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Microservice Architecture · interview question

Why should microservices avoid direct SQL joins across service databases?

Multiple choiceMediumchapter-18-curatedpremiummicroservice-architecturedatabase-per-service
Choose one answer
Answer and explanation

Correct answer

B. Cross-service joins create hidden coupling and block independent data ownership

Why

Direct joins across service databases tie schemas and release cycles together. Service boundaries work better when data is owned locally and other data is obtained through APIs or events.

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