Implementation of a Time-Out Based Locking Algorithm for Mobile Transactions in XML Databases

With the remarkable growth of XML data over the Internet, different application areas have resulted in a growing number of XML databases, especially those involving web-based applications. In the current mobile computing scenario, the realization of “instant” information access over a mobile network is mostly geared towards web-based applications and it is high time to discuss concurrency control mechanism for mobile transactions in XML databases. We have proposed a new concurrency control algorithm for mobile XML databases with time-out based locking mechanism and addressing long-lived transactions [5]. In this paper, we present the implementation details along with improvements in the transaction manager. Using the proposed time-out based locking mechanism highly concurrent mobile transactions for XML documents can be achieved assuring serializability. Performance of the proposed algorithm implementation is simulated and the results are presented using the NOKIA Mobile Internet Toolkit.