed Host.


In a mobile computing environment, clients can access data irrespective of their physical location. Data is shared among multiple clients and can be updated by each client independently. This leads to inconsistency of the data. Due to limitations of mobile computing environment traditional techniques cannot be used. Several concurrency control techniques are proposed in literature to prevent data inconsistency. In this paper we first analyze the existing scheme of concurrency control without locking and justify its Performance limitations. A new scheme is proposed which adaptively set the validity period of the cached data items based on the number of data items required and current load of the database server. Experimental results show performance benefits, such as increase in average response time and decrease in waiting time of the transactions.  


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