Choose DynamoDB vs MySQL for a backend
Quick Overview
This question evaluates a candidate's ability to reason about data modeling, access patterns, query complexity, consistency and transactional requirements, scalability, operational overhead, and cost when choosing between a key-value/NoSQL store and a relational database.
Salesforce
Mar 1, 2026, 12:00 AM
Software Engineer
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Software Engineering Fundamentals
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In a backend system, you must choose a primary database for a core service. Explain when you would choose a key-value/NoSQL store (e.g., DynamoDB-like) versus a relational database (e.g., MySQL-like).
Address:
- Data model and access patterns
- Query needs (ad-hoc queries, joins, aggregates)
- Consistency, transactions, and constraints
- Scalability, operational overhead, and cost
- Typical examples where each is the better choice
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