Research On Real-Time Replication And Synchronization In Mobile Database

With the development of human society,the modern society has become informaion period.With the development of mobile communication technology in the 1990s, many computing nodes continues the network connection while moving freely.This brings about the concept of "mobile computing" and "mobile database", which becomes a latest research area.Duplicate and syncroning technique is the key technique of mobile database, and is an important component of mobile database. Creating a cache can decrease the network delay of distant access and bandwith.Also it can provide load balance. Good cache control system can promote the efficiency of the cache and increase the probability of successful submission.This paper mainly do the research on the control and improve of the cache. The consistency of the client is an important research area in cache technology. Keeping the consistency of the client cache means keeping the consistency of client cache and server data. How to keep the syncronous updating of the client cache and the server data,how to keep the consistency of cache and server data after reconnection, how to increase the probability of successful submission of the client.An improved method is using related control, time control. Judge if the transaction commit is successful by the regularity and relativity of data. Use improved upload transaction queue, convert the data set and result set into inquire form by analysing sql sentence, so as to improve the output efficiency of dataset and resultset. Thus decrease the client load and the upload transaction queue. This increases the efficiency of upload link.