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:
Sep. 08, 2009
Filed:
Apr. 18, 2006
Yoshio Suzuki, Kokubunji, JP;
Nobuo Kawamura, Atsugi, JP;
Satoru Watanabe, Kokubunji, JP;
Shinji Fujiwara, Sagamihara, JP;
Kazuhiko Mizuno, Sagamihara, JP;
Yoshio Suzuki, Kokubunji, JP;
Nobuo Kawamura, Atsugi, JP;
Satoru Watanabe, Kokubunji, JP;
Shinji Fujiwara, Sagamihara, JP;
Kazuhiko Mizuno, Sagamihara, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
Database synchronization processing is completed within a reasonable time, using narrow-band network that connects a primary site to a secondary site, to reduce the running cost of a system. A primary DBMS has a transaction executing unit for reading a primary DB of a primary storage system to update data as requested in an update request, and a write unit for writing the updated data in the primary storage system. The primary storage system includes an unnecessary information removing unit for overwriting an unused area in the written data successively with one of a preset character and a preset value. The primary storage system is connected, via a network, to a second storage system which stores a copy of the primary DB. The primary storage system is connected to the network via a network device which has a data compression unit for compressing a succession of the same value.