System Design – Database Indexing
Practice system design interview questions focused on database indexing. Cover when to use indexes, trade-offs, and query performance. Answer questions and receive feedback on clarity and reasoning. Ideal for software engineer system design prep. First 2 questions are free with full feedback.
- Level Intermediate
- Questions 12
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Sample system design – database indexing interview questions
Preview 6 questions from this track in quiz order. In the full quiz you answer one at a time — type or speak — then get a score and feedback.
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What is a database index?
What a strong answer includes
Structure that speeds up lookups.
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How does an index improve query performance?
What a strong answer includes
Avoids full table scans.
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What are the costs of adding an index?
What a strong answer includes
Extra storage and slower writes.
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When should you add an index?
What a strong answer includes
Columns frequently filtered or joined.
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What is a composite index?
What a strong answer includes
Index on multiple columns.
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How do you choose column order in a composite index?
What a strong answer includes
Most selective or equality columns first.