Method and apparatus for managing a buffer pool referenced...

Details Method and apparatus for managing a buffer pool referenced... Method and apparatus for managing a buffer pool referenced...

G - Physics

06

F

354/241

G06F 13/00 (2006.01) G06F 9/44 (2006.01) G06F 9/46 (2006.01) G06F 11/14 (2006.01) G06F 17/30 (2006.01)

Patent

CA 1189979

ABSTRACT METHOD AND APPARATUS FOR MATCHING A BUFFER POOL REFERENCED BY BATCH AND INTERACTIVE PROCESS Apparatus and method for managing a buffer pool shared by sequential and random processes. A data base manager includes a buffer manager which: (1) maintains a normal least recently used (LRU) buffer chain and a sequential LRU buffer chain, the sequential LRU buffer chain being replicated on the normal LRU buffer chain; (2) places buffers released from a sequential process in both LRU buffer chains and buffers released from a random process only in the normal LRU buffer chain; and (3) responsive to a request for a buffer for a sequential process, steals the head buffer from the sequential LRU buffer chain, otherwise steals the head buffer from the normal LRU buffer chain. The buffer manager further includes means for conditionally asynchronously prefetching data set pages from the external storage device in response to a request for a data set page which is an integral multiple of a process defined prefetch quantity.

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