ScienceAsia 21 (1995): 323-329 |doi: 10.2306/scienceasia1513-1874.1995.21.323

TIME AND A DUPLICATED DATABASE IN A SHARABLE DATA SYSTEM

PATTARASINEE BHATTARAKOSOL^a, PETER NICKOLAS^b

ABSTRACT: In the present world, the need to share data over a heterogeneous distributed database system (HDDS) is widespread. The disconnection of links between a client and a server under the HDDS is an unavoidable situation. Implementation of duplicated databases has been proposed as a solution, but it is not cost effective when users are interested only in some pieces of data. Therefore, we propose here the implementation of a local database storing only the data of interest to a client, and the use of time values to control the maintenance and query processes of the local database. Results are proved which give theoretical justification to the proposal.

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a Department of Mathematics, Faculty of Science, Chulalongkorn University, Bangkok 10330, Thailand.
b Department of Computer Science, Faculty of Informatics, Wollongong University, Wollongong NSW 2522, Australia.

Received January 10, 1995