Investigation Of Transaction Consistency On Distributed Data Everionment

Today, in the enterprises like Bank and Telecom, the application system on distributed data environment became more complex. Now to finish transactions, most of the systems have to run on the bases of different operation system and database system at one time, so the consistency is the important problem. To fund a platform for transaction stability, the X/open (now is open group) establish two-phase commit standard (XA standard). But on WLAN, there are some problems, that include (1) too many times communication (4way) and locking database longer (waste resources), resulting low efficiency; (2) data integrity caused by network. The paper researches on the handshake times and the lock of database, and designs a model that can apply to middle services system of bank.Firstly, paper introduces the Message middleware and the Transaction middleware, and discusses on the handshake times and the mechanism of transaction recovery. Now the popular transaction models are One Phase Commit (2WAY) and Two Phase Commit (4WAY). 2WAY is require/affirm course, but the probability of success is low and need transaction of correct. 4WAY which can resolve the problem of consistency has four times handshake, and base on the course of require / response, commit/affirm; but the times of handshake will affect the network and can't resolve all problem of failure transaction. By combining the...