Types of Databases
Published July 23, 2025
By Sai Sree Ram Gundepudi
Types of Databases
There are several types of databases, each with its own use case and structure.
1. Relational Databases (RDBMS)
Data is stored in tables with rows and columns. Uses SQL for querying.
- Examples: Oracle, MySQL, PostgreSQL, SQL Server
2. NoSQL Databases
Stores unstructured or semi-structured data. Designed for scalability and flexibility.
- Types: Document (MongoDB), Key-Value (Redis), Column (Cassandra), Graph (Neo4j)
3. Hierarchical Databases
Data is stored in a tree-like structure. Example: IBM's IMS.
4. Network Databases
More flexible than hierarchical. Data can have many-to-many relationships.
Choosing the Right Type
Choose based on your app's scalability, structure, and consistency requirements.