Efficient transaction processing in mobile broadcast environments

Pao Yue-kong Library Electronic Theses Database

Efficient transaction processing in mobile broadcast environments


Author: Liu, Kam-man
Title: Efficient transaction processing in mobile broadcast environments
Degree: M.Sc.
Year: 2001
Subject: Hong Kong Polytechnic University -- Dissertations
Mobile communication systems
Wireless communication systems
Wireless Application Protocol (Computer network protocol)
Real-time data processing
Department: Multi-disciplinary Studies
Dept. of Computing
Pages: vi, 117 leaves : ill. ; 30 cm
Language: English
InnoPac Record: http://library.polyu.edu.hk/record=b1668160
URI: http://theses.lib.polyu.edu.hk/handle/200/1436
Abstract: There are an increasing number of applications running in mobile environments, for example, stock trading, e-banking, sending and receiving email through WAP-enabled mobile phone. Some of these applications, such as stock trading systems, require the data retrieved to be both consistent and current. In conventional online transaction processing (OLTP) environment, the traditional serializability-based approach is employed to ensure transactional correctness. However, it is observed that such approach is not suitable for applications running in mobile environments, as this may involve a lot of communication overhead between the client and the server, but the bandwidth available for client to server communication is low and connection is unreliable. The objective of this thesis is to study appropriate transaction processing mechanism in a mobile environment where data is disseminated from server to clients through broadcast and at the same time, efficient concurrency control can be achieved. We then implement a set of APIs in the form of Java classes for database developers to develop applications running in such a mobile environment. To improve efficiency and data currency, the concurrency control mechanism adopted would be in a weaker form compared with the traditional correctness criteria of serializability and yet can produce correct results in almost all practical applications using point-to-point channels as an enhancement. As an illustration to demonstrate the feasibility and flexibility of our developed modules, we develop a mobile stock trading system utilizing these APIs. Finally, we conduct experiments and compare performance of applications based on this approach against the traditional approach, with positive results.

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