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:
Apr. 21, 1998
Filed:
Sep. 12, 1995
Thomas S Kavanagh, Boulder, CO (US);
Christopher W Beall, Boulder, CO (US);
William C Heiny, Arvada, CO (US);
John D Motycka, Evergreen, CO (US);
Samuel S Pendleton, Louisville, CO (US);
Brooke E Terpening, Golden, CO (US);
Kenneth A Traut, Boulder, CO (US);
CADIS, Inc., Boulder, CO (US);
Abstract
The present invention provides a method and apparatus for concurrency control in an object oriented database management system having a plurality of users accessing the system at the same time, and allowing editing of the database while other users are concurrently searching the database. The present invention may be advantageously used in a client/server architecture comprising a knowledge base client and a knowledge base server. In a preferred embodiment, the knowledge base server may include an object oriented lock manager, a dynamic class manager, a connection manager, a query manager, a handle manager, a units manager, a database manager, and a file manager. The concurrency control mechanism includes a lock holder table. The present invention provides a method and apparatus for providing concurrency control in an object oriented database managemant system using only three types of lock modes: a class share lock, a tree update lock, and a tree exclusive lock. In a preferred embodiment, a fourth type of lock mode may be provided: a tree share lock. The present invention provides a particularly advantageous concurrency control mechanism for an object oriented database management system that is read oriented.