What are different types of NoSQL databases?

What You'll Learn

• NoSQL categories
• When to use each type
• Popular databases

NoSQL Categories

1. Document Databases

// Stores JSON-like documents
{
  _id: 1,
  name: "John",
  orders: [{ product: "Book", price: 29.99 }]
}

Use for: Content management, catalogs, user profiles Examples: MongoDB, CouchDB, Firebase Firestore

2. Key-Value Stores

key: "user:1001"
value: { name: "John", email: "john@example.com" }

Use for: Caching, sessions, real-time data Examples: Redis, DynamoDB, Memcached

3. Column-Family (Wide Column)

Row Key: user1
  Column Family: profile
    name: "John"
    email: "john@example.com"
  Column Family: activity
    lastLogin: "2024-01-15"
    loginCount: 42

Use for: Time-series, analytics, large scale Examples: Cassandra, HBase, ScyllaDB

4. Graph Databases

(John)-[:FOLLOWS]->(Alice)
(John)-[:LIKES]->(Post)

Use for: Social networks, recommendations, fraud detection Examples: Neo4j, Amazon Neptune, ArangoDB

Comparison