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ElastiCache bills node-hours for Redis/Valkey clusters and ECPUs for Serverless. A cache.r7g.large with two replicas is 3× the primary node cost before data transfer. Serverless wins below ~$800/mo steady cache spend; provisioned nodes win above it.
ElastiCache loses your AI chatbot's session memory at every node replacement. MemoryDB doesn't. A decision framework for when to pick MemoryDB over ElastiCache, OpenSearch Serverless, and S3 Vectors for AI workloads, with the latency math and the failure mode that forces the switch.
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