File:SCO-VS-SS2PL.jpg

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Description

Read-write conflict: SCO Vs. SS2PL. Duration of transaction T2 is longer with SS2PL than with SCO. SS2PL delays write operation w2[x] of T2 until T1 commits, due to a lock on x by T1 following read operation r1[x]. If t time units are needed for transaction T2 after starting write operation w2[x] in order to reach ready state, than T2 commits t time units after T1 commits. However, SCO does not block w2[x], and T2 can commit immediately after T1 commits.

Source

Yoav Raz (1991): Locking Based Strict Commitment Ordering, or How to improve Concurrency in Locking Based Resource Managers, DEC-TR 844, December 1991. Yoav Raz (1995): The Principle of Commitment Ordering in yoavraz.googlepages.com

Date

1991

Author

Yoav Raz

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(Reusing this file)

https://sites.google.com/site/yoavraz2/home/wikipedia-copyright-permission

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Yoav Raz

Sep 25, 2011

This permission is extended to everybody, not only Wikipedia, under a similar condition that the origin of the material is indicated where it is used.

Yoav Raz

Oct 9 2015

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	Date/Time	Thumbnail	Dimensions	User	Comment
current	05:24, 5 January 2009		1,124 × 804 (39 KB)	Comps (talk \| contribs)	read-write conflict. SCO Vs. SS2PL. Duration of T2 is longer for SS2PL. From: Yoav Raz: "The Principle of Commitment Ordering"

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Commitment ordering

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