Supported DDM file models

iSeries™ DDM supports these DDM file models.

Alternate index file (ALTINDF)
Direct file (DIRFIL)
Directory file (DIRECTORY)
Keyed file (KEYFIL)
Sequential file (SEQFIL)
Stream file (STRFIL)

By using the above file models, the iSeries server supports access to the iSeries physical and logical files. The following table shows how DDM file models and iSeries data files correspond.

Table 1. iSeries data files
DDM file model	Corresponding iSeries data file
Alternate index file (ALTINDF)	Logical file with one format
Direct file (DIRFIL)	Nonkeyed physical file
Directory file (DIRECTORY)	Folder management services (FMS) folders or data management libraries
Keyed file (KEYFIL)	Keyed physical file
Sequential file (SEQFIL)	Nonkeyed physical file
Stream file (STRFIL)	Folder management services (FMS) document

Alternate Index File (ALTINDF)
i5/OS™ DDM supports access to a logical file by using the DDM alternate index file model.
Direct file (DIRFIL)
i5/OS™ DDM supports access to nonkeyed physical files via the DDM direct file model.
Directory file (DIRECTORY)
i5/OS™ DDM supports access to a folder management services folder or a data management library via the DDM directory file model. Folders can be created, opened, renamed, closed, or deleted. Libraries can be created, renamed, or deleted.
Keyed file (KEYFIL)
i5/OS™ DDM supports access to keyed physical files via the DDM keyed file model.
Sequential file (SEQFIL)
The iSeries server supports access to nonkeyed physical files via the DDM sequential file model.
Stream file (STRFIL)
i5/OS™ DDM supports access to a folder management services document by means of the DDM stream file model.

Parent topic: Subsets of DDM architecture supported by i5/OS DDM