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Assume 8 state transitions and 200 approved signups in a month: 1,600 transitions. Step Functions Standard includes 4,000 free transitions a month in US East (N. Virginia) at $0.000025 after that. The workflow marks READY only after the health check.
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.
For a mid-market retailer (~2.4M SKUs, checkout p95 1.9s → 420ms), DynamoDB cart + Step Functions checkout + conditional inventory cuts held 2.1k checkout RPS — after a cache-as-inventory mistake oversold 380 units in 12 minutes.
DynamoDB on-demand bills $0.625 per million writes and $0.125 per million reads — pay-per-request convenience with no capacity planning. Provisioned at $0.00065/WCU-hour wins on steady traffic above ~30% utilization. Every GSI doubles the write cost, IA tier cuts storage 60% but adds 25% to request fees, and Global Tables compound the bill per region.
July 2026 field note: Aurora failover windows still force app timeouts above tens of seconds; DynamoDB hot partitions and short transactions remain the scaling levers — with a partition-math worksheet you can reproduce.
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