On Relocation Decision Policies of Mobile Databases

BUDIARTO  Kaname HARUMOTO  Masahiko TSUKAMOTO  Shojiro NISHIO  

Publication
IEICE TRANSACTIONS on Information and Systems   Vol.E82-D    No.2    pp.412-421
Publication Date: 1999/02/25
Online ISSN: 
DOI: 
Print ISSN: 0916-8532
Type of Manuscript: PAPER
Category: Databases
Keyword: 
mobile computing,  database,  replication,  evaluation,  

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Summary: 
Recently, mobile computing has received much attention from database community. Sharing information among mobile users is one of the most challenging issues in mobile computing due to user mobility. Replication is a promising technique to this issue. However, adopting replication into mobile computing is a non-trivial task, since we are still facing other problems such as the lack in disk capacity and wireless network bandwidth used by mobile users. We have proposed a dynamic replica allocation strategy called User Majority Replica Allocation (UMRA) that is well suited to the modern architecture of mobile computing environment while avoiding such problems mentioned above. In this paper, we propose two relocation decision policies for UMRA and we provide a cost analysis for them. We also provide a cost analysis for another replica allocation strategy called Static Replica Allocation (SRA) for a comparison purpose.