Changing a DB Instance Class

Scenarios

You can change the instance class (vCPUs and memory) of a DB instance as required.

Constraints

• An instance cannot be deleted while its instance class is being changed.

• After you change instance classes, the DB instances will be rebooted and service will be interrupted. You are advised to change instance classes during off-peak hours.

Procedure

1. Log in to the management console.
2. Click in the upper left corner of the page and choose Databases > Relational Database Service.
3. On the Instances page, locate the target DB instance and choose More > Change Instance Class in the Operation column.

   Alternatively, click the instance name to go to the Basic Information page. Under Instance Class, click Configure.

4. On the displayed page, specify the new instance class and click Next.
5. Check the change result.

   Changing the DB instance class takes 5–15 minutes. During this period, the status of the DB instance on the Instances page is Changing instance class. After a few minutes, click the instance name and view the instance class displayed on the Basic Information page to check that the change is successful.

   

   After you change the instance class of an RDS for SQL Server instance, the value of max server memory will be changed accordingly. You are advised to set max server memory to Memory size (GB) x 1024 x 0.85 – 1.5 x 1024. For example, if your memory is 4 GB, set max server memory to 1946 MB (4 x 1024 x 0.85-1.5 x 1024).