Code Room
On-callMedium
Question
Every hour on the hour, your service has a brief latency spike and a load surge on the database. You suspect cache expiry. How do you confirm and fix it?
What a strong answer looks like
Stop the bleeding first (mitigate), then form hypotheses from real signals. Separate root cause from symptom, communicate status as you go, and close with what prevents a repeat.
Learn the concepts
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Run or narrate your approach, then ask the coach.