In the previous post, I learned about Amazon DynamoDB Provisioned mode when allocating resources. You can also use On-demand when allocating but this mode is not the default when creating a table you need to change from provisioned (5 RCU, 5 WCU) to on-demand.
The on-demand mechanism gives me more flexibility in billing, only paying according to the number of requests without capacity planning. In case you want to configure the transfer between Provisioned and On-Demand you can easily do it but note that it can only be transferred once every 24 hours.
Ref: AWS DynamoDB Limits
Usually Kevin uses DynamoDB on-demand mode in a dev environment or with applications where he cannot estimate the read and write frequency, or the read and write frequency is unstable (sometimes too much, sometimes too little, using provisioned). would be costly).