Research On Transaction Processing In Broadcast Environment

The emergence of mobile computing to break the traditional database andcalculations are based on the assumptions of the wired network and fixed host.Combined with the rapid development of mobile communication technology andInternet technology gave birth to the movement of real-time database, but also hasgood application prospects for development.The rapid development of mobile computing technology allows users to accessdata anytime, anywhere is possible, but unlimited communication bandwidth, andpoor quality of communication, the mobile client also has a small memory, smallbattery capacity shortcomings. Therefore, in order to compensate for theseshortcomings and improve the mobile user concurrent access server data, have beenproposed a method of data broadcasting, to take the server initiative to push data tothe client.Study transactional concurrent execution process, the characteristics of thetraditional isolation level in the consistency of the data, found that this isolation leveldoes not fully guarantee data consistency, and to find a more simple and can ensuredata consistency method, and to prove the correctness analysis on the new isolationlevel transaction mortality rate and transaction blocking time is superior to thetraditional isolation level.Then study the UFO Broadcasting scheduling algorithm, frequent occurrenceof UFO algorithm on the server side update transaction, will make the server-sideBroadcasting frequent rollback, resulting in the client’s transaction have not beenable to be implemented. And then based on the analysis of these shortcomings, basedon the broadcasting server-side SBS algorithm and based on the mobile client CRSalgorithm and proved by experiment, SBS algorithm and CRS algorithm affairsmortality rate and average access time than the UFO algorithm significantlyimproved.Finally, taking into account the consistency of the mobile database transactionneeds diversified, and therefore need to consider not only the internal consistency ofthe database, but also consider the external consistency this end, the proposed thetransaction concurrency processing model in a broadcast environment. Thenanalyzed and discussed in terms of concurrent relationship and transactionprocessing, an advantage of this model in transaction processing.