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Memorial University - Electronic Theses and Dissertations 2
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Document Description
TitleA transaction execution model for mobile computing environments
AuthorMomin, Kaleem A., 1973-
DescriptionThesis (M.Sc.)--Memorial University of Newfoundland, 2000. Computer Science
Paginationviii, 106 leaves : ill., maps.
SubjectMobile computing; Transaction systems (Computer systems); Computer multitasking
Degree GrantorMemorial University of Newfoundland. Dept. of Computer Science
DisciplineComputer Science
NotesBibliography: leaves 97-106.
AbstractA mobile computing environment is characterized by limited execution capability at the mobile hosts, low bandwidth and the relatively high costs of wireless connection, and frequent disconnections and mobility of the mobile hosts. Such an environment naturally suggests an optimistic mode of execution, where the mobile host caches data and does the computation in disconnected mode and, on reconnection, the transaction is either committed or aborted based on the current values in the fixed network. -- We propose a new transaction execution model, based on optimistic concurrency control mechanism, which dynamically adjusts the transaction execution status at the mobile host to be consistent with the database state on the mobile support station. This increases the possibility of the transaction to commit successfully and hence makes the computation on the mobile host more meaningful. A detailed algorithm is presented and its adaptability to various aspects of the mobile environment discussed. -- We further strengthen the computation at the mobile host by facilitating partial guarantee against invalidation. This is accomplished by using a flexible concurrency control scheme which integrates optimistic and pessimistic approaches to access data items based on Read/Write and Write/Write-conflicts.
Resource TypeElectronic thesis or dissertation
FormatImage/jpeg; Application/pdf
SourcePaper copy kept in the Centre for Newfoundland Studies, Memorial University Libraries
Local Identifiera1476103
RightsThe author retains copyright ownership and moral rights in this thesis. Neither the thesis nor substantial extracts from it may be printed or otherwise reproduced without the author's permission.
CollectionElectronic Theses and Dissertations
Scanning StatusCompleted
PDF File(30.31 MB) --
CONTENTdm file name279183.cpd