Building database statistics across a join network using...

Details Building database statistics across a join network using... Building database statistics across a join network using...

2008-06-10

2008-06-10

Alam, Hosain T (Department: 2166)

Data processing: database and file management or data structures

Database design

Data structure types

C707S793000, C707S793000

Reexamination Certificate

active

07386538

ABSTRACT:
A method that builds column statistics utilizing at least one skew value. The column statistics built using skew values, instead of column statistics built only through random sampling, may be used to more accurately reflect skew values across join networks, and thus enable a query optimizer to better select an access plan that is optimal under current runtime conditions.

REFERENCES:
patent: 6263345 (2001-07-01), Farrar et al.
patent: 6272487 (2001-08-01), Beavin et al.
patent: 2003/0126127 (2003-07-01), Abdo
patent: 2005/0021287 (2005-01-01), Rjaibi
Peter J. Haas and Arun N. Swami, “Sampling-Based Selectivity Estimation for Joins Using Augmented Frequent Value Statistics”, Proceedings of the Eleventh International Conference on Data Engineering, pp. 522-531, IEEE, 1995.
Phillip B. Gibbons, “Distinct Sampling for Highly-Accurate Answers to Distinct Values Queries and Event Reports”, Proceedings of the 27th VLDB Conference, 2001.

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