Abstract: An apparatus for adjusting the size of data as it is exchanged between a computer program and a database in situations when the computer program and the database use different formats for the data which is to be exchanged. A datum transfer direction determinator determines whether the datum which has the incompatible data format is being transferred to the database or to the computer program. The determinator examines the database operation issued from the computer program to determine whether the computer program is to receive the datum as in the case of a retrieve database operation or the database is to receive the data as in the case of an insert database operation. Based upon the datum direction and a predetermined adjustment value, a data size adjuster then adjusts the size of the data to be compatible with the data size used by the intended recipient of the data.