The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 05, 2009
Filed:
Sep. 01, 2004
Yoshio Suzuki, Tokyo, JP;
Nobuo Kawamura, Atsugi, JP;
Kota Yamaguchi, Yamato, JP;
Satoru Watanabe, Tokyo, JP;
Shinji Fujiwara, Sagamihara, JP;
Yoshio Suzuki, Tokyo, JP;
Nobuo Kawamura, Atsugi, JP;
Kota Yamaguchi, Yamato, JP;
Satoru Watanabe, Tokyo, JP;
Shinji Fujiwara, Sagamihara, JP;
Hitachi Communication Technologies, Ltd., Tokyo, JP;
Abstract
A recovery of a secondary DB is executed by a log including a update difference of a primary DB, and a command is executed by adding the command to the log and analyzing the log by a secondary site. An operation command execution in the secondary site is applied to the DB having the consistency in the transaction at the same timing as a primary site or an intended timing, by transferring and executing the operation command via the log. In the case that the command is constituted by a snap shot generating instruction, a plurality of volumes of a mirror set forming a secondary storage apparatus are set to a pair state and the secondary DB is written in each of the volumes and synchronized, and the mirror set is set to a split state after the synchronization is finished, whereby a secondary DB is stored.