| 摘要 |
PROBLEM TO BE SOLVED: To delete data without losing consistency in plural systems. SOLUTION: A dependent relation defining means 22 defines a dependent relation between systems. A dependence graph preparing means 21 receives parameter information such as effective date from an input means 1, analyzes the data dependent relation of data over systems on the basis of the dependent relation between systems stored in the dependent relation defining means 22, prepares a dependence graph and stores it in a dependence graph storage means 23. On the basis of the dependence graph stored in the dependence graph storage means 23, a deleting means 24 identifies data, which do not depend on data after the effective date, as deletion object data 31 to be deleted and deletes them from a storage device 31. |
