What is NoSQL databse?

NoSQL  or Not Only SQL database provides a mechanism for storage and retrival of data which is simpler in means other than the tabular relations used in relational databases.

Relational databases (RDBMS) rely on tables, columns, rows, or schemas to organize and retrieve data. In contrast, NoSQL databases do not rely on these structures and use more flexible data models.

Why NoSQL?

As RDBMS have increasingly failed to meet the performance, scalability, and flexibility needs that next-generation, data-intensive applications require, NoSQL databases have been adopted by mainstream enterprises. NoSQL is particularly useful for storing unstructured data, which is growing far more rapidly than structured data and does not fit the relational schemas of RDBMS. Common types of unstructured data include: user and session data; chat, messaging, and log data; time series data such as IoT and device data; and large objects such as video and images

Types of NoSQL databases:

  1. Key-Value Store – It has a Big Hash Table of keys & values {Example- Riak, Amazon S3 (Dynamo)}
  2. Document-based Store- It stores documents made up of tagged elements. {Example- CouchDB}
  3. Column-based Store- Each storage block contains data from only one column, {Example- HBase, Cassandra}
  4. Graph-based-A network database that uses edges and nodes to represent and store data. {Example- Neo4J}


Happy Learning … 🙂


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