Can a single database be used for all microservices in a system?

Using a single database for all microservices is technically possible, but it contradicts the fundamental principles of microservice architecture. Each microservice should have its own database to ensure independence, data isolation, and the ability to scale independently.

Advantages of a separate database for each microservice:

• Data isolation and fault tolerance: a failure in one service does not affect others.
• Independence in choosing data storage technologies tailored to specific tasks.
• Simplified deployment and updates without risking affecting other services.

A shared database can lead to:

• Management complexities of the data schema.
• Increased coupling of services.
• Problems with scaling and performance.

Therefore, it is recommended to use separate databases for each microservice.