If Adaptive Server shuts down, you should make sure that Monitor Server is shut down before restarting Adaptive Server. Monitor Server must be shut down to release resources, including the shared memory segment. Otherwise, the new Adaptive Server might not have enough resources to allocate a new shared memory segment, causing start-up to fail.
If the heartbeat mechanism is in effect, Monitor Server automatically detects the termination of the Adaptive Server within the specified heartbeat_interval and shuts itself down. The default heartbeat_interval is 120 seconds. See “Heartbeat interval” for more information.
Therefore, before attempting to restart Adaptive Server after a shutdown, you must either wait for the automatic shutdown of Monitor Server to occur or explicitly stop Monitor Server yourself.