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AWS Certified Solutions Architect - Associate · AWS
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The is a huge demand for auto-scaling which Amazon RDS cannot do. This contributes to the cost savings as Aurora serverless would scale done in low peak times, this contributes to low costs.
RDS is cheaper than Aurora.
RDS is cheaper than Aurora if you have a fixed instance size, but NOT if you have "unpredictable" usage patterns, then Aurora Serverless (!) is cheaper.