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|Title: ||Currency guarantee for read-only transaction in broadcast data delivery environment|
|Authors: ||Mok, Yuen Man|
|Department: ||Department of Computer Science|
|Issue Date: ||2004|
|Supervisor: ||Dr. Lee C S. First Reader: Dr. Liu W Y. Second Reader: Dr. Chan Y K|
|Abstract: ||In recent years, due to the rapid developments of new wireless electronic
devices, the broadcast data dissemination has attracted considerable
concerns and attentions.
In broadcast data delivery environment, people are allowed to obtain any
information at any time and place. Moreover, there are lots of update
transactions at the server which update data values in the real-time database.
As a result, it is important tha t not only the data obtained by clients’ read-only
transactions are consistent, but also as recent as possible. It is because data
currency of the clients’ read-only transactions can reflect the performance of
the broadcast system. Currency guarantee specifies what update transactions
at the server are reflected by the data read by read-only transactions. In other
words, it simply means how new or update data values the clients can retrieve
for their read-only transactions.
In this project, currency guarantee on broadcast data delivery
environment is studied. A simulation model is built and various broadcasting
methods, which provide data consistency and different levels of currency, are
implemented. These are multiversioning method, invalidation-only method and
multiversioning with invalidation method. From the statistics obtained from the
model, the currency guarantee, advantages and limitations of different
transmission methods are compared and evaluated.|
|Appears in Collections:||Computer Science - Undergraduate Final Year Projects|
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