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:
Oct. 23, 2007
Filed:
Jan. 12, 2001
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
This disclosure describes leveraging workload information associated with executed database queries for estimating the result of a current database query. The workload information is analyzed to determine the usage of tuples in a database during query execution, such as how often a tuple is accessed and the number of different queries that accessed the tuple. A tuple is assigned a weight value that is based on the analyzed workload information. The particular tuples sampled for estimating a result for the current query is based on each tuple's weight value. The workload information may also be leveraged to generate an outlier index that identifies outlier tuples associated with the executed queries or that identifies outlier tuples associated with particular queries that are executed more frequently than other queries. The result for the current query can also be estimated using the sampled values along with the outlier tuples from the outlier index.