Why microservices have separate databases?

Question

Databases should be treated as private to each microservice. This helps you to achieve consistency across different services. Event-Driven Architecture is a common pattern to maintain data consistency across different services. 12 сент. 2018 г.

Why are there different databases in microservices?

It means that we can use different database technologies for different microservices. So one service may use an SQL database and another one a NoSQL database. That's feature allows using the most efficient database depending on the service requirements and functionality.

Should microservices have separate database?

As you described it very well above, each microservice needs to own it's DATA, which could be held within a dedicated database, within a dedicated schema (within a database), or even a set of dedicated tables (within a schema within a database).

Can microservices have same database?

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.

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