What is DynamoDB number and string data type storage space

Question

What is the storage space for a number type in DynamoDB Number vs string type?

Say I have a number (1234789). If I store it as a number type, then it will take just 4 bytes, and as a string, it will take 7 bytes?

Do DynamoDB store all numbers as bigdecimal?

Answer 1

DynamoDB is a cloud service so the way they store the data cant be determined. They transfer numbers as strings for better language compatibility. So the number size is considered as string size. Consider this while calculating provisioned throughput and costs.