EXECUTION OF DATABASE QUERY INCLUDING FILTERING

PROBLEM TO BE SOLVED: To provide a query processor capable of executing a query including filtering so as to decrease the number of times of fixing a page required for executing the query. SOLUTION: The query processing system has the query processor and a data manager. The query processor calls the data manager and executes data access for performing the query including a filtering operation. The data manager accesses data in the set of data and, before returning these data, call-back is started to the query processor. Then, it is judged whether the found data satisfy a filtering reference or not. When the data do not satisfy the filtering reference, the data manager seeks additional data in the set of data and it is not necessary to return the first found data to the query processor.