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. 17, 2012
Filed:
Sep. 03, 2008
Xin Zhou, Monterey Park, CA (US);
Olli Pekka Kostamaa, Santa Monica, CA (US);
Xin Zhou, Monterey Park, CA (US);
Olli Pekka Kostamaa, Santa Monica, CA (US);
Teradata US, Inc., Dayton, OH (US);
Abstract
A system, method, and computer-readable medium for optimizing join operations in a parallel processing system are provided. A respective set of rows of a first table and a second table involved in a join operation are distributed to each of a plurality of processing modules. The join operation comprises a join on a first column of the first table and a second column of the second table. Each of the plurality of processing modules redistributes at least a portion of the rows of the first table distributed thereto substantially equally among the other processing modules and duplicates at least a portion of the rows of the second table distributed thereto among the plurality of processing modules. The disclosed optimization mechanisms provide for reduced spool space requirements for execution of the parallel join operation.