While the behavior offered with domain separation provides multi-tenancy support,
multi-tenancy is still contained within a single instance.
This means that some global properties, some global data, and some global processes are
shared across all domains. For example, the option to have the system Remember
me on the login page of the system is global and cannot be specified per
If you need complete and total separation of all system properties and do not require
global reporting or global processes, then separate instances is the best option.