The DDM= statement specifies
the NATURAL DDM. The name assigned to a NATURAL DDM references an
ADABAS file and its data fields. Note that a DDM is often referred
to as an ADABAS file, even though it is only a view of an actual ADABAS
file.
The name for a NATURAL
DDM can be a maximum of 32 characters. In a NATURAL DDM, data fields
can be assigned a DDM external name of 3 to 32 characters. DDMs are
stored in a system file that is simply another ADABAS file.
If you delete or rename
a
SAS/ACCESS descriptor file, you do not delete or rename the descriptor
file's underlying ADABAS file or NATURAL DDM. However, changing your
DDM can affect your descriptor files.
See Effects of Changing an ADABAS File or NATURAL DDM on Descriptor Files for more information
about how changing your DDM can affect your descriptor files.