Fujitsu Corporation

Toshihide Matsuda

Kazuhiro Taniguchi

Teruyuki Goto

Ryo Matsumura

Kenji Kawana

Yuuji Itou

A method manages a database system that includes a first database device whose memory content in a storage area is changed based on a command designated through a network from any business terminal device, and a second database device for storing the same memory content as the first database device as a backup. The method makes the first database device execute: creating and storing a logical log that correlates a command content with a memory content in the storage area every time the process is executed; creating a physical log that correlates a position information about the portion that is changed by the process, the memory content after changing by the process, and a class of the process every time the process is executed; and storing command specifying information that specifies the command corresponding to the physical log with the corresponding physical log every time each physical log is created.

Database system management method, database system, database device, and backup program

A control deviceat a main center, in order for an update carried out in an operation database device M to be also conducted in an operation database device S at a sub-center, generates and transmits a differential log fileto a control deviceat the sub-center. The control deviceat the sub-center, when receiving a differential log fileupdates the operation database device S on the basis of the log information in the differential log fileand accumulates the log information in a recovery log file. The log information of a recovery point set at the main center is incorporated into this recovery log file

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Kawasaki, Japan

Toshihide Matsuda