Ensure there are no Underutilized RDS Instance


Identify any Amazon RDS database instances that appear to be underutilized and downsize (resize) them to help lower the cost of your monthly AWS bill. By default, an RDS database instance is considered underutilized” when meets the following criteria:

  • The average CPU utilization has been less than 60% for the last 7 days.
  • The total number of ReadIOPS and WriteIOPS recorded per day for the last 7 days has been less than 100 on average.

The AWS CloudWatch metrics utilized to detect underused RDS instances are:

  • CPU utilization – the percentage of CPU utilization (Units: Percent).
  • ReadIOPS and WriteIOPS – the average number of disk I/O (Input/Output) operations per second (Units: Count/Second).


1. Log in to the AWS Management Console.

2. Navigate to RDS dashboard.

3. In the navigation panel, under RDS Dashboard section, choose Instances.

4. Select the underused RDS database instance that you want to resize.

5. Click the Instance Actions button from the dashboard top menu and select Modify.

6. On the Modify DB Instance: <instance identifier> page, under Instance Specifications section, select the database instance type to downsize to (e.g. db.m3.medium) from the DB Instance Class dropdown list.

7. At the bottom of the page, check Apply Immediately to apply the instance type (class) change immediately.

8. Click Continue to access the database instance review page.

9. Review the type/class changes then click Modify DB Instance. During the resize process the instance status should change from available to modifying and back to available.







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