trying to restore a rds oracle db snapshot but cant because of a option group it doesnt let me select option group

I understand you're facing challenges while trying to restore an RDS Oracle DB snapshot due to an option group issue. This is a common scenario, especially when dealing with persistent options like Timezone. Here's how you can address this:

1. The error message you're seeing indicates that the original DB instance had a persistent option (Timezone) in its option group. When restoring from a snapshot of such an instance, you need to use an option group that contains the same persistent option.

2. You cannot simply select any option group or use the default one during the restore process. Instead, you need to create or use an option group that includes the Timezone option.

3. To resolve this:

• First, create a new option group if you don't already have one with the Timezone option.
• Add the Timezone option to this group. The settings for this option should match those of the original DB instance.
• When restoring the snapshot, make sure to select this newly created (or existing) option group that includes the Timezone option.

4. If you're restoring through the AWS Management Console, you should see an option to select the appropriate option group during the restore process. Look for the "Additional configuration" section where you can specify the option group.

5. If you're using the AWS CLI, you'll need to specify the option group when running the restore command.

Remember, when restoring from a snapshot of a DB instance that uses persistent or permanent options, it's crucial to choose an option group that contains the same options. This ensures that the restored instance maintains the same functionality and configuration as the original.

If you're still unable to select the appropriate option group during restoration, double-check that you have the necessary permissions and that the option group is compatible with the DB engine version of the snapshot you're restoring from.
Sources
Working with option groups in RDS Custom for Oracle - Amazon Relational Database Service
Tutorial: Restore an Amazon RDS DB instance from a DB snapshot - Amazon Relational Database Service
Understand the best practices for RDS for Oracle DB snapshot restores | AWS re:Post