Concurrency control strategy to reduce frequent rollbacks in mobile environments

Abstract

In a mobile database environment, multiple mobile hosts may access the similar data items independent of their physical locations. This may result in inconsistency of data items. Several Concurrency Control techniques have been proposed to eliminate the inconsistency of data items. However because of the mobility and disconnections, the traditional concurrency control strategies are not suitable in mobile environments. The timeout based mechanisms proposed to reduce the starvation problem in mobile environments doesn't control the frequent rollbacks. In this paper we propose a preemptive dynamic timer adjustment strategy which achieves concurrency control and at the same time reduces the frequent rollbacks. Experimental results show better throughput, increase in commit rates and reduction in number of rollbacks as compared to the previous techniques. © 2009 IEEE.