Design of Efficient Dynamic Replica Control Algorithm for Periodic/Aperiodic Transactions in Distributed Real-Time Databases
Maintaining consistency between the actual state of the real-time object of the external environment and its images as reflected by all its replicas distributed over multiple nodes is one of the most important issue affecting the design of real-time database. Efficient replica control algorithm can contribute significantly to maintain this consistency. A replication control algorithm is presented for medium and large scale distributed database system by trying to maintain an independent consistency degree for each data object by presenting an adaptive dynamic replication control algorithm. It is based on some system factors to increase the chance of having an updated data item locally; avoiding remote access to meet timing constrains and achieves both availability and consistency for the replicated data as much as possible. A detailed simulation study shows that our algorithms can greatly improve the system performance compared to the systems either without replication or with full replication.
Keywords: Distributed database, Real-time databases, Real-time transaction, and Replica control algorithm.
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ABOUT THE AUTHORS
Hala Abdel Hameed
Lecturer Assistant with Faculty of Information Technology - Misr University for Science and Technology
Hazem El-Bakry
Hazem M. El-Bakry (Mansoura, EGYPT 20-9-1970) received B.Sc. degree in Electronics Engineering, and M.Sc. in Electrical Communication Engineering from the Faculty of Engineering, Mansoura University - Egypt, in 1992 and 1995 respectively. Dr. El-Bakry received Ph. D degree from University of Aizu - Japan in 2007. Currently, he is assistant professor at the Faculty of Computer Science and Information Systems - Mansoura University - Egypt. His research interests include neural networks, pattern recognition, image processing, biometrics, cooperative intelligent systems and electronic circuits. In these areas, he has published more than 75 papers in major international journals and 150 papers in refereed international conferences. Dr. El-Bakry has the United States Patent No. 20060098887, 2006. Furthermore, he is associate editor for journal of computer science and network security (IJCSNS) and journal of convergence in information technology (JCIT). In addition, is a referee for IEEE Transactions on Signal Processing, Journal of Applied Soft Computing, the International Journal of Machine Graphics & Vision, the International Journal of Computer Science and Network Security, Enformatika Journals, WSEAS Journals and many different international conferences organized by IEEE. Moreover, he has been awarded the Japanese Computer & Communication prize in April 2006 and the best paper prize in two conferences cited by ACM. He has also been awarded Mansoura university prize for scientific publication in 2010 and 2011. Dr. El-Bakry has been selected in who is who in Asia 2006 and BIC 100 educators in Africa 2008.
Torky Sultan
Professor with Faculty of Computer Science and Information Systems - Helwan University
Hala Abdel Hameed
Lecturer Assistant with Faculty of Information Technology - Misr University for Science and Technology
Hazem El-Bakry
Hazem M. El-Bakry (Mansoura, EGYPT 20-9-1970) received B.Sc. degree in Electronics Engineering, and M.Sc. in Electrical Communication Engineering from the Faculty of Engineering, Mansoura University - Egypt, in 1992 and 1995 respectively. Dr. El-Bakry received Ph. D degree from University of Aizu - Japan in 2007. Currently, he is assistant professor at the Faculty of Computer Science and Information Systems - Mansoura University - Egypt. His research interests include neural networks, pattern recognition, image processing, biometrics, cooperative intelligent systems and electronic circuits. In these areas, he has published more than 75 papers in major international journals and 150 papers in refereed international conferences. Dr. El-Bakry has the United States Patent No. 20060098887, 2006. Furthermore, he is associate editor for journal of computer science and network security (IJCSNS) and journal of convergence in information technology (JCIT). In addition, is a referee for IEEE Transactions on Signal Processing, Journal of Applied Soft Computing, the International Journal of Machine Graphics & Vision, the International Journal of Computer Science and Network Security, Enformatika Journals, WSEAS Journals and many different international conferences organized by IEEE. Moreover, he has been awarded the Japanese Computer & Communication prize in April 2006 and the best paper prize in two conferences cited by ACM. He has also been awarded Mansoura university prize for scientific publication in 2010 and 2011. Dr. El-Bakry has been selected in who is who in Asia 2006 and BIC 100 educators in Africa 2008.
Torky Sultan
Professor with Faculty of Computer Science and Information Systems - Helwan University
