System and method of disaster recovery

Details System and method of disaster recovery System and method of disaster recovery

2007-05-21

2010-12-28

Kim, Charles (Department: 2161)

Data processing: database and file management or data structures

File or database maintenance

C707S610000, C707S640000, C707S661000

Reexamination Certificate

active

07860824

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).

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