Related: RDS
AWS RDS has subnet groups
For RDS each instance requires EBS storage
Each AWS RDS Instance can have multiple Database
StandBy server will sync updates with the Primary as soon it was received by the Primary (cross-AZ)
Read Replicas are also available, can be scaled out also in the same AZ or even different region
If backups are created they to be stored in S3 – AWS managed bucket, you won’t see it.
| Read Replicas | Multi-AZ | Multi Region (Read) |
|---|---|---|
| If the DB is read-loaded than up to 5 DB Replicas can be deployed | Replication of main DB to other AZ in case of AZ outage, for failover (HA). | Read replicas deployed in other regions |
| Data is only written to the main DB | Data is only read/written to the main DB | Changes written to the main DB |
| Can failover only to a single AZ | Optimizes read performance for global connections | |
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