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. 17, 2009
Filed:
Dec. 07, 2005
Surajit Chaudhuri, Redmond, WA (US);
Vivek R. Narasayya, Redmond, WA (US);
Rajeev Motwani, Palo Alto, CA (US);
Mayur D. Datar, Stanford, CA (US);
Surajit Chaudhuri, Redmond, WA (US);
Vivek R. Narasayya, Redmond, WA (US);
Rajeev Motwani, Palo Alto, CA (US);
Mayur D. Datar, Stanford, CA (US);
Microsoft Corporation, Redmond, WA (US);
Abstract
A method of estimating results of a database query, the results are estimated by performing a sampling of weighted tuples in a database based on a probability of usage of tuples required in executing a workload. A probability is associated with each tuple sampled. An aggregate is computed over values in each sampled tuple while multiplying by the inverses of the probabilities associated with each tuple sampled.