Data management
In a microservices-based application, databases are isolated for each business capability and are managed by only one service at a time. Any request that needs access to the data managed by another service strictly uses the APIs provided by the service managing the database. This makes it possible to not only use the best database technology available to manage the business capability, but also to isolate the technology debt to the service managing it. However, it is recommended for the calling service to cache responses over time to avoid tight coupling with the target service and reduce the network overhead of each API call.
For example, a service managing user interests might use a graph database (https://en.wikipedia.org/wiki/Graph_database ...
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