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I have one Oracle SE instance that is not multi-az and does not have encryption enabled, and I have an Oracle EE instance that is multi-az and has encryption enabled. The former has the option to change the subnet group through the console (modify instance > network and security), whereas the latter does not. Both instances are in a subnet group within the default vpc, and I have a custom vpc within the same account with another subnet group in it.
What conditions determine whether or not it is possible to change the subnet group of an RDS instance? I have not been able to find any documentation on this so far.
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Sign in to the AWS Management Console and open the Amazon RDS console at https://console.aws.amazon.com/rds/ . In the navigation pane, choose Option groups. Select the option group whose option that you want to modify, and then choose Modify option.
Each default parameter group contains database engine defaults and Amazon RDS system defaults based on the engine, compute class, and allocated storage of the instance. You can't modify the parameter settings of a default parameter group.
It's not possible to move an existing instance to another subnet, Availability Zone, or VPC. Instead, you can manually migrate the instance by creating a new Amazon Machine Image (AMI) from the source instance. Then, launch a new instance using the new AMI in the desired subnet, Availability Zone, or VPC.
An RDS Subnet Group is a collection of subnets that you can use to designate for your RDS database instance in a VPC. Your VPC must have at least two subnets. These subnets must be in two different Availability Zones in the AWS Region where you want to deploy your DB instance.
It is the Multi AZ Deployment that is the determining factor. To test this, modify your DB instance and turn off the Multi AZ Deployment. Once it is done, go modify it again and you'll notice you now have the option to change the subnet group.
I haven't found any indication as to the reason for this behavior in the AWS documentation.
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