Each MNC service contains an event queue which intermediately stores event messages until they are sent to the primary or secondary event database. The System device which is present in each MNC controls the behavior of these queues. By default the queue size is set to 500 messages. This should work perfectly for any system with a normal occurrence of events and a fast connection to the event database. If more events arrive in the queue before the are transmitted to the database, messages may be lost. If MNC service and event database running on the same server then there will never be a need for a larger queue.