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:
Jun. 07, 2011
Filed:
May. 06, 2004
Bhaskar Ghosh, Burlingame, CA (US);
Thierry Cruanes, Redwood City, CA (US);
Rushan Chen, Belmont, CA (US);
Shrikanth Shankar, Mountain View, CA (US);
Bhaskar Ghosh, Burlingame, CA (US);
Thierry Cruanes, Redwood City, CA (US);
Rushan Chen, Belmont, CA (US);
Shrikanth Shankar, Mountain View, CA (US);
Oracle International Corporation, Redwood Shores, CA (US);
Abstract
Techniques are provided for generating execution plans for, and executing, database statements that contain filter subqueries. Upon receiving a database statement that contains a filter subquery, the database server builds an execution plan that includes a filter operation that is fed by a subtree that corresponds to the subquery. The database server performs a cost analysis to determine whether (1) the filter operation should be parallelized, and (2) the subquery tree should be parallelized. Techniques are also described for generating plans and executing queries where (1) both the filter operation and the subquery subtree are parallelized, (2) the filter operation is parallelized but the subquery subtree operation is performed serially, and (3) the filter operation is performed serially but the subquery subtree operation is parallelized.