Now you can use AWS CloudTrail to log data-plane API activity to monitor, alarm, and archive item-level activity in your Amazon DynamoDB tables

Now you can use AWS CloudTrail to log data-plane API activity to monitor, alarm, and archive item-level activity in your Amazon DynamoDB tables. You can use this information about item-level activity as part of an audit, to help address compliance requirements, and monitor which AWS Identity and Access Management (IAM) users, roles, and permissions are being used to access your table data. 

Source:: Amazon AWS