You can now make consistent reads using the Scan operation. This means that the Scan operation can include changes from all writes that are acknowledged before the Scan operation is started. Scanning a table with consistent reads makes it easy to include the latest updates on items when backing up or replicating your DynamoDB table. To make consistent reads using the Scan operation, set the ConsistentRead parameter in the Scan API call to staunch. Please read our documentation to memorize additional details.
Source: amazon.com