A decoupled Service-Oriented Architecture is the blueprint for a microservices architecture. So microservices applications are designed and developed as a collection of loosely coupled services with private databases each per service. But then you may use different SQL or NoSQL databases for each service as per the kind of data you store and process within each service. That means you cannot simply apply local ACID transactions to retrieve data in
Modernizing Apps & Platforms for Telework with Amazon AWS, Kubernetes, Data Analytics, and Cloud Computing
Digitizing, Transforming, and Refactoring for Efficiency.