DCCTL compared to DB/DC
DCCTL and the TM part of a DB/DC environment are very similar.
Similarities include:
- Control region and dependent region initialization and termination.
- System definition and generation.
- Restart.
- Stage 1 input without removing the database definitions. You will need to make some changes to define a DCCTL system. See IMS Version 15.2 System Definition for more information about analyzing macros for system definition.
- Diagnosis.
Exit routines
You do not need to change your IMS exit routines or your existing IMS application programs that access other subsystem resources in a DCCTL environment. However, application programs that contain a mixture of calls that access other subsystems and IMS databases require changes. All DL/I calls that use a database PCB receive status code AD.
Automated operator transactions
Automated operator transactions are started the same way as IMS transactions are started. Automated operator transactions run as IMS application programs with the authority to issue a subset of DCCTL commands using DL⁄I calls.