Data processing: database and file management or data structures – Database design – Data structure types
Reexamination Certificate
2005-08-02
2005-08-02
Kindred, Alford W. (Department: 2163)
Data processing: database and file management or data structures
Database design
Data structure types
C707S793000, C707S793000, C707S793000
Reexamination Certificate
active
06925462
ABSTRACT:
The present invention relates to an optimization method in a database management system having the function of accessing external databases. Conventionally, whether functions contained in a query can be executed in external databases depends on a database management system having the functions, and therefore there has been a problem in that a database utilization method cannot apply to query optimization and query execution performance is reduced. To solve the above problem, a database management system having the function of accessing external databases is provided with an optimization step comprising the steps of: obtaining specification about whether to execute functions in a query in external databases; determining whether data referred to in a query is confined to one database; and determining whether a user specifies that the functions in the query are executed in external databases.
REFERENCES:
patent: 5590321 (1996-12-01), Lin et al.
patent: 5884321 (1999-03-01), Meffert
patent: 5968115 (1999-10-01), Trout
patent: 6-231181 (1994-08-01), None
patent: 7-141236 (1995-06-01), None
Hayashi Shigetoshi
Hirohata Kiyomi
Inohara Shigekazu
Nishikawa Norifumi
Shimazaki Koichi
Kindred Alford W.
Mattingly ,Stanger ,Malur & Brundidge, P.C.
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