Using separate processing for read-only transactions in mobile environment

In mobile environment, the asymmetric communication between mobile clients and server is a distinguishing feature. The conventional query processing mechanisms cannot be directly applied. In this research, we investigate the approach of using separate processing for read-only transactions (ROTs). Since ROTs have a significant proportion in several applications like traffic information service, stock market and auction, using a separate algorithm to process ROTs from update transactions may reduce the degree of data contention. Thus, both the update and read-only transactions can be executed in a more efficient manner. Besides, using separate algorithm for ROTs allows higher degree of concurrency than standard concurrency control protocols. To require a group of ROTs to be conflict serializable with respect to the update transactions, a consistency requirement called Group Strong Consistency is defined. The performance of the protocol for Group Strong Consistency was examined through a series of simulation experiments. © Springer-Verlag Berlin Heidelberg 2003.