Concurrency control and consistency maintenance with DTD and SSM for weakly connected environments

In mobile computing environment, mobile clients are concurrently accessing the database server. The broadcast-based mobile data dissemination poses new challenging issues on data consistency of mobile transaction processing due to frequent disconnection from the network. In this paper, we design smart server model and we control the concurrency of mobile transactions to provide consistent data to the mobile clients that may be often disconnected from the network. We also design dynamic transmission disks (DTD) which are broadcast to satisfy two types of users: frequently accessed data items user, rarely accessed data item users taking into consideration of frequency of accession and also frequency of updates. And also we prioritize the reads and writes of mobile clients to maintain consistency of the data provided to the mobile clients.