According to Oracle white paper on Oracle NoSQL database , NosSQL databases are sometimes characterized by the BASE acronym (Oracle, 2011).The base properties are often described when comparing the trade-offs between ACID properties of a centralized relational database to cluster-oriented NoSQL database (Brewer).

A computer cluster  is a single logical unit consisting of multiple computers  that are linked together. Relational databases were not designed to run on clusters. Cluster relational databases run on the concept of a shared disk sub-system. Demand for NoSQL databases is driven by the need to store data on clusters. when you have a cluster , you have lots of machines to spread the computation over but you have to consider that you have to transfer data across the nodes.

Describe the effect of cluster-oriented databases on ACID properties.

BASE acronym stands for BA- Basically Available, S-Soft state, E-Eventually consistent.

ACID acronym stands for A-Atomicity, C-Consistency, I-Isolation, D-Durability