vector-search

On August 5, 2026 DynamoDB GA’d native vector search — single-digit ms at 99%+ recall, up to 4096 dims, SearchVectors topK ≤ 100. Decision guide vs S3 Vectors, OpenSearch, and Bedrock Knowledge Bases.

Rules engines miss fraud rings that mutate weekly. Graph + vector queries don't. A July 2026 production guide to Neptune Analytics — m-NCU sizing (including 32/64 pilots), pause-at-10% cost control, WCC fraud rings, and GraphRAG-ready vector indexes.

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.