Practice Redis data structures, caching strategies, and pub/sub patterns
Start Practicing NowMaster strings, hashes, lists, sets, sorted sets, and streams
Learn caching patterns, TTL strategies, and cache invalidation
Understand pub/sub, transactions, and Lua scripting
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Answer realistic Redis interview questions in a simulated environment
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Redis data structures and commands
Caching strategies and patterns
Pub/Sub messaging
Redis transactions and pipelining
Persistence (RDB and AOF)
Redis Cluster and Sentinel
A: Strings: counters, cache, session. Lists: queues, activity feeds (LPUSH/RPOP). Sets: unique items, tags, relationships. Sorted Sets: leaderboards, rate limiting. Hashes: objects, user profiles. Bitmaps: analytics, presence. HyperLogLog: cardinality estimation. Streams: event logs, message queues.
A: RDB: point-in-time snapshots, compact, faster restarts, potential data loss between snapshots. AOF: logs every write, better durability, larger files, slower restarts. Can use both. RDB for backups, AOF for durability. Configure fsync: always (slow, safe), everysec (balanced), no (fast, less safe).
A: In-memory storage (no disk I/O), single-threaded (no context switching, no locks), efficient data structures, pipelining (batch commands), multiplexing with I/O threads (Redis 6+). Single-threaded handles commands, I/O threads handle network. Simple protocol. Benchmarkable to hundreds of thousands ops/sec.
A: Redis Cluster enables horizontal scaling and high availability. Data automatically sharded across nodes using hash slots (16384 slots). Each master has replicas for HA. Client-side or proxy-based routing. Supports automatic failover. Trade-offs: no multi-key operations across slots, some complexity vs single instance.
Master common caching patterns: cache-aside, write-through, write-behind
Understand Redis expiration policies and eviction strategies
Know how to use Redis for rate limiting and distributed locking
Practice with pub/sub for real-time messaging
Understand Redis Sentinel for high availability in non-clustered setups
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