Exam AWS Certified Database - Specialty topic 1 question 297 discussion

C. on-demand capacity mode "With on-demand capacity mode, DynamoDB charges you for the data reads and writes your application performs on your tables. You do not need to specify how much read and write throughput you expect your application to perform because DynamoDB instantly accommodates your workloads as they ramp up or down." https://docs.aws.amazon.com/wellarchitected/latest/serverless-applications-lens/capacity.html#:~:text=With%20on%2Ddemand,up%20or%20down.

C is correct

It's C.

A. That will not resolve the write throttling B. ElastiCache does not make sense with DynamoDB C. Why not provisioned w/autoscaling? Anyway, this is the answer that makes more sense D. Using DynamoDB Accelerator does require a change to the app

C Because the issue is with not only Read but writes also. DAX will only improve read performance

D DynamoDB Accelerator (DAX) is an in-memory cache that can be used to improve the performance of DynamoDB by caching frequently accessed data. It can help reduce the number of read requests to the backend DynamoDB table, thus reducing the likelihood of throttling. Option C, using on-demand capacity mode for the DynamoDB table, is a valid solution for avoiding throttling, but it may not be the most cost-effective option for applications with consistent or high workloads.

On demand.