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Debug Database Connection Pool Exhaustion is a hard troubleshooting interview question covering troubleshooting, connection pool, saturation, resource exhaustion, latency debugging — the kind asked at FAANG (Facebook/Meta, Apple, Amazon, Netflix, Google) and AI-first companies like Anthropic, OpenAI, and Nvidia.
Your service is logging failures to acquire a database connection and timing out, under what looks like normal traffic. Thirty instances each hold a pool of twenty. Someone has already asked whether to raise the pool size. Answer that question, and find the cause.
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