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In some cases, if you modify a DB instance or the DB parameter group associated with the instance, you must reboot the instance for the changes to take effect.
If your DB instance is deployed in multiple Availability Zones, you can force a failover from one AZ to the other during the reboot. You might force a failover to test the availability of your DB instance deployment or to restore operations to the original AZ after a failover occurs.
To reboot a DB instance
Sign in to the AWS Management Console and open the Amazon RDS console at https://console.aws.amazon.com/rds/.
In the navigation pane, click DB Instances.
Select the check box for the DB instance that you want to reboot.
Click Instance Actions and click Reboot.
To force a failover from one AZ to the other, in the Reboot DB Instance dialog box, select the Reboot with failover? check box.
Click Yes, Reboot. To cancel the reboot instead, click Cancel.