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:
Oct. 20, 2020
Filed:
Apr. 28, 2016
Parstream Gmbh, Cologne, DE;
Cisco Technology, Inc., San Jose, CA (US);
Abstract
Method and apparatus for performing a database query using a bitmap index in a data-base having a plurality of bitmap vectors, the method comprising the steps of: upon receipt of a query containing a selection condition, creating a filter bitmap based on the query input; performing a bitmap scan for the filter bitmap in order to determine at least one value of an existing matching data-base entry; determining a bitmap of the determined at least one value; creating a filtered bitmap by combining the filter bitmap with the bitmap of the determined at least one value; determining all entries in the database matching the filtered bitmap; sub-tracting the filtered bitmap from the filter bitmap, thus creating a new filter bitmap; repeating the steps, starting with the step of performing a bitmap scan based on the new filter bitmap, until the step of sub-tracting results in an empty bitmap.