In the modern highly distributed computing system, a strict schema data store restricts the enterprise application to scale horizontally. With the evolution of the Big Data technologies, schema-free design becomes more popular around the industry. The Big Data industry refers to a term called NoSQL data store. In fact, we should not literally interpret the word NoSQL; actually, it is Not Only SQL.

As the name itself explains, schema-free is built on a data model/design without any strict schema. Data structure is highly runtime dynamic, that is, the data store schema is altered during the execution of the application. So, there is no need to define the upfront frozen data design in an enterprise software development cycle.