Amazon Relational Database Service (Amazon RDS) Blue/Green Deployments now supports the ability to shrink the storage volumes for your RDS database instances, allowing you to better utilize your storage resources and manage their costs. You can now increase and decrease your storage volume size based on anticipated application demands.
Previously, to shrink a storage volume, you had to manually create a new database instance with a smaller volume size, manually migrate the data from your current database to the newly created database instance, and switch database endpoints, often resulting in extended downtime. Blue/Green Deployments create a fully managed staging environment, or Green databases, with your specified storage size, and keep the Blue and Green databases in sync. With a few clicks, you can promote the Green databases to be the new production system in as fast as a minute, with no data loss and no changes to you’re application to switch database endpoints.
Amazon RDS Blue/Green Deployments support for storage volume shrink is available for Amazon RDS for PostgreSQL major versions 12 and higher, RDS for MySQL major versions 5.7 and higher, and Amazon RDS for MariaDB major versions 10.4 and higher.
In a few clicks, update your databases using Amazon RDS Blue/Green Deployments via the Amazon RDS Console. Learn more about RDS Blue/Green Deployments and the supported engine versions here.
Source:: Amazon AWS