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:
Jan. 05, 2010
Filed:
Aug. 17, 2007
Patrick D. Bossman, Alexandria, VA (US);
Frank D. Bower, San Jose, CA (US);
John J. Campbell, Alton, GB;
You-chin Fuh, San Jose, CA (US);
Adarsh R. Pannu, San Jose, CA (US);
Terrence P. Purcell, New Berlin, IL (US);
Patrick D. Bossman, Alexandria, VA (US);
Frank D. Bower, San Jose, CA (US);
John J. Campbell, Alton, GB;
You-Chin Fuh, San Jose, CA (US);
Adarsh R. Pannu, San Jose, CA (US);
Terrence P. Purcell, New Berlin, IL (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
An apparatus, system, and method are disclosed for ensuring query execution plan stability in a database management system. The present invention binds a static database query to a new query execution plan (QEP) that produces the same result set as an original QEP bound to the static database query. Next, the present invention identifies one of the original QEP and the new QEP as a primary QEP and automatically collects execution statistics for the original QEP and the new QEP. Finally, the present invention automatically selects one of the original QEP and the new QEP as the primary QEP in response to completion of the automatic collection of execution statistics, the primary QEP selected such that the automatically selected QEP provides optimal execution performance based on performance criteria in comparison to the automatically unselected QEP, the primary QEP selected based on the execution statistics.