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. 12, 2012
Filed:
Dec. 04, 2008
Ning Zhang, Palo Alto, CA (US);
Sam Idicula, Santa Clara, CA (US);
Sivasankaran Chandrasekar, Menlo Park, CA (US);
Nipun Agarwal, Santa Clara, CA (US);
Ning Zhang, Palo Alto, CA (US);
Sam Idicula, Santa Clara, CA (US);
Sivasankaran Chandrasekar, Menlo Park, CA (US);
Nipun Agarwal, Santa Clara, CA (US);
Oracle International Corporation, Redwood Shores, CA (US);
Abstract
Techniques are provided for estimating the cardinality of a virtual result table that is produced by executing path-based table functions within a query, such as the XMLTABLE function. Some path-based table functions apply a path expression to input from a base table of XML documents to select rows to produce the result table. Path statistics are collected for the path expressions for the base table. The path statistics are used to estimate the cardinalities of the result table. The estimated cardinality of the result table is useful for estimating costs of query execution plans that are generated for the query.