DynamoDB doesn't have SQL queries; but yes, if you're performing an operation which reads 10 million items from ddb it will be absurdly expensive. It will also

DynamoDB doesn't have SQL queries; but yes, if you're performing an operation which reads 10 million items from ddb it will be absurdly expensive. It will also take an absurdly long time; by default ddb is limited to 40k read request units (= 80k eventually consistent reads of up to 1 kB) per second. Being so slow would probably make users realize they're doing something wrong.