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. 25, 2011
Filed:
Sep. 30, 2005
Allison Waingold, Sunnyvale, CA (US);
Rafi Ahmed, Fremont, CA (US);
Bhaskar Ghosh, Palo Alto, CA (US);
Dinesh Das, Redwood City, CA (US);
Mohamed Zait, San Jose, CA (US);
Allison Waingold, Sunnyvale, CA (US);
Rafi Ahmed, Fremont, CA (US);
Bhaskar Ghosh, Palo Alto, CA (US);
Dinesh Das, Redwood City, CA (US);
Mohamed Zait, San Jose, CA (US);
Oracle International Corporation, Redwood Shores, CA (US);
Abstract
Techniques are provided for delaying evaluation of expensive expressions in a query. Expensive expressions in the query are established by cost information or by looking up a list of known expensive expressions for a match. After an execution plan is determined by using the early evaluation technique, one or more equivalent execution plans is established. The one or more equivalent execution plans may include both a type of execution plans that delay evaluation of expensive expressions and a type of execution plans that do not. In addition, the one or more equivalent execution plans may include both parallelized and non-parallelized alternatives to the execution plan identified by the early evaluation technique. Finally, based on a set of criteria, which may include comparing cost information among all the equivalent execution plans generated thus far, the best execution plan is chosen for the query.