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- Fully managed relational database service
- Automated provisioning and maintenance
- Full backups and point in time restore
- Monitoring dashboards
- Multi AZ setup for DR
- Read replicas for improved performance
- Storage backed by EBS
- Vertical and horizontal scaling
- Supports
- Postgres
- MySql / MariaDB
- Oracle
- IBM DB2
- MSSQL
- Aurora (Postgres and MySQL)
- You cannot SSH or access the underlying database compute instance
- Storage auto-scaling
- Scale out database reads
- read replicas only support select statements
- Improves performance for reads
- You can create up to 15 read replicas in the same AZ, cross AZ, or cross region
- Asynchronous replication, reads are eventually consistent
- You can promote a read replica to a full read/write instance
- Apps must update the connection string to use a read replica
- Network costs
- If the replica is in the same region, there is no fee for network traffic
- Cross region replicas will cost you for replication traffic
- Fully managed database proxy for RDS
- Allow apps to pool and share DB connections established with the database
- Improves database efficiency by reducing stress on the database resources by pooling connections at the proxy
- Serverless, autoscaling, HA
- Reduced RDS and Aurora failover time by up to 66%
- RDS proxy is only accessible from within the VPC, it is never publicly accessible
- RDS proxy is particularly helpful when you have auto-scaling lambda functions connecting to your database