Patent ID: 6108671
Filing Date: 2000-08-22
Classification: G06F,Y10S

Abstract:
A virtual database space system which is a database system using a computer system which has a main storage device and a secondary storage device and a virtual memory mechanism and transfers pages constituting data structures of fixed length between the secondary storage device and the main storage device while carrying out processing and when a page to be processed is not present in the main storage device reads that page from the secondary storage device to an empty page frame in the main storage device or to a page frame made free by a used page in the main storage device being written out to the secondary storage device, the virtual database space system comprising:a staging drive which is a nonvolatile auxiliary memory device larger than a virtual memory space formed by the virtual memory mechanism and can also be utilized as temporary database saving means at the time of a stoppage of the database system;means for when the database system is operating transferring pages of a database between the staging drive and the virtual memory space while carrying out processing and when a page to be processed is not present in the virtual memory space reading that page from the staging drive to a page frame of the virtual memory space; andmeans for corresponding a logical page number of a page in a virtual database space having a capacity larger than the virtual memory space to a page frame number of the virtual memory space.