Mid-levelMid (3–6 yrs)SQLRedisMongoDBAmazonUberTwitter
Redis use cases
When is Redis the right tool, and when is it wrong?
Answers use simple, clear English.
Quick interview answer
Great for cache, session store, rate limits, leaderboards, locks, pub/sub ephemeral signals. Wrong as sole source of truth for critical durable business data unless you deliberately design persistence/HA and accept trade-offs. Always define TTL and stampede protection for caches.
Detailed answer
Great for cache, session store, rate limits, leaderboards, locks, pub/sub ephemeral signals. Wrong as sole source of truth for critical durable business data unless you deliberately design persistence/HA and accept trade-offs. Always define TTL and stampede protection for caches.
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