DATA MAINTENANCE SYSTEM AND METHOD OF DUAL SYSTEM

摘要

PROBLEM TO BE SOLVED: To provide a data maintenance system and method of dual-redundant system allowing an update of a database at any timing and allowing a synchronized maintenance between main group server and subgroup server in a dual- redundant. SOLUTION: In the system, a maintenance terminal 31 perform a maintenance operation with inputting update data to a database 15. An in-operation server 1 stores a result of the maintenance operation into a maintenance difference database 19 to update the database 15 by contents of the database 19 based on the database update request. The server 1 informs update information to an in-standby server 2. The server 2 updates the database 19 and a database 25 by the informed update information. The server 1 registers an update history into a database 10 of difference update history and a database 16 of update history.