Should microservices share a database?
No. Each service should own its data. Sharing databases couples services and defeats the purpose. If you need data from another service, use an API or event, not a direct query.
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More FAQs in Monolith vs Microservices: Interview Questions and Answers
You incrementally replace parts of a monolith with new services. Old code is strangled (removed) as new services take over. Each step is shippable and reversible. It is the safe way to split a monolith.
Use the saga pattern: each service does its part and publishes an event. If a step fails, compensating events undo prior steps. You accept eventual consistency instead of ACID transactions.
A pattern that stops a service from calling a failing downstream service. It trips after N failures, fast-fails subsequent calls, and resets when the downstream recovers. It prevents cascading failures.
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