Advances in communication and computation technologies and the recent marriage between the two allows users to have access to information sources via portable, mobile computing devices, and wireless connection. Broadcasting has been suggested as a possible solution for several limitations within this new environment. In order to limit the amount of energy consumed at the mobile unit, indexing can be considered as an energy-efficient solution within the broadcasting environment. In this work, we suggest possible allocation strategies of indexes along with their data objects (for an object-oriented database environment) on the broadcast channel. We conduct the timing analysis and simulation necessary to observe the effects of the allocation strategies on both the response time and energy consumption at the mobile clients.
Multidatabases offer practical means of managing information sharing from multiple preexisting heterogeneous databases. Furthermore, advances in computation and communication technologies allow users to access computer networks, using portable computing devices via a wireless connection, while mobile. By superimposing the mobile computing environment onto the multidatabase system, U new computing environment is attained. In this work, we concentrate on the effects of the mobilecomputing environment on query processing in multidatabases. Within the broadcasting environment, the organization of the data objects along a single air channel should follow the semantic links assumed within the objects' graph. Learning from our past experiences in objects' organization on conventional storage mediums (disks), we propose a scheme for organizing objects along a single sequential broadcast channel. The proposed schemes are simulated and analyzed.
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