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Hello roberto,
DAX would only be effective for items that are read repeatedly. Take note that it is still a caching solution, the performance gain in reads only applies to items that are already stored in the cache, your DAX cluster stills need to fetch data from the DynamoDB table, hence it still consumes RCU. Since the ProvisionedThroughputExceededException is an error at the DynamoDB level, you can either increase the provisioned RCU or handle the error thru error retries and exponential backoff.
Let me know your thoughts.
Regards,
Carlo @ Tutorials Dojo
