NoSQL databases are designed to address performance and scalability requirements of web based application which cannot be addressed by traditional relational databases. Due to their contrast in priorities and architecture to conventional relational databases using SQL, these databases are referred as "NoSQL" databases since they incorporate lots of additional features in addition to the features of conventional databases. The relational databases strongly follow the ACID (Atomicity, Consistency, Isolation, and Durability) properties while the NoSQL databases follow BASE (Basically Available, Soft State, Eventual consistency) principles. This survey paper is an analytical study on BASE features of some of NoSQL databases. (C) 2015 Elsevier B.V. All rights reserved.