Question
Explain the concept of NoSQL databases. Compare key-value stores, columnfamily databases, and document databases with suitable examples and use cases.
Answer :
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NoSQL databases are non-relational database systems designed to store, manage, and process large volumes of structured, semi-structured, and unstructured data. The term NoSQL generally means “Not Only SQL,” indicating that these databases provide alternatives to the traditional relational model. NoSQL databases are particularly useful in Data Science and Big Data applications because they offer high scalability, flexible data models, fast data access, and the ability to handle distributed workloads. Unlike relational databases, which organize information into fixed tables with rows and columns, NoSQL databases can store data in formats such as key-value pairs, documents, columns, or graphs. Key-value stores are the simplest type of NoSQL database. They store information as a collection of unique keys associated with corresponding values. The value can be a string, number, object, or other data structure. The database retrieves data by using its key, making key-value stores extremely fast and efficient. Redis, Amazon DynamoDB, and Riak are examples of key-value databases. Redis is widely used for caching, session management,
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