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.
Data loss is often tolerable in big data, never acceptable in RDBMS.
* columnar DB
* Quartz, SecDB