Edge server replication is an effective solution to achieve high performance in dynamic Web applications, such as Web services. It can replicate the application logic and the data close to the clients to reduce the response latency and network traffic and to offload the servers. Many Web services involve frequent accesses to large-scale backend databases. Current database replication techniques are not directly applicable to edge server architectures. Most of the solutions do not consider the potentially limited disk sizes at the edge servers and the needs for them to serve many application sites. In this paper, we present a novel database replication approach, PSO-MP, for edge servers to address the problems. Experimental studies show that the PSO-MP approach significantly improves the performance of Web systems in terms of client response latency, Web application server offloading, and network bandwidth saving.
['Wei Hao', 'Jicheng Fu', 'I-Ling Yen', 'Zhonghang Xia']
A Novel PSO-MP Approach for Database Replications at Edge Servers