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:
Dec. 11, 2001
Filed:
Sep. 28, 1998
Christopher M. Farrar, Los Gatos, CA (US);
Harry A. Leslie, Los Altos, CA (US);
Pedro Celis, Austin, TX (US);
Diana L. Shak, San Jose, CA (US);
Jay H. Vaishnav, Cupertino, CA (US);
Michael J. Skarpelos, San Jose, CA (US);
Compaq, Cupertino, CA (US);
Abstract
A method and apparatus is disclosed for accurately estimating the cost of a database query, including the total computer resources used and estimated elapsed time for the production of a first row and last row of an operator involved in the query and/or the total resources used and elapsed time for returning the overall response to a database query. The method and apparatus accurately accounts for resources used and elapsed time associated with blocking operators, such as sorts and hash joins, which cannot produce a first row until they have completed their operations.