Function
When set to true, this property ensures that database-wide properties cannot
be overridden by system-wide properties.
When this property is set to false, or not set, database-wide properties can
be overridden by system-wide properties (see "Precedence of properties" in the
Derby Developer's Guide).
This property ensures that a database's environment cannot be modified by the
environment in which it is booted.
This property can never be overridden by system properties.