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Interview Preparation
Reliable APIs, services, databases, security, caching and distributed systems.
Practice role-specific questions with concise answers and key points.
Answer: An operation is idempotent when repeating the same request produces the same intended resulting state. PUT is commonly designed this way, while POST usually is not unless an idempotency mechanism is added.
Answer: An index is an auxiliary data structure that helps the database find rows efficiently without scanning the entire table, at the cost of additional storage and write overhead.
Answer: Combine authentication and authorization with rate limiting, input validation, quotas, request-size limits, monitoring and abuse detection. Apply controls at appropriate edge and application layers.