Set a maximum instance size for an RDS
From the DuploCloud Portal, navigate to Administrator -> Systems Settings.
Select the System Config tab, and click Add. The Update Config AppConfig pane displays.
In the Config Type list box, select AppConfig.
From the Key list box, select RDS allowed max instance size.
From the Value list box, select the maximum instance size.
Click Submit. RDS instances will be limited to the maximum instance size configured.