DDB tables automatically send data to CloudWatch metrics. This is the quickest and easiest way to confirm that your calculations and provision capacity are meeting your needs. It also helps you keep an eye on your usage to track your throughput needs over time. All metrics appear in the AWS/DynamoDB namespace. Some of the most interesting metrics for throughput calculations are as follows:

• ConsumedReadCapacityUnits
• ConsumedWriteCapacityUnits
• ReadThrottleEvents
• WriteThrottleEvents

There are other metrics available; see the Amazon DynamoDB Metrics and Dimensions documentation for more details.