RDBMS – every row is considered “high value”. In contrast, a lot of data items in a big data store is considered low-value.
The oracle nosql book refers to it as “variability of value”. The authors clearly think this is a major feature, a 4th “V” beside
Volume, Velocity and Variety-of-data-format.
As a result, data loss is often tolerable in big data (but never acceptable in RDBMS). Exceptions, IMHO:
* columnar DB
* Quartz, SecDB