Recently non-relational databases known as NoSQL have become most popular for
handling a huge amount of data. Many organizations move from relational databases towards
NoSQL databases due to the growing popularity of cloud computing and big data. NoSQL
database is designed to handle unstructured data like documents, e-mails, and social media
efficiently. It uses distributed and cooperating devices to store and retrieve data. As a large
number of people storing sensitive data in NoSQL databases, security issues become critical
concerns. NoSQL has many advantages like scalability and availability, but it suffers from some
security issues like weak authorization mechanisms. This paper reviews the different models of
NoSQL databases and the security issues concerning these databases. In addition, we present the
existing access control models in different NoSQL databases.
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