System Design – Database Connection Pooling
Practice system design interview questions on database connection pooling. Cover why pools exist, sizing, and common issues. Answer questions and receive feedback. Ideal for software engineer system design prep. First 2 questions are free with full feedback.
- Level Intermediate
- Questions 12
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System Design – Database Connection Pooling interview questions
All 12 questions on this track, in the order you answer them. In the quiz you answer one at a time — type or speak — then get a score and feedback.
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What is a connection pool?
What a strong answer includes
Reuses database connections.
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Why use a connection pool?
What a strong answer includes
Avoids the cost of opening connections repeatedly.
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What happens when the pool is exhausted?
What a strong answer includes
Requests wait or fail.
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How do you size a connection pool?
What a strong answer includes
Based on concurrency and database limits.
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What is a connection leak?
What a strong answer includes
Connections not returned to the pool.
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How do you detect connection leaks?
What a strong answer includes
Monitors pool usage over time.
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What is the difference between min and max pool size?
What a strong answer includes
Baseline vs peak connections.
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How do timeouts interact with pools?
What a strong answer includes
Prevents indefinite waits.
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Can too large a pool hurt performance?
What a strong answer includes
Yes, overwhelms the database.
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How do you monitor a connection pool?
What a strong answer includes
Active, idle, and wait metrics.
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What is connection validation?
What a strong answer includes
Checks connections before use.
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Describe a pooling issue you would investigate.
What a strong answer includes
Symptoms and approach.