There is a lot of unstructured and semistructured data produced by applications such as social media programs, the Internet of Things (IoT), and logs, where you have a very dynamic schema. These data types may have different schemas for each set of records. Storing this data in a relational database could be a very tedious task. Everything has to be filed into a fixed schema, which can either cause lots of null values or data loss. The nonrelational or NoSQL database provides you with the flexibility to store such data without worrying about a fixed schema. Each record can have a variable number of columns and can be stored in the same table.
NoSQL databases can store a large amount of data and provide low-access latency. They are easy to scale by adding more nodes when required and can support horizontal scaling out of the box. They can be an excellent choice to store user session data and can make your application stateless to achieve horizontal scaling...