Atomic storage of (meta)data
Relavance stores its data atomically and de-duplicates it. Both the concept and each value of each concept are only stored once (unique) in the associative database.
The associations between the concepts can be stored many times. Because there is an automated historic data collection and also because of data de-duplication.
Firstname "Jim" can be associated with Lastname "Smith" and "Brown".
The Firstname "Jim" is only stored once. The associations between Firstname and Lastname are stored multiple times
It saves up to 70% of storage.