Fujitsu Corporation

Teruyuki Goto

Kazuhiro Taniguchi

Toshihide Matsuda

Ryo Matsumura

Tomoaki Mizoo

Kenji Kawana

Yuuji Itou

Yoshiaki Teruta

When a switching unit of each of first DB servers receives a transaction-stop instruction request from a second DB server, the switching unit performs a transaction-stop instruction process. When a transaction processing unit of each of the first DB servers receives a transaction stop instruction from the switching unit, the transaction processing unit performs a transaction stop process. In the same manner, a transaction processing unit of the second DB server performs a transaction stop process. Each of the transaction processing units of the first and second DB servers determines whether a transaction is to be stopped depending on a processing attribute and a processing state of an SQL included in the transaction and then performs the transaction stop process depending on a determination result of the processing attribute and the processing state.

Switching program, switching method and duplex system

An active device attaches a sequential number representing a notification number to update record information for recording an event that data is stored, then notifies a preliminary device of the update record information, and, accumulates the update record information. The active device again makes the notification. The preliminary device monitors the update record information of which the active device notifies and detects, based on regularity of the sequential numbers attached to the respective pieces of update record information, missing reception of the update record information. When detecting the missing reception of the update record information, the preliminary device makes a request for retransmitting the update record information and notifies of information about matching data stored in a first storage unit of the active device with data stored in a second storage unit of the preliminary device.

Information management system

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

Growing community of inventors

Kawasaki, Japan

Teruyuki Goto