Which solution meets these requirements?
Create a snapshot of the source DB instance in the source account. Share the snapshot with the destination account. In the target account, create a DB instance from the snapshot.
Use AWS Resource Access Manager to share the source DB instance with the destination account. Create a DB instance in the destination account using the shared resource.
Create a read replica of the DB instance. Give the destination account access to the read replica. In the destination account, create a snapshot of the shared read replica and provision a new RDS for MySQL DB instance.
Use mysqldump to back up the source database. Create an RDS for MySQL DB instance in the destination account. Use the mysql command to restore the backup in the destination database.
Explanations:
Creating a snapshot of the source DB instance and sharing it with the destination account allows the new account to create a DB instance from the snapshot. This is a quick and efficient method to migrate the database, as it avoids the need for data export/import or replication setups.
AWS Resource Access Manager (RAM) does not support sharing RDS instances across accounts. RAM is typically used for sharing resources like subnets, transit gateways, and other AWS services, but not RDS instances.
Creating a read replica in the source account and sharing it with the destination account is not a valid method for migrating a MySQL RDS instance. Read replicas cannot be directly shared across accounts, and creating a snapshot from a read replica would be inefficient compared to directly sharing a snapshot of the primary DB instance.
Using mysqldump to back up the source database and restoring it in the destination account is a viable option but not the most efficient. With 12 TB of data, this method would take a considerable amount of time due to the export/import process, making it less suitable for minimizing migration time.
I structure that the answer is:
Create a snapshot of the source DB instance in the source account. Share the snapshot with the destination account. In the target account, create a DB instance from the snapshot.