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AWS Certified Solutions Architect - Professional · AWS
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Product data stays in RDS (best match for structured relational data). User session data goes into DynamoDB global table (great for ephemeral + global replication). Decoupled workloads. Very high performance.
Memcached isnt supported in elasticache global tables: https://aws.amazon.com/elasticache/faqs/#topic-7 "Global Datastore is supported on ElastiCache version 7.2 for Valkey and ElastiCache version 5.0.6 onward for Redis OSS." https://docs.aws.amazon.com/AmazonElastiCache/latest/dg/Redis-Global-Datastore.html
"Structured data" should be a giveaway.....no matter how fast DynamoDB is, it's still a key-value storage. Yeah a simple JSON can be stored effectively, but actual data will never be as fast as a proper RDS.