Can microservices share same database?

Question

Yes, it's possible to integrate a database for microservices. You can create a single shared database with each service accessing data using local ACID transactions.

You are not likely to benefit from a Microservices architecture if all the services share the same database tables. This is because you are effectively tightly coupling the services. If a database table changes all the services will have to change.

Does each microservice have its own database?

The short answer is yes. However, before you start hyperventilating about the cost of all those extra Oracle licenses, lets first explore why it is essential to do this and then discuss what is meant by the term 'database'.

A basic principle of microservices is that each service manages its own data. Two services should not share a data store. Instead, each service is responsible for its own private data store, which other services cannot access directly.

Can microservices interact with each other?

Because microservices are distributed and microservices communicate with each other by inter-service communication on network level. Each microservice has its own instance and process. Therefore, services must interact using an inter-service communication protocols like HTTP, gRPC or message brokers AMQP protocol.

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