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:
Dec. 19, 2017
Filed:
Jul. 05, 2016
International Business Machines Corporation, Armonk, NY (US);
Andrei F. Lurie, San Jose, CA (US);
Terence P. Purcell, Springfield, IL (US);
Ying Zeng, Santa Clara, CA (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
In an index-only multi-index access in a database, when a query to be executed requires multiple indexes, a query optimizer determines whether columns are needed for a query result, subquery, or inner join result. If not, then the query result is resolved using qualified record identifiers (RIDs) from the multiple indexes without accessing the data pages. When the columns are needed and can be resolved using input values of the query, then the query result is resolved using the qualified RIDs from the multiple indexes and substituting column values with the input values of the query. When the columns are needed and cannot be resolved using the input values of the query, the query optimizer may store one or more index keys with its corresponding qualified RIDs from the multiple indexes and may resolve the query result using the stored index keys without accessing the data pages of the database.