If you start multiple brokers, you should also run the Watchdog process (PROWDOG).
PROWDOG enables you to restart a dead secondary broker without shutting down the database
server.
The Watchdog cleans up after improperly terminated processes. For example, it releases any
locks or shared-memory structures that those processes might hold.
If the Watchdog finds a process that is no longer active, it releases all the appropriate
record locks, backs out any live transactions, releases any shared-memory locks, and
closes the connection. If the lost process is a server, it disconnects and cleans up all
appropriate remote clients.
If the process was changing shared memory when it terminated, shared memory is in an
inconsistent state; the Watchdog forces a shutdown to protect the database.