i5/OS™ DDM supports
access to nonkeyed physical files via the DDM direct file model.
The support has the following characteristics:
- Delete Capabilities: An iSeries™ direct
file is delete capable or nondelete capable. A nondelete capable file must
have an active default record.
- Supported Record Classes: An iSeries direct
file can have a fixed-length record (RECFIX) or variable-length record (RECVAR)
for storage. Once a non-iSeries source
server opens a file on the iSeries target
using variable-length record access, the iSeries target
continues to send and receive variable-length records on all subsequent I/O
operations.
Note: The iSeries server does
not support the concept of a direct file. i5/OS DDM
creates a direct file by creating a nonkeyed physical file and initializing
it, with deleted or active default records, to the maximum size requested.
No extensions to the file are allowed.