ElastiCache — Managed In-Memory Caching
How ElastiCache really works: Valkey, Redis OSS and Memcached and what each costs, cache-aside with TTLs and stampede protection, cluster mode with 16,384 slots, replicas and Multi-AZ failover, eviction policies, Serverless ECPU pricing, the 2026 durability option for Valkey, and when MemoryDB is the better answer.
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