JP2760794B

A method for processing a database for analyzing a query to the database from a user to determine an internal processing procedure therefor and executing it (910) comprises the steps of preparing single or a plurality of internal processing procedures based on analysis result of the query including a variable inputted in a preprocess step and statistical information of a database system (940), selecting an optimum one of the internal processing procedures based on a value substituted for the variable of the query in a query execution stage and the statistical information of the database system (970), and executing the query in accordance with the selected internal processing procedure (980).