Maintenance of location-dependent views in mobile database environments
Akira Nakaaki, Hajime Shibata, Toru Murase, Masahiko Tsukamoto, Shojiro Nishio · Systems and Computers in Japan · 2000
In recent years, owing to the rapid development of wireless communications and computer hardware technologies, users can now utilize various services on networks without fixing their locations by utilizing portable terminals provided with wireless communication functions. In such environments, the demand for utilizing appropriate information according to the location of the users is increasing and processing methods for service realization are being studied. However, in situations involving continuous utilization of database information, these studies cannot be said to be sufficient. The authors have therefore proposed a mechanism called MobiView as a data management model for utilizing databases efficiently in the mobile environments [8]. By utilizing location-dependent views among the several proposed MobiViews, the user can easily utilize information according to his own location. In this paper, based on the distinctive features of this location-dependent view, we will consider several possible view maintenance techniques and carry out their quantitative comparison from the viewpoint of traffic. We will then show how the optimum technique will change according to parameters such as frequency of movement. © 2000 Scripta Technica, Syst Comp Jpn, 31(11): 70–81, 2000