Database management system, and query method and query execution program in the database management system
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United States of America Patent
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Aug 2, 2005
Grant Date -
Aug 22, 2002
app pub date -
Jan 10, 2002
filing date -
Feb 22, 2001
priority date (Note) -
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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.
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