When to Use a Hot Start

You can use a hot start to restart BDT:

After a normal shutdown.
After BDT terminates because of a failure of MVS or JES.
To load a new copy of BDT code if there have been recursive abends (the same module and displacement appear in message BDT3713 for each failure). You must terminate BDT with the RETURN command before doing a hot start for this purpose.

Hot start processing does not read the initialization stream, so system limits remain as they were set by the previous initialization.

The jobs that were active when BDT came down should restart. Jobs on the work queue are not affected.

All of the changes you made to jobs by issuing commands (such as MODIFY) will remain in effect.