Database Conversion Phase › Step 4: Subschema Preparation

Step 4: Subschema Preparation

To prepare the subschema, you perform these steps:

1. Compile the subschema using IDMSUBSC
2. Punch a subschema load module
3. Link edit the load module to a load library

IDMSUBSC Execution

The following figure shows the execution of the subschema compiler IDMSUBSC.

Input to IDMSUBSC

Input to IDMSUBSC is the subschema DDL created by the transparency generator.

Output from IDMSUBSC

Output from IDMSUBSC is:

• A source description of the subschema stored in the dictionary, including embedded warning and error messages issued by IDMSUBSC
• A subschema load module stored in the dictionary load area (DDLDCLOD), if the source input contains a GENERATE statement; the subschema in the dictionary load area is used by applications running under the central version

Note: For more information about the IDMSUBSC messages, see the CA IDMS Messages and Codes Guide.

Punching the Subschema Load Module

To punch the subschema load module, you submit a PUNCH LOAD MODULE statement to the DDDL compiler (IDMSDDDL).

Output from IDMSDDDL is an object deck. z/VSE users must be sure to save this output for use in step 7 of this conversion.

Linking the Subschema Load Module

Input to the linkage editor is the object deck produced by IDMSDDDL.

Output from the linkage editor is a load module in the load library. The subschema in the load library is used by applications running in local mode and the transparency loader.