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. 19, 2016
Filed:
Sep. 28, 2010
Steven A. Kirk, Chelmsford, MA (US);
David E. Walrath, Stow, MA (US);
Steven A. Kirk, Chelmsford, MA (US);
David E. Walrath, Stow, MA (US);
SYBASE. INC., Dublin, CA (US);
Abstract
Systems, methods and articles of manufacture for accelerating database queries containing bitmap-based conditions are described herein. An embodiment includes determining a bitmap, where the bitmap represents a set of rows that have satisfied one or more conjunctive conditions which preceded a conjunct that is a disjunction in a query expression and restricting evaluation of a disjunct within the disjunction to the set of rows represented by the bitmap. Another embodiment includes determining a satisfaction bitmap, where the bitmap represents the result of one or more preceding disjuncts in a disjunction within a query expression and restricting scope of evaluation of a disjunct to a set of rows that are not within the determined satisfaction bitmap. In this way, embodiments of the present invention enable the acceleration of queries containing disjunctions of conditions on a database table, as well as reduce the temporary resources consumed for such queries.