Database files are objects of type *FILE on the i5/OS system. They can be either physical or logical files and either externally described or program-described. You access database files by associating the file name with the device DISK in positions 36 through 42 of the file description specifications.
Database files can be created by IBM i Create File commands. For more information on describing and creating database files, refer to the DB2 Universal Database for iSeries section of the Database and File Systems category in the i5/OS Information Center at this Web site - http://www.ibm.com/systems/i/infocenter/.