Caching

ElasticCache

• Managed service of Memcached and Redis
• Helps reduce load of databases for read intensive workloads
• Helps make your application stateless
• Memcached
  • Simple database caching solution
  • Not a database by itself
  • No failover or Multi-AZ support
  • No backups
  • Multi-node for partitioning of data (sharding)
• Redis
  • Supported as a caching solution
  • Functions as a standalone database
  • Read Replicas to scale reads and have high availability
  • Failover and Multi-AZ support
  • Supports backups
  • Data Durability using AOF persistence
  • Supports Sets and Sorted Sets

Cache Security

• Supports IAM Authentication for Redis
• IMA policies on ElasticCache are only used for AWS API-level security
• Redis AUTH
  • You can set a "password/token" when you create a Redis cluster
  • This is an extra level of security for your cache (on top of security group)
  • Support SSL in flight encryption
• Memcached
  • Support SASL-based authentication (advanced)

DynamoDB Accelerator (DAX)

• Is a fully managed, highly available, in-memory cache for DynamoDB
• Can reduce DynamoDB response times from milliseconds to microseconds
• Highly available and lives inside the VPC you specify