Shandong Province Rural Credit Cooperative Data Off-site Backup System For The Design And Realization

Data backup in different areas is the core technology of disaster-prevention system. It plays an important role in consistency and reliability of data, which also affects system's expansibility. By valid data copy, transmitted data in local area and other city can be synchronous which can ensure that disaster-prevention centre in long range can take charge of operation promptly when local system is in trouble.A complete disaster-prevention system should contain constructions as following:1 , Local High-Availability system2, Data backup3 , High-Availability system in different areas4, Multiple-grade Wide Area Network backup5, Data copy in long rangeThe system designed and developed for Data-backup in different areas in this article ensures safety of business data in 16 city centres, which also makes basement on recovery of disaster in further. Disaster-recovery centre, named Province Centre saves business data of 16 city centers, which also backups running environments in 16 city centers. Once one city center has disaster, province center can take over business of the city, which can guarantee opening.During process of design and development of this system, I mainly complete system analysis, system general design and detailed design and so on.During the prophase of system design, I organize members of the project to do a lot of verification work, and analyze from many aspects such as business system, framework system, communication system, storage system, network system and so on. For example: do verification on transfer of recent net line in whole province, run 16 database instance at the same time, use communication middleware MQ to test whether data communication can ensure correctitude of data transmission; reliability verification of DB2 database log roll forward; daily and yearly data quantity and increasing amplitude of data and so on. By verification above, do enough survey on netenvironment of our province, hold first record and make good basement for system design in future.During stage of system design, I mainly take charge of design on general construction and hierarchy construction, dividing hierarchy of system function construction. In longitudinal, I divide hierarchy to operation system, communication, data base, application and etc. In cross direction, I adopt Client/Server construction, and do detailed design on DRC subsystem and DRS subsystem, do detailed functions on module, confirm inside and outside interface, and do general design on running environments. By system design above, it makes programming work modularization and concretion, and enhances the maneuverability and mensurability, makes complicated programming work simplified and standardized, guarantees the project development effectively.This system goes on in due form, which solves the fear of disturbance in the rear for network centre in each city, and also make promotion effect to safety and stabilization of business system.This system has advancement and innovation. Based on previous cold-copy and hot-copy, it makes original creation to conception of warm copy, which says building a backup center in one place far away, and transfer local data to the backup centre. By this way, once there's disaster in local area and data is destroyed, the lost data is only the part of journal that isn't archived. So we can decrease loss-rate of data.Make use of log rolling forward resume mode, and then carry out mode that copy many data in a backup center at the same time, keep away another way, initiate a way that one point to many points and copy outside city.In order to escape investment in repetition and save much money, 16 City Centers all around province build up one data backup center. It solves the problem that using much money to build up data backup center for each city. By this way, we can save much money and reduce operation cost to business network system in Rural Credit Cooperative all around province.First chapter in the article is preface which states importance of disaster-prevention system to Finance System , importance of data bac...