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Broadcast of consistent data to read-only transactions from mobile clients

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3 Author(s)
Kam-Yiu Lam ; Dept. of Comput. Sci., City Univ. of Hong Kong, Kowloon, Hong Kong ; Mei-Wai Au ; Chan, E.

We study the inconsistency problem in data broadcast. While data items in a mobile computing system are being broadcast, update transactions may install new values for the data items. If the executions of update transactions and the broadcast of data items are interleaved without any control, it is possible that the mobile transactions, which are generated by mobile clients, may observe inconsistent data values. We propose a new algorithm, called Update-First with Order (UFO), for concurrency control among the mobile transactions and update transactions. The mobile transactions are assumed to be read-only. In the UFO algorithm, all the schedules among them are serializable. Two important properties of the UFO algorithm are that: (1) the mobile transactions do not need to set any lock before they read the data items from the “air”; and (2) its impact on the adopted broadcast algorithm, which has been shown to be an efficient method for data dissemination in mobile computing systems, is minimal

Published in:

Mobile Computing Systems and Applications, 1999. Proceedings. WMCSA '99. Second IEEE Workshop on

Date of Conference:

25-26 Feb 1999