Method of and an apparatus for shortening a lock period of a sha

Details Method of and an apparatus for shortening a lock period of a sha Method of and an apparatus for shortening a lock period of a sha

1995-11-27

1998-02-03

Black, Thomas G.

G06F 1730

Patent

active

057154473

ABSTRACT:
A method of shortening a lock period of a shared buffer in a data processing system includes a step of securing a copy memory used when nonvolatilizing the contents of the shared buffer, a step of temporarily locking the shared buffer, a step of copying the contents of the shared buffer into the copy memory, a step of unlocking the shared buffer after the completion of the copying step and a step of nonvolatilizing the contents of the copy memory. The shared buffer is locked before the contents thereof are copied into the copy memory and is unlocked after the completion of the copying step and before the nonvolatilization of the contents of the copy memory.

REFERENCES:
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patent: 5386554 (1995-01-01), Nozaki
Kooth et al "Database System Concepts 2/e" McGraw-Hill pp. 365-374, 1991, 1986.
Date, C.J., An Introduction to Database Systems, vol. II, Jul. 1985, Addison-Wesley, Reading, MA, pp. 9-17.
IBM Technical Disclosure Bulletin, vol. 29, No. 5, Oct. 1986, New York, NY, "Update Merging Mechanism for Shared Memory in Multi-Systems," pp. 2328-2331.
IBM Technical Disclosure Bulletin, vol. 33, No. 3B, Aug. 1990, New York, NY, "Weak Locks with Two-Level Locking Multi-Computer System Protocol to Reduce Lock-Holding Time," pp. 287-288.
Mohan, C., "Recovery and Coherency-Control Protocols for Fast Intersystem Page Transfer and Fine-Granularity Locking in a Share Disks Transaction Environment," IBM Research Report, RJ 8017, Mar. 15, 1991, Yorktown Heights, NY, pp. 1-31.

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