Patent ID: 8001163

Claim:
A database management system that runs on a computer coupled to a storage system, wherein the storage system includes a plurality of storage devices, a power control module that performs power control of the plurality of storage devices, and an interface module that receives a power conservation instruction from the computer and transfers the power conservation instruction to the power control module, wherein the database management system comprises: an access module that performs access of data stored in a first type storage device among the plurality of storage devices and detects a fault relating to the access; a storage device specifying module that specifies a second type storage device, among the plurality of storage devices, that stores a backup corresponding to the data that are stored in the first type storage device when the access module detects a fault relating to the access of the data; and a power consumption control module that issues a power conservation cancellation instruction to cancel the power conservation for the specified second type storage device to the interface module of the storage system.