Method and apparatus for ranked join indices

Details Method and apparatus for ranked join indices Method and apparatus for ranked join indices

2007-02-19

2010-02-16

Vo, Tim T. (Department: 2168)

Data processing: database and file management or data structures

Database design

Data structure types

C707S793000, C707S793000, C707S793000, C707S793000

Reexamination Certificate

active

07664749

ABSTRACT:
A method and apparatus for ranked join indices includes a solution providing performance guarantees for top-k join queries over two relations, when preprocessing to construct a ranked join index for a specific join condition is permitted. The concepts of ranking join indices presented herein are also applicable in the case of a single relation. In this case, the concepts herein provide a solution to the top-k selection problem with monotone linear functions, having guaranteed worst case search performance for the case of two ranked attributes and arbitrary preference vectors.

REFERENCES:
patent: 6871201 (2005-03-01), Yu et al.
patent: 7185012 (2007-02-01), Koudas et al.
patent: 2003/0061213 (2003-03-01), Yu et al.
patent: 2004/0002973 (2004-01-01), Chaudhuri et al.
Nicolas Bruno, Surajit Chaudhuri, Lusi Gravano, “Top-K Selection Queries Over Relational Database: Mapping Strategies and Performance Evaluation”, Jun. 2, 2002, vol. 27, pp. 153-187.
Nicolas Bruno, Surajit Chaudhuri, Lusi Gravano,“Performance of Multiattribute Top-K Queries on Relational Systems”, 2000.

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