Fujitsu Corporation

Yasuki Yoshihashi

Tomoaki Mizoo

Ryo Matsumura

Toshirou Ono

Shoichi Kogiso

A primary system includes a first node and a second node that backs up the first node. A secondary system includes a third node and a fourth node that backs up the third node. The first node transmits data update information generated in response to a data update in the first node, to the second node and the third node. The fourth node determines a degree of progress in transactions indicated by data update information obtained through the second node and a degree of progress in transactions indicated by data update information obtained through the third node, identifies data update information indicating a further progressed transaction, and reflects the data update information in stored data of the fourth node.

Redundant system, redundancy method, and computer-readable recording medium

A database control method comprising a first main system processing in which, upon first data being stored in a second storage unit included in a second server communicably connected with the first server, the first data is stored in a first storage unit following instructions from a host computer, a first inhibiting processing in which, upon detecting an abnormality in communication with the second server, storing the first data in the first storage unit following instructions from a host computer is inhibited, a first query processing performing a first query to an arbitrating device arbitrating between the first server and the second server, and a processing executing or stopping the first main system processing in accordance with instructions from the arbitrating device.

Growing community of inventors

Kobe, Japan

Yasuki Yoshihashi