Fujitsu Corporation

Masayuki Kawashima

Minoru Inoue

Daisuke Fujita

Takahiro Takenaka

Yukihiro Hamada

Kazuo Ishihara

Toshihiko Masumoto

Naoyuki Kodama

Yoshihisa Takeda

Tsuyoshi Fujita

Kazuhiko Horiuchi

Katsutoshi Masatomi

A communication control system includes a first computer and a second computer, wherein the first computer includes a communication interface device and a first processor configured to control the communication interface device to transmit first data and first feature information indicating a feature of the first data to the second computer, and the second computer includes a memory that has a storage area allocated to store second data received from the first computer, and a second processor configured to determine whether the first feature information received from the first computer matches second feature information, indicating a feature of and calculated based on the second data stored in the storage area, and control the memory to release the storage area when the second feature information does not match the received first feature information.

Communication control system, method, and apparatus

A system is provided for duplication of an update database in a computer using partial data extraction. A copying module creates a copy database, including a partial copy, of the update database. A journal selecting module selects data, related to parts of the copy database in which the copy has finished, from an update data journal of the update database that is made when the copy database is being copied by the copying module. A duplication module updates the contents of the copy database created by the copying module with the contents of the update data journal selected by the journal selecting module.

On-line database duplication with incorporation of concurrent database

Growing community of inventors

Kako, Japan

Masayuki Kawashima