View Maintenance in Mobile Computing
Imaging passengers can access airline schedules and weather information while on the road, investors will access prices of financial instruments, sales people will access inventory and other corporate data, commuters will access traffic information. These will become a reality when online accesses to a large number of databases via wireless networks are make available to mobile users of portable computers. However, there are shortcomings. Online databases access becomes unavailable if user is out-of-range of the network. Due to limited uplink bandwidth, sending access requests from the mobile computer to the online databases become expensive. Sending messages is also a significant drain on the portable battery.
The solution to the above-mentioned problem is by maintaining a materialized view at the mobile computer. As the online databases changes, update will be done on this view through wireless data messages to improve access time to the view. To improve response time, the view should be materialize at the mobile computer. Furthermore, if cost is a major consideration, view will remain virtual at the mobile computer to keep cost down.
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