This section describes how to create a DDM by either copying DDMs or creating DDMs directly from the field definitions in a database.
To create a DDM from an Adabas database
In the SYSDDM utility menu, enter the following:
In the Code field, enter either function code E
(Edit DDM) or G (Generate DDM from
Adabas FDT).
Leave the Name field
empty.
In the DBID and FNR fields,
enter the ID and file number of the database to be accessed by the DDM you want to
create (see also DDM
Specification).
For function E: An empty Edit DDM screen appears
where you can enter field definitions as described in Using the DDM Editor.
For function G: The DDM is generated automatically from the FDT (field
definition table) defined for the specified database and the Edit
DDM screen appears with all relevant field definitions.
Depending on the function used, on the Edit DDM screen either enter the field definitions required (see Using the DDM Editor) or modify the field definitions generated from the FDT.
When you are finished editing the DDM, check the source and press PF3.
The SYSDDM utility menu appears.
In the SYSDDM utility menu, enter the following:
In the Name field, enter a valid DDM name (see also
Object Naming Conventions in the Using Natural
documentation). For function G, the Name
field is preset to the default name
FILE-file-number where
file-number corresponds to the file number entered in the
FNR field.
In the Code field,
enter function code C (Catalog DDM).
The DDM is saved as a cataloged object in the specified database ID and system file. See also Cataloging a DDM.
To create a DDM from a VSAM file
In the SYSDDM utility menu, specify the following:
In the Code field, enter an E (see also Description of
Functions).
In the DDM Type
field, enter a V.
In the DBID and
FNR fields, enter the ID and file number of the database
assigned to VSAM, which is to be accessed by the DDM you want to create.
For
valid field entries, see DDM
Specification.
An empty Edit DDM screen appears.
Enter the field definitions as described in Using the DDM Editor.
Catalog the DDM as described in Catalog DDM in Natural for VSAM in the Database Management System Interfaces documentation.
To create a DDM from a Db2 table
For Db2, proceed as described in Generate DDM from an SQL Table in the Database Management System Interfaces documentation.
Catalog the DDM as described in Cataloging a DDM.
To copy single or multiple DDMs
In the SYSDDM utility menu, specify the following:
In the Code field, enter an M (see also Description of
Functions).
In the Name field,
enter the name of the DDM (or a range of names) to be copied.
In the
DBID and FNR fields, enter the database ID
and file number of the FDIC system file that contains the required
DDM(s).
For valid field entries, see DDM
Specification.
The Copy DDMs (via SYSMAIN) window appears.
Specify the source and target environments for the DDM(s) to be copied as described in Processing DDMs in the SYSMAIN Utility documentation.
If you want to copy DDMs between different system files and/or hardware platforms, see also Maintaining DDMs in Different Environments.