Remember when we talked about the core principles behind good microservices? Strong cohesion and loose coupling—with database integration, we lose both things. Database integration makes it easy for services to share data, but does nothing about sharing behavior. Our internal representation is exposed over the wire to our consumers, and it can be very difficult to avoid making breaking changes, which inevitably leads to a fear of any change at all. Avoid at (nearly) all costs.
Avoid Shared Database at (nearly) all costs.
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