Do NoSQL databases have schemas?

Question

NoSQL databases do not have a schema in the same rigid way that relational databases have a schema. Each of the four main types of NoSQL database has an underlying structure that is used to store the data.

What is schema in NoSQL?

Database schemas are a key element in relational database systems. Prior to store data, the structure of that data must be specified in form of a database schema. Schemas not only restrict the structure of stored data, but that also assure that data are correctly read from database applications.

Are NoSQL databases schema less?

As a NoSQL database, MongoDB is considered schemaless because it does not require a rigid, pre-defined schema like a relational database. The database management system (DBMS) enforces a partial schema as data is written, explicitly listing collections and indexes.

Does MongoDB have a schema?

MongoDB has a flexible schema model, which means that some fields may contain different types of data from one document to the next. A field named address may contain strings and integers in some documents, objects in others, or some combination of all three.

How do I create a schema for a NoSQL database?

Schema design for NoSQL usually involves designing Keys, Indexes & Denormalization of attributes, all of which are inter-dependent on the application queries & workflows. The query requirements elicitation should include following specifications at a minimum: Business Data Entities.

Expert · Answer