Subnet groups

A subnet group is a collection of two or more subnets in a VPC where we want to launch an RDS database. These subnets should be in different AZs. Subnet groups are a must when deploying RDS.

RDS storage autoscaling

We can configure RDS storage autoscaling for existing and new (during launch) RDS databases. Storage autoscaling allows RDS to automatically scale its storage size as the database grows, with no downtime. It’s supported for all database engines in RDS.

Note: Storage autoscaling continuously monitors consumption and scales the storage automatically when it’s close to full.

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