Systems and methods for estimating the number of unique...

Details Systems and methods for estimating the number of unique... Systems and methods for estimating the number of unique...

2004-08-27

2008-09-23

Alam, Hosain T (Department: 2166)

Data processing: database and file management or data structures

Database design

Data structure types

Reexamination Certificate

active

07428550

ABSTRACT:
Systems and methods for estimating the number of unique attributes in a database are disclosed that can include generating a first estimate of the unique values of an attribute using a data sample; generating a second estimate of the unique values of the attribute in the data sample; forming a weighted first estimate; forming a weighted second estimate; and combining the weighted first and second estimates to form a final estimate.

REFERENCES:
patent: 6477534 (2002-11-01), Acharya et al.
patent: 2003/0084043 (2003-05-01), Acharya et al.
Peter J. Haas, Jeffrey F. Naughton, S. Seshadri, Lynne Stokes; “Sampling-Based Estimation of the Number of Distinct Values of an Attribute”, Proceedings of the 21st VLDB Conference, Zurich, Switzerland, 1995.

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