Design And Realize The Model Of Transaction Scheduling In Real-time Database System

Real-time database is the database that it's data and transaction have explicit time limit, the correctness of system depends not only on the logical results, but also on the time of producing the logical results. With the hope of our industry should be more intelligent, the RTDBS has been the hot-topic.Real-time transaction scheduling is core module of all RTDB, it can effect the performance of RTDBS greatly. The aim of transaction scheduling is to ensure real-time credibility of data in the real-time database. The scheduling scheme of real-time transaction in RTDBS adopts the traditional priority-scheduling, concurrency control with alarm-scheduling to meet the need of timing limitation of real-time affair, it is more complex than traditional affair.The thesis begins with an overview of the characteristics and architecture of the RTDB. It sumes up the functions of RTDB. Then it briefly introduces the model of the real-time transaction from the fields of classification, priority strategies, concurrency controlling, activity state, scheduling state. After that, it provides us with a full description on the design of the real-time transaction processing form many aspects: description of transaction structures, related data structure, models of transaction processing, selection and definition of priority, selection of currency controlling and resolving of deadlock. In the end, it introduces the part of the realization of RTDBS-T1.0 which was based on EVC . It set up a good basic to continue this project's research and development.