System transition method, transition system and program for reducing transfer load and risk accompanying parallel operation of new and old system

摘要

Problem to be solved: to reduce the transfer load and the risk with the parallel operation of the new old system.Solution: in a 3-tier system having a web server, an AP server and a DB server, the web server comprises a current web server 10, a new web server 11, an AP server, an existing AP server 20, a new AP server 21, and a DB server are composed of the current DB server .And, in the transition stage from the current system to the new system, the current web server 10 will use only the current system for each customer and / or customer user, or to use only the new system or to select and use the new old system The new old use setting screen to be set is displayed.The current DB server 30 stores a combination selection table for setting the availability of switching between the current system and the new system for each customer and / or customer.Diagram