Changing the DEDB AREA UOW structural definition using online change

Changing the DEDB AREA UOW structural definition requires the following of several procedural steps.

1. Use a specific customer-developed application program or original equipment manufacturer (OEM) utility to unload the area through existing system definitions.
2. DBDGEN, PSBGEN and ACBGEN to generate the application control blocks to implement the DEDB structural changes. The "UOW=(x,y)" parameter on the AREA DBDGEN macro statement defines the amount of space allocated to overflow within a DEDB UOW. The "ROOT=(nnn,mmm)" parameter on the AREA DBDGEN macro statement defines the amount of space allocated to Independent Overflow.
   The changed or new application control blocks must be built into the active IMS system's staging copy of ACBLIB, which is offline.
3. Run the online change utility, DFSUOCU0, to move the changed ACBLIB from the staging ACBLIB to the inactive (A or B) copy of the ACBLIB that is online to the active IMS system.
4. Enter the /DBR AREA command to remove access to the area from the active IMS system.
5. Enter and follow the online change command sequence for PREPARE processing for ACBLIB changes.
6. Enter and follow the online change command sequence for COMMIT/ABORT processing for ACBLIB changes.
7. Delete, define and initialize the area with the new system definitions.
8. Enter the /START AREA command to make the area accessible to the active IMS system.
9. Use a specific customer-developed application program or OEM utility to reload the DEDB through the changed system definitions for the DEDB.