What is NoSQL?
NoSQL, which stands for “Not only SQL”, is a type of database that provides a mechanism for storage and retrieval of data that is modeled differently from the tabular relations used in relational databases. It is primarily used when handling a large amount of data where the data’s nature does not require a relational model. The data can be structured, but NoSQL is used when performance, scalability, and flexibility are more important than consistency.
Types of NoSQL Databases
There are four primary types of NoSQL databases, each with specific characteristics and uses:
- Document databases
- Graph stores
- Key-value stores
- Wide-column stores
Document databases pair each key with a complex data structure known as a document. Documents can contain many different key-value pairs, or key-array pairs, or even nested documents.
Graph stores are used to store information about networks, such as social connections. Graph stores include Neo4J and Giraph.
Key-value stores are the simplest NoSQL databases. Every single item in the database is stored as an attribute name, or key, together with its value. Examples of key-value stores are Riak and Voldemort.
Such as Cassandra and HBase, are optimized for queries over large datasets, and store columns of data together, instead of rows.
When to Use NoSQL?
NoSQL databases are an excellent choice when you have to analyze massive amounts of diverse data. Working with high volumes of data, low latency, and flexible data models are areas where NoSQL excels. It’s better to use NoSQL when you need scalability and proven technology for large amounts of data and speed.
Benefits of NoSQL
Some benefits of using NoSQL databases include:
- Ability to handle large volumes of structured, semi-structured, and unstructured data
- Agile development