What is DynamoDB Accelerator (DAX)?

Amazon DAX (DynamoDB Accelerator) is a fully managed in-memory caching service for Amazon DynamoDB that helps improve read performance from milliseconds to microseconds — up to 10x faster for read-heavy applications

What is the role of SSM Agent?

The SSM Agent is a lightweight software component that runs on your managed instances. It allows AWS Systems Manager to securely communicate with the instance and execute tasks