Method and apparatus for transforming queries

Details Method and apparatus for transforming queries Method and apparatus for transforming queries

1997-04-29

1999-10-05

Black, Thomas G.

Data processing: database and file management or data structures

Database design

Data structure types

707 3, 395708, 395709, G06F 1730

Patent

active

059639326

ABSTRACT:
In processing a query, a database server parses a string describing a query into a query representation. The query string is parsed again to generate a replica of the query representation. Various transformations can be applied to the replica in order to reduce the amount of processing for the query. In addition, transformations are applied to the query string before parsing again to produce a transformed query representation. A transformed query representation is selected for processing a query according to an estimated cost of using the query representation.

REFERENCES:
patent: 5301317 (1994-04-01), Lohman et al.
patent: 5590319 (1996-12-01), Cohen et al.
patent: 5724570 (1998-03-01), Zeller et al.
patent: 5742806 (1998-04-01), Reiner et al.
patent: 5761494 (1996-11-01), Smedley et al.

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