Add or create a property to control system behavior.
Some properties in the system are not visible in an instance by default and must be
added to the System Property [sys_properties] table. If a feature requires the
addition of the property, you can add a system property.
Important: System properties store configuration information that rarely or
never changes. Each time you change or add a system property, the system flushes the
cache to keep all nodes in the cluster in synch. This cache flush has a very high
performance cost for one to ten minutes, which can potentially cause an outage if
done excessively. To prevent such outages, do not use a system property to store
configuration information that changes more than once or twice a month. Instead, use
a custom table to store regularly changing configuration information.