Restarting DBCTL

The startup process has two distinct phases: initialization and restart. You can use AUTO restart to do either a warm start or an emergency restart.

With an AUTO restart, (DBCTL startup parameter AUTO=Y), DBCTL decides whether warm start or emergency restart is required, based on the contents of the IMS restart data set (RDS), and proceeds with the restart without your needing to enter any further restart command.

If you need to enter your own restart command (for example, to perform a cold start), use a non-AUTO restart (DBCTL startup parameter AUTO=N). Non-AUTO restart stops after initialization, at which point you must manually enter a restart command.

AUTO=N will have been specified, or defaulted to, for the first startup of DBCTL. For subsequent restarts, use warm start or emergency restart, which means that you will need to change the parameter to AUTO=Y. For guidance on specifying AUTO=Y and AUTO=N, see System definition in IMS product documentation.

During restart processing, the log and RECON are opened.

The sections that follow state how you use these types of (re)start with DBCTL.