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:
Jan. 20, 2004
Filed:
Jan. 30, 2001
Robert F. Bretl, Portland, OR (US);
Ramachandran Venkatesh, Hillsboro, OR (US);
Gemstone Systems, Inc., Beaverton, OR (US);
Abstract
Software and a method selectively apply a pessimistic concurrency control for each database update that conflicts with another database update. The method includes determining whether a database update conflicts with another database update, applying an optimistic concurrency control for each database update that does not conflict with another database update, and applying a pessimistic concurrency control for each database update that does conflict with another database update. This provides a selective locking concurrency control that selectively applies transaction serialization and locking only when transaction conflicts are detected. As a result, the selective locking concurrency control avoids livelock transaction failures and provides deterministic transaction completion without the computational expense of a conventional pessimistic concurrency control.