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. 15, 2000
Filed:
Oct. 31, 1997
Andrew P Osborn, Bath, GB;
Paolo Fragapane, Bristol, GB;
Oracle Corporation, Redwood Shores, CA (US);
Abstract
A query performance prediction ('QPP') module is provided as part of an applications layer residing on respective user stations operating in conjunction with a centralized host computer system. The QPP module correlates estimated system cost information for a database query provided from a database management system associated with the computer system with statistics compiled from previous queries in order to estimate the system response time. In particular, an estimated CPU time for executing the present query is derived by extrapolating actual CPU times recorded for past queries having the closest estimated costs for accessing the same, or similar, tables and items in the database, using a form of a 'nearest neighbor' algorithm to match the present query to either identical or statistically closest past queries. The estimated CPU time for the present query is then multiplied by a current ratio of total elapsed times-to-CPU times for the system to produce an estimated total elapsed time for responding to the query.