The secret behind DynamoDB’s ability to handle massive amount of data with Single digit millisecond latency is partitioning behavior: https://blog.codeship.com/partitioning-behavior-of-dynamodb/.

Further, I tried to explain how selection of proper Partition Key affects provisioned throughput and which strategy should be used to avoid certain problems such as Hot Key problem. This is third part of three part article series on DynamoDB, and other articles are Query and Pagination with DynamoDB and Working with DynamoDB.

Please share your feedback, and hope this helps. Thank you. - Parth Modi