Redis: RAM speed
Conventional DBMSs rely on disk (HDD/SSD). Redis stores operational data in RAM by default—latencies that are orders of magnitude lower than typical disk accesses. It is called “data structures as a service”: in addition to strings, there are lists, sets, hashes, sorted sets - all with atomic operations in memory. Typical roles: ultra-fast cache, sessions, counters, queues, leaderboards.
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