DynamoDB Accelerator (Dax)

• Improve read by using in-memory cache for DynamoDB
• Fully-managed, highly available
• Solves "hot key" problem (too many reads)
• 5 minutes TTL for cache
• Up to 10 nodes in the cluster
• Multi-AZ
  • 3 nodes minimum recommended for production
• Secure
  • Encryption at rest with KMS, VPC, IAM, CloudTrail

DAX or ElasticCache

• DAX is for individual object cache
• Elasticache more for the result as a whole