Amazon DynamoDB now supports percentile statistics for the SuccessfulRequestLatency Amazon CloudWatch metric. The percentile statistic enables you to understand the latency distribution of your successful requests to DynamoDB, complementing the existing average, minimum, and maximum statistics.
The SuccessfulRequestLatency metric only measures latency which is internal to the Amazon DynamoDB service – client side activity and network trip times are not included. It’s normal to see some variability in this metric. When analyzing your latency, it’s best to consider your end-to-end latency which includes client side activity. To factor in your client side activity, you can enable latency metric logging in your AWS SDK.
The new percentile statistic is available in all commercial AWS Regions, the AWS GovCloud (US) Regions, and the China Regions.
To learn more about the percentile statistic and troubleshooting latency on DynamoDB, see the following:
DynamoDB Metrics and Dimensions in the DynamoDB Developer Guide
Troubleshooting latency issues in Amazon DynamoDB in the DynamoDB Developer Guide
Source:: Amazon AWS