Data virtualization server, query processing method in data virtualization server, and query processing program

摘要

PROBLEM TO BE SOLVED: To obtain a data virtualization server that efficiently processes a query for the data set separately arranged in a plurality of data sources under a specific condition.SOLUTION: The present invention provides a data virtualization server for processing a query utilizing the data set separately arranged in a plurality of data sources 3, said server comprising: a virtual schema information storage unit 11 for storing virtual schema information; a query evaluation unit 12 for generating a prototype of a query posted to the data source 3 and a query processed in the data virtualization server; a divided information storage unit 13 for storing divided information relating to the dividing condition of the data set; a dividing condition application unit 14 for selecting or correcting the prototype of the query to each data source generated by the query evaluation unit 12 using the divided information; a data source information storage unit 15 for storing connection information to each data source 3; and a query execution unit 16 for generating each query that is executable in each data source 3, and, after posting to each data source, receiving and combining the results of the posting before transmitting.