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Title:	Fixed end timeout transaction management model for mobile environment
Authors:	Khder Moaiad Ahmad (P38275)
Supervisor:	Abdullah Mohd Zin, Prof. Dr.
Keywords:	Mobile computing.
Issue Date:	29-Jan-2015
Description:	Nowadays, the number of mobile applications is rapidly increasing in parallel to the number of mobile users in the mobile environment, which leads the changes in the design, and development of mobile environment applications. These changes raised important issues of mobile transactions management in mobile environment, which consists of fixed and mobile hosts (MH). Some fixed hosts can act as mobile support stations (MSS), which retain the communication between the mobile host and wired network. The mobile transactions should allow users to perform transaction from MHs at anytime and anywhere, and be able to manage and perform transactions in disconnected mode. Several transaction management models have been proposed. One of the prominent approaches is to predetermine the duration of transaction time' known as 'timeout' in which the MHs will be given a timeout from the MSS to complete their transactions. However, the MSS does not force the MHs to start at a specific time to perform the transaction. Consequently, it causes a long delay for the MSS to update and commit the transaction. This situation will cause negative effects on the database's atomicity, consistency, isolation, and durability (ACID) properties. In this thesis, a new transaction management model called Fixed End Timeout Transaction Management (FETOTM) Model is proposed. A new data allocation algorithm using weight factor, which aims for having fairness data distribution.FETOTM model was evaluated in three stages.Firstly, the proposed model is transformed into a mathematical formula.Secondly, an experimental simulation tools was developed and used to study performance of the proposed model against the state of art models(Transaction Commit on Timeout (TCOT) and Transaction Management Model for Mobile Databases (TMM-MDB)). Thirdly, the performance of proposed model is evaluated by developing a testbed prototype thatrepresented an implementation of the model in real working mobile environment. FETOTM model has reduced the time delay for the MSS in order to update and commit the database (Global commit) by constraining all the mobile hosts to complete their transactions before reaching the upper limit of the timeout (end timeout). The model was also able to manage the data allocation fairness in fixed and mobile network (host ratio, commit ratio). The simulation and testbed implementation results show that FETOTM is able to reduce the delay time by 42% and increase fairness 75%. With such a result, the FETOTM model contributes significantly to the improvement of quality transaction in mobile environment.,Ph.D
Pages:	268
Call Number:	QA76.59 .K484 2015
Publisher:	UKM, Bangi
Appears in Collections:	Faculty of Information Science and Technology / Fakulti Teknologi dan Sains Maklumat

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