Data types
String, list, hash, set, sorted set, stream, hyperloglog, bitmap, geo. Each with specific commands + complexity.
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Persistence
RDB: periodic snapshots. AOF: append-only log. Combine both for balance. RDB faster restart, AOF less data loss.
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Redis Cluster
16384 hash slots split across nodes. Replicas per master. Auto-failover. Client-side hash slot routing.