Final answer:
The maximum size for a row (item) in Amazon DynamoDB is 400 KB. Each item in DynamoDB has a primary key consisting of a partition key and an optional sort key. The maximum size includes attribute names and values.
Step-by-step explanation:
The maximum size for a row (item) in Amazon DynamoDB is 400 KB. Each item in DynamoDB has a primary key which consists of a partition key and an optional sort key. The partition key is used to distribute the data across multiple servers, while the sort key is used to order the items within a partition. The maximum size of an item includes the size of the attribute names as well as the attribute values.