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Hi, Good question
From https://jayendrapatil.com/aws-rds-db-maintenance-upgrades/
Operating System Updates
Upgrades to the operating system are most often for security issues and should be done as soon as possible.
OS updates on a DB instance can be applied at ones convenience or can wait for the maintenance process initiated by RDS to apply the update during the defined maintenance window
DB instance is not automatically backed up when an OS update is applied, and should be backup up before the update is applied
answered 2 years ago
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Thank you for your fast response. But my question is not about how necessary to do the upgrade. I looked for the action to upgrade but I didn't find an action related to upgrade RDS's OS on the dashboard of RDS. How can I upgrade?
As per the documentation, it is scheduled to be performed in the maintenance window
https://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/USER_UpgradeDBInstance.Maintenance.html and https://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/USER_UpgradeDBInstance.Maintenance.html#Mandatory_OS_Updates
Sorry for the late response. I didn't receive the notification that this thread has new comments. Thank you for your reply. But actually, the problem is I didn't find the upgrade action while the upgrade alert email told me to do the action.