Allocation And Scheduling Model Of Long Transaction For Data Papallel Exchange

There were more and more long transactions existed in the database operation process, and the structure became more and more complex. Traditional transaction processing model cannot be effectively used in the long transaction processing, and it's very difficult to research and realize the model, So it is particularly important to find a senior model, which can be applied to solve the problem of apply for the long transaction.This paper introduces the concepts, the ACID properties, characteristics and the development of transaction and several traditional business models, creates more effective long transaction processing and restoring technique, with research of various kinds of business models. And then introduces a long traditional model based on key task, drawing on the experience of key task of traditional transaction models. The model is based on the long transaction and DAG with data parallel exchange, which can process long transactions and make it more effective.This paper gives the simulate methods of models, the analysis processes, schedule and restore mechanism of long transaction process. This paper has integrated critical task, scheduling length into long transaction distribution and schedule model, besides, this paper put forward a method that cut the length of long transaction by duplicating critical task in parallel processing, which can raise speed of processing transactions, and reduce the rollback for failure of sub-transactions by adding conformity.