Techniques for improved read-write concurrency

Details Techniques for improved read-write concurrency Techniques for improved read-write concurrency

2006-09-15

2009-10-06

Knoll, Clifford H (Department: 2111)

Electrical computers and digital data processing systems: input/

Access locking

C710S240000, C711S150000

Reexamination Certificate

active

07600063

ABSTRACT:
Techniques are provided for performing changes to a resource governed by a locking mechanism. An entity (such as a server instance in a database system cluster) requests permission to modify the resource. In response to the request, the entity receives a first lock on the resource, which grants permission to perform the change to the resource without making the change permanent. After receiving the first lock, the entity performs the change to a copy of the resource that resides in shared memory without making another copy of the resource. After performing the change and until receiving permission to make the change permanent, the entity prevents the change to the resource from becoming permanent. After performing the change, the entity receives a second lock on the resource, which grants the entity permission to make the change permanent. After receiving the second lock, the entity ceases to prevent the change to the resource from becoming permanent.

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Molesky, Lory D., et al., “Efficient Locking for Shared Memory Database Systems”, University of Massachusetts, Department of Computer Science, Lederle Graduate Research Center, partially supported by the National Science Foundation under grant IRI-9109210, written Mar. 1994, 28 pages.

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