AWS Certified Data Engineer Associate DEA-C01 Practice Question

RA3 nodes run on newer hardware, feature large high-performance SSD caches, and use Amazon Redshift Managed Storage (RMS) to keep less-frequently accessed blocks in low-cost S3. Migrating to a comparable RA3 cluster therefore adds capacity without paying for extra SSDs and typically increases cost by less than 100 percent. Enabling Concurrency Scaling automatically provisions transient compute when concurrency spikes, allowing 20 simultaneous queries to complete within seconds while you pay only for the brief burst. Simply resizing to DC2.8xlarge would almost double compute and storage cost, Athena would still scan large amounts of data and deliver higher latency, and Amazon RDS for PostgreSQL with read replicas is not optimized for large analytic joins.