AWS Cloud Architect Practice Exam 2025 - Full Prep Guide

Using Amazon ElastiCache is an effective way to improve performance and reduce costs for frequently accessed data within Amazon Relational Database Service (RDS). ElastiCache is a fully managed caching service that supports Redis and Memcached, enabling faster data access by caching frequently requested data in memory. This significantly reduces the number of read operations made directly to the RDS instance, alleviating load and enhancing response times for applications.

By leveraging caching, applications can retrieve data from the cache for quick access rather than querying the database each time. This not only improves performance by serving data faster but also contributes to cost savings, as it reduces the database load and consequently the potential need to scale up RDS instances to handle traffic. Therefore, using ElastiCache can optimize the overall architecture by ensuring that the database remains responsive while effectively managing costs by minimizing read operations.

The alternative options, while valuable in their own right, do not serve the same purpose. Amazon S3 is primarily used for object storage rather than caching database queries. Amazon CloudWatch is a monitoring service, useful for tracking performance and resource utilization, but it doesn't directly enhance data access speeds. Amazon Kinesis is designed for real-time data streaming and analytics, which is unrelated to caching frequently accessed data from a