Currently, you can scale up storage space and change the CPU and memory of an RDS DB instance.
- When scaling storage space, RDS DB instances are available and services are not affected. However, you cannot delete or reboot DB instances that are being scaled.
- After changing the CPU or memory of a DB instance, the database service will reboot automatically. During the process, the DB instance is unavailable and cannot be connected. You cannot delete the DB instance while changing its CPU and memory.