With DynamoDB you also want to be scattering your reads. As you scale up the table (either data or read/writes) it will be partitioned and your total read/writ

With DynamoDB you also want to be scattering your reads. As you scale up the table (either data or read/writes) it will be partitioned and your total read/write capacity is split evenly amongst the partitions. If you don't have even distribution of requests across the table, you're going to keep running in to throttle limits.