For anyone interested in the differences between dynamo (the early internal-only KV store described in this paper) and DynamoDB (The AWS service), Marc Brooker has an excellent writeup https://brooker.co.za/blog/2025/08/15/dynamo-dynamodb-dsql.h...

It is their previous one. I did read another paper about DynamoDB, but still there is not much details.

For example, I want to know how to calculate the charge of incremental export. One blog says it is charged by the amount of change logs (but the official doc doesn't say so), which makes sense. But how do I estimate the amount? My hunch is: Put + Write + (1~100) * TransitWrite + Update + Delete + (1~25) * BatchWrite.

Nothing to do with DynamoDB except the name.

This is massively different from DynamoDB.