Patent ID: 8041685
Filing Date: 2011-10-18
Classification: G06F,Y10S

Abstract:
1. A system configuration changing method in a shared-nothing database management system which comprises a plurality of CPU resources, a storage, and a network for connecting said CPU resources and said storage, wherein each of said plurality of CPU resources runs a database search program stored in a computer-readable storage medium, and each database search program being executable by a processor and functioning as a backend module for processing data, said method comprising the steps of: allocating physically independent data regions of the storage to respective backend modules by registering mapping information between the data regions and the backend modules; determining whether or not a CPU resource is to be removed from the shared-nothing database management system by monitoring the states of the plurality of CPU resources; in response to the determination that the CPU resource is to be removed, delegating a data region of the storage previously allocated to a backend module corresponding to the CPU resource to be removed to another backend module; and relocating data on the delegated data region of the storage to respective backend modules except the backend module corresponding to the CPU resource to be removed by changing the mapping information.