The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 04, 2014
Filed:
Nov. 27, 2009
James L. Finnie, Toronto, CA;
Ronen Grosman, Thornhill, CA;
Matthew A. Huras, Ajax, CA;
Keriley K. Romanufa, Scarborough, CA;
Aamer Sachedina, Queensville, CA;
Garret F. Swart, Palo Alto, CA (US);
Xun Xue, Markham, CA;
Roger L. Q. Zheng, Richmond Hill, CA;
James L. Finnie, Toronto, CA;
Ronen Grosman, Thornhill, CA;
Matthew A. Huras, Ajax, CA;
Keriley K. Romanufa, Scarborough, CA;
Aamer Sachedina, Queensville, CA;
Garret F. Swart, Palo Alto, CA (US);
Xun Xue, Markham, CA;
Roger L. Q. Zheng, Richmond Hill, CA;
International Business Machines Corporation, Armonk, NY (US);
Abstract
Lock communications in a shared disk database system is reduced by several approaches: sending a single message to a lock manager for locks required for an operation and locks that will be required in the future, the operations may include row update, row delete, large scan, and row insert; performing an operation in two executions, where in a first execution locks required for the operation is determined without performing the operation, and in a second execution a single message is sent to a lock manager for the required locks and the operation is performed; in free space searching, sending a single message to a lock manager for row and page locks before a row insert is actually performed; and granting locks in an unfair manner.