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:
May. 12, 2015
Filed:
Nov. 27, 2012
International Business Machines Corporation, Armonk, NY (US);
Xin Ying Yang, Beijing, CN;
Chun Guang Zeng, Beijing, CN;
Xiang Zhou, Beijing, CN;
Ke Wei Wei, Beijing, CN;
International Business Machines Corporation, Armonk, NY (US);
Abstract
A computer program product and method for estimating a filter factor for access path optimization in a database are provided. The method includes extracting from a statement segment for database query a relation condition which defines the relationship between a variable and a first table. The method includes obtaining first statistics information according to the relation condition and the statistics information of the first table. The method includes extracting from the statement segment a filter condition which defines the relationship between the variable and a second table. The method includes obtaining second statistics information according to the filter condition and the statistics information of the second table, and according to the first statistics information and the second statistics information, estimating the filter factor of the filter condition. The method and computer program product according to the embodiments of the disclosure may more accurately estimate filter factor of the filter condition.