Changing the network definition in DB/DC and DCCTL environments

You can frequently change terminals that are connected to an IMS online system that have attendant buffer storage tuning. If you are introducing static VTAM® terminals into the system, you must regenerate the nucleus. (An online system definition is necessary if no VTAM support was previously defined.) At the same time, you can delete support for specific terminal types.

If you are introducing VTAM terminals and using ETO, it is not necessary to regenerate the nucleus. When you add an ETO terminal supported by the existing descriptors, IMS uses the appropriate ETO logon descriptor to define the terminal.

When considering deleting terminals, leaving the definitions in place might be more efficient if the terminal is physically removed and messages cannot be routed to that LTERM. You can make the deletions in a later definition change.

If you are adding MSC for the first time or adding physical links, you need an online system definition. If you are deleting an MSC MTM, TCP/IP, or VTAM connection, you need to regenerate only the nucleus. If you are changing link or system identification names, rebind the regenerated control blocks.