What database do you use for microservices?

Relational databases You’ll have to start building microservices with what you have – a relational database, such as DB2, MS SQL Server, MySQL, PostgreSQL, and gradually split it into several small services. On top of that, you can use a relational database in microservices if you apply polyglot persistence.

Should microservices have separate databases?

Fundamentals. By definition, microservices should be loosely coupled, scalable, and independent in terms of development and deployment. Therefore, the database per service is a preferred approach as it perfectly meets those requirements.

Is MongoDB good for Microservices?

MongoDB is well suited for a microservices architecture with its ability to provide a flexible schema, redundancy, automation, and scalability.

Does Microservices use same database?

In the shared-database-per-service pattern, the same database is shared by several microservices. This pattern does not reduce dependencies between development teams, and introduces runtime coupling because all microservices share the same database. …

How do microservices store data?

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.

Should each Microservice have its own database server?

You do not need to provision a database server for each service. For example, if you are using a relational database then the options are: Private-tables-per-service – each service owns a set of tables that must only be accessed by that service.

How do I share data between microservices?

Another way to share data is to share a data store. Services can share a relational database, NoSQL store, or another data storage service. One or more services publish the data to the database, and other services consume it when required. Most databases and data stores provide data via request/response mechanisms.

What kind of database should I use for my microservice?

For some services, a relational database is the best choice. Other services might need a NoSQL database such as MongoDB, which is good at storing complex, unstructured data, or Neo4J, which is designed to efficiently store and query graph data. Keep each microservice’s persistent data private to that service and accessible only via its API.

How do I keep persistent data private in a microservice?

Keep each microservice’s persistent data private to that service and accessible only via its API. A service’s transactions only involve its database. The following diagram shows the structure of this pattern. The service’s database is effectively part of the implementation of that service. It cannot be accessed directly by other services.

How does the Order persist in a microservice?

Here’s how it persists orders. Every order is stored as a sequence of events, and the customer store subscribes to them. 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.

Does sharing resources between two microservices violate microservices architecture?

So a service does not violate the microservice architecture just because you let two of them share some resource – it violates it when sharing the resource becomes mandatory. It doesn’t matter. The only scenario where it could theoretically matter is if one service needs to migrate to a different versions of the database.