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:
Dec. 28, 2010
Filed:
May. 21, 2007
Yoshio Suzuki, Kokubunji, JP;
Nobuo Kawamura, Atsugi, JP;
Shinji Fujiwara, Sagamihara, JP;
Satoru Watanabe, Fuchu, JP;
Kazuhiko Mizuno, Sagamihara, JP;
Yoshio Suzuki, Kokubunji, JP;
Nobuo Kawamura, Atsugi, JP;
Shinji Fujiwara, Sagamihara, JP;
Satoru Watanabe, Fuchu, JP;
Kazuhiko Mizuno, Sagamihara, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
In a DR system, from the viewpoint of device cost, when search is not carried out, a physical application where log recovery is available by inexpensive DB appliance server is adopted. Further, a local mirror operation at a secondary site is not carried out. Furthermore, from the viewpoint of operation, by a log apply function unit, the tendencies of a log application and operations are monitored, and a search process is accepted according to the progress conditions of the log application. When the log application does not catch up sufficiently, the search is not accepted. Moreover, when a consistency guarantee of a secondary DB is made, not transactions in process at the moment of search instruction are undone (rolled back), but only transactions in process at the moment of a search instruction are redone (rolled forward).