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:
Feb. 24, 1998
Filed:
May. 13, 1996
Sumit Ganguly, Bhopal, IN;
Phillip B Gibbons, Westfield, NJ (US);
Yossi Matias, Potomac, MD (US);
Abraham Silberschatz, Summit, NJ (US);
Lucent Technologies Inc., Murray Hill, NJ (US);
Abstract
A method of estimating the query size of two databases T and R is disclosed. The method uses a threshold value to categorize the databases as dense or sparse. A dense-dense procedure is then applied to the two databases to produce a dense-dense estimate (A.sub.d). A sparse-any procedure that suppresses the dense data items coming from database T is performed which produces a first sparse-any estimate (A.sub.s1). A second sparse-any estimate (A.sub.s2) is then produced by suppressing the dense data items from database R. Ultimately a query size estimate is produced by combining the dense-dense estimate, the first sparse-any estimate and the second sparse-any estimate.