System/38-compatible database tools

The topic collection describes the System/38™-compatible data file utility (DFU/38) and the System/38-compatible query utility (Query/38).

• System/38-compatible data file utility (DFU/38)
  DFU/38 data entry applications can be created and used with DDM to work with remote files in the same manner as with local files.
• System/38-compatible query utility (Query/38)
  The System/38-compatible query utility (Query/38) can be used with DDM to create and use interactive or batch query applications.
• Non-iSeries or non-System/38 Query/38 example
  This example shows how to create a local file and use it to define the data that is to be queried in a non-iSeries™ or non-System/38 remote file.
• Query/38 output considerations for DDM
  Query/38 output to an existing non-iSeries™ or a non-System/38 target file is possible, but only under specific circumstances.
• Query/38 command considerations for DDM
  All the Query/38 commands can be used in applications that access local files or DDM files. And, wherever a local database file name can be specified on any of the Query/38 command parameters, a DDM file can also be specified, as long as any other limitations are met.
• Query/38 optimization for DDM
  Query/38 has an optimization function, but because it causes i5/OS™ database query to be used, the feature cannot be used when the query is performed against a remote file that is not on an iSeries™ server or a System/38.
• Existing Query/38 application considerations for DDM
  You should keep these considerations in mind for existing Query/38 applications.