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Date: 2024-12-02 08:09:01
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You can create a Blue/Green deployment. This allows you to make the change with just a few clicks in the Console and without modifying your application.

Steps:

  1. Create a new RDS Blue/Green Deployment with the desired size
  2. Validate the it has the correct size
  3. Switch over to it
  4. Delete the old instance
  5. Delete the Blue/Green Deployment

https://aws.amazon.com/about-aws/whats-new/2024/11/amazon-rds-blue-green-deployments-storage-volume-shrink/

If you encounter an issue where the creation doesn't reduce the size, you might be trying to shrink it too much. Try a larger value.

Thanks to Sean for pointing this out in a comment.

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Posted by: andres101