Patent ID: 8732404

Claim:
A computer-implemented method of managing a buffer cache to perform page replacement by using reference time information regarding a time at which a page is referred to, the method comprising: loading a reference page to be referred to according to a request in a main memory; a first page selecting operation of, responsive to a space for loading the reference page being insufficient in the main memory: selecting at least one first page based on reference time information of pages loaded in the main memory, recording the selected first page in an extended buffer, and overwriting the reference page in a space where the selected first page has existed in the main memory; and a second page selecting operation of, responsive to a space for recording the selected first page being insufficient in the extended buffer, selecting at least one second page based on reference time information of pages recorded in the extended buffer, recording the selected second page in an auxiliary memory, and overwriting the reference page in a space where the selected second page has existed in the extended buffer.