1. A storage system, comprising: means for being connected with a computer in which a database management system (DBMS) is operating; and information acquisition means for acquiring information on a data structure including a table, an index, and a log defined by a schema in said database management system, information on recording locations in said storage system in which database data managed by said database management system is classified according to a data structure defined by said schema, and information on databases managed by said database management system including a query execution plan of a query executed by said database management system.