Core concept
Config: min/max ACU. 1 ACU ~= 2 GB RAM + proportional CPU. Scales up/down without downtime.
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How it works
Cost: $0.12/ACU-hour. Higher than fixed instance but only pay for actual load. Good for variable/spiky.
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Trade-offs + gotchas
Dev/test (scales to min). Spiky prod workloads. Multi-tenant SaaS. Anywhere unclear steady-state.