AWS Fundamentals: RDS + Aurora + ElastiCache

Study Files

Quick Decision Tree

Which Database Service?
├── Relational (SQL)?
│   ├── Managed, no OS access?
│   │   └── RDS (PostgreSQL, MySQL, MariaDB, Oracle, MS SQL, IBM DB2)
│   ├── Need OS/DB customization (Oracle/MS SQL)?
│   │   └── RDS Custom
│   ├── High performance, auto-scaling storage, cloud-native?
│   │   └── Aurora (5x MySQL, 3x Postgres perf)
│   └── Serverless, unpredictable workloads?
│       └── Aurora Serverless
├── In-memory cache (sub-ms latency)?
│   ├── Need HA, replication, persistence, sorted sets?
│   │   └── Redis (ElastiCache)
│   └── Simple caching, multi-threaded, sharding?
│       └── Memcached (ElastiCache)
└── Need connection pooling / reduced failover time?
    └── RDS Proxy

Key Ports to Remember

Related Sections

• High Availability & Scalability
• EC2 Instance Storage