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:
Feb. 16, 2021
Filed:
Apr. 29, 2015
Hewlett Packard Enterprise Development Lp, Houston, TX (US);
QiFan Chen, Austin, TX (US);
Choudur Lakshminarayan, Austin, TX (US);
MICRO FOCUS LLC, Santa Clara, CA (US);
Abstract
A technique includes determining a statistic for values associated with at least one column of a database based at least in part on a first sample of the values; and determining a degree of change in a second sample of the values relative to the first sample; and estimating a count of unique values for the column(s). The estimation of the count of unique values includes selectively incrementally updating the statistic using the second sample based at least in part on the determined degree of change; and basing estimation of the count at least in part on the updated statistic. The technique further includes processing a query to the database based at least in part on the count.