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Re:The DynamoDB Book: Data Modeling with NoSQL and DynamoDB by arpinum on Friday May 15, 2020 @05:33PM (#23197727)
> RDS maxes out RAM at 768GiB

RDS goes 4TB on X1e instance type. But the point is RDBMS systems handle a large amount of data and workload types before needing to reach for specialist systems

I don't know how you are doing write transactions in 5ms on DynamoDB. Single puts p50 maybe, but i've never seen p90 put operations below 10ms.

Re:The DynamoDB Book: Data Modeling with NoSQL and DynamoDB by dropofwill on Friday May 15, 2020 @06:22PM (#23198215)
Yeah, p50, all use cases we have are single row updates.