Which type of database should be considered when developing a new microservice?

The choice of database type for a new microservice depends on data requirements and functionality:

• If data is structured and integrity is important, it is better to use a relational database (e.g., PostgreSQL, MySQL).
• If high scalability and schema flexibility are needed, NoSQL databases can be chosen (e.g., MongoDB for documents, Redis for caching).
• For event-driven systems, databases supporting events and queues are suitable.

It is important that each microservice has its own independent database, which ensures isolation and simplifies scaling.

Example: a user management microservice may use a relational database for complex relationships, while a logging microservice might use NoSQL for fast storage of large volumes of data.