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ARPN Journal of Systems and Software >> Volume 6, Number 1, June 2016

ARPN Journal of Systems and Software

An Improved, Prioritized Concurrency Control Scheme with Performance Gain in Mobile Environments

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Author Mohammed Khaja Nizamuddin, Syed Abdul Sattar
ISSN 2222-9833
On Pages 34-40
Volume No. 1
Issue No. 1
Issue Date April 01, 2011
Publishing Date April 01, 2011
Keywords Absolute Validity Interval, Priority Value, Semaphore, Mobile Host, Fixed Host


In a mobile computing environment, clients can access shared data irrespective of their physical location and can be updated by each client independently. This leads to inconsistency of the data. 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 priority based scheme is proposed in which priority is given to the older transaction whenever conflict arises, there by decreasing transaction re-executions and current load of the database server. Experimental results show performance benefits such as increase in commit rate and decrease in re-execution of the transactions.  

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