You can call describe-valid-db-instance-modifications to learn whatmodifications you can make to your DB instance.Show details from next link. https://docs.aws.amazon.com/ja_jp/cli/latest/reference/rds/describe-valid-db-instance-modifications.html
| aws rds describe-valid-db-instance-modifications --db-instance-identifier optimized-cpu-db --region us-west-2 |
| New features to reduce and optimize vCPUs on Amazon RDS for Oracle Database | AWS Database Blog : http://aws.amazon.com/blogs/database/new-features-to-reduce-and-optimize-vcpus-on-amazon-rds-for-oracle-data/ |
| aws rds describe-valid-db-instance-modifications --db-instance-identifier my-sqlserver-db |
| Migrating Your SQL Server Databases to Amazon RDS - DAT312 - re:Inven… : http://www.slideshare.net/AmazonWebServices/migrating-your-sql-server-databases-to-amazon-rds-dat312-reinvent-2017 |