Method for managing a buffer pool referenced by batch and intera

Details Method for managing a buffer pool referenced by batch and intera Method for managing a buffer pool referenced by batch and intera

1982-06-24

1985-04-02

Thomas, James D.

Boots, shoes, and leggings

G06F 1300

Patent

active

045091196

ABSTRACT:
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 conditionally asynchronously prefetches 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.

REFERENCES:
patent: 3217298 (1965-11-01), Kilburn et al.
patent: 3618045 (1971-11-01), Campbell
patent: 4121286 (1978-10-01), Venton et al.
patent: 4320451 (1982-03-01), Bachman
IBM Information Management System (IMS/VS) Version 1.2., ISAM/OSAM Buffer Handler, Module Headers for Source Code Modules DFSDBH10, DFSDBH20, DFSDBH30 and DFSDBH40.
IBM Operating System (OS/VS2) SAM Logic Release 3.8, QSAM Routines, IBM Publication SY26-3832-1, Second Edition, Feb. 1975, pp. 15-53 and 178-181.

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