Description

Mobile Ad hoc Network (MANET) consists of mobile nodes which is connected without any centralized administration. To maintain the effective data sharing, the data replication technique is needed. Due to the presence of the network partition, mobile nodes in one partition are not able to access the data hosted by nodes in the other partition. So the performance of data access is degraded. To deal with this problem, we apply data replication techniques. Existing data replication solutions in both wired and wireless networks aim at either reducing the query delay or improving the data availability, but not both. Data availability means where the availability ensures that the data can be successfully transmitted from the source to the destination in a timely manner. It is assumed that the application layer does not use encryption and expects the underlying network services to be secure. Data Replication is technique which enhances data availability by making copies of data items. Furthermore there are various issues arise in MANET which leads to problem in data replication. Replication allows better data sharing. It is a key approach for achieving high availability. It is suitable to improve the response time of the access requests, to distribute the load of processing of these requests on several servers and to avoid the overload of the routes of communication to a unique server. As both metrics are important for mobile nodes, we propose schemes to balance the trade-offs between data availability and query delay under different system settings and requirements.