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Redis cheat sheet & developer notes

Redis cheat sheet and 4 curated developer notes — core concepts, patterns, and interview prep. Maintained by the DevRecall team.

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01 · Redis

Redis Interview Questions

Redis Interview Questions. Redis persistence options? RDB (snapshot): point-in-time snapshot, compact file, slower recovery but smaller. AOF (Append Only File): logs every write, durable but larger. Use both for best dur…

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02 · Redis

Interview Questions

Redis Interview Questions. Q: What is Redis and what is it used for?. Redis is an in-memory data structure store used as a cache, message broker, session store, rate limiter, and real-time leaderboard. All data is in RAM…

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03 · Redis

Data Structures & Commands

Data Structures & Commands. Strings. # Basic get/set SET name "Alice" GET name # "Alice" DEL name EXISTS name # 0 or 1 # With expiry SET session:abc "data" EX 3600 # expire in 3600 seconds SET session:abc "data" PX 60000…

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04 · Redis

Caching, Pub/Sub & Patterns

Caching, Pub/Sub & Patterns. Caching Patterns. // Cache-aside (lazy loading) — most common async function getUser(id) { const cacheKey = `user:${id}`; const cached = await redis.get(cacheKey); if (cached) return JSON.par…

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Concepts to know for Redis

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WebSockets vs SSE vs PollingThree ways to get server events into a browser, what each costs at the proxy and at scale, and a decision rule you can defend in a design interview.Intermediate·13 minCaching StrategiesCache-aside, read-through, write-through and write-behind, keeping a cache correct with TTLs, invalidation and versioned keys, and surviving stampedes.Intermediate·13 minIdempotency in APIsWhy retries create duplicate orders and double charges, which HTTP methods are safe to repeat, and how idempotency keys make any request safe to retry.Intermediate·11 minMessage Queues and At-Least-Once DeliveryWhy a broker can promise at-least-once but never exactly-once, queue versus log, and how idempotent consumers and the outbox make delivery effectively once.Intermediate·14 minRate LimitingToken bucket vs sliding window, where to enforce limits, how to keep counters correct across servers with Redis, and what a good 429 response looks like.Intermediate·12 minConsistent HashingWhy hash(key) mod N remaps everything when N changes, how a hash ring moves only 1/N of keys, what virtual nodes fix, and where rendezvous, jump and Maglev fit.Intermediate·12 min

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