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Database management system, query method in database management system, and query execution program in database management system
Database management system, query method in database management system, and query execution program in database management system
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机译：数据库管理系统，数据库管理系统中的查询方法以及数据库管理系统中的查询执行程序
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摘要
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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