Restart options after an abend

Starting Db2 after it abends is different from starting it after the STOP DB2 command is issued.

After the STOP DB2 command, Db2 finishes its work in an orderly way and takes a shutdown checkpoint before stopping. When Db2 is restarted, it uses information from the system checkpoint and recovery log to determine the system status at shutdown.

When a power failure occurs, Db2 abends without being able to finish its work or take a shutdown checkpoint. When Db2 is restarted after an abend, it refreshes its knowledge of its status at termination by using information on the recovery log, Db2 then notifies the operator of the status of various units of recovery.

You can indicate that you want Db2 to postpone some of the backout work that is traditionally performed during system restart. You can delay the backout of long-running units of recovery by using installation options LIMIT BACKOUT and BACKOUT DURATION on panel DSNTIPL.

Normally, the restart process resolves all inconsistent states. In some cases, you have to take specific steps to resolve inconsistencies. There are steps you can take to prepare for those actions. For example, you can limit the list of table spaces that are recovered automatically when Db2 is started.