The invention relates to a system including a first database management system for managing a database (40) including data having a first data format and a second database management system for managing a database (50) including data having a second data format. The invention is a method for converting data transmitted between the first and second database management systems, the method including the steps of sending from the first to the second database management system a command containing data in a data format native to the first database management system; and at the second database management system, converting the data in the command into a data format native to the second database management system.