Which solution will meet this requirement with the LEAST operational effort?
Use AWS Database Migration Service (AWS DMS) to migrate the DB instance from the source AWS account to the destination AWS account.
Create a DB snapshot of the DB instance. Share the snapshot with the destination AWS account. Create a new DB instance by restoring the snapshot in the destination AWS account.
Create a Multi-AZ deployment for the DB instance. Create a read replica for the DB instance in the source AWS account. Use the read replica to replicate the data into the DB instance in the destination AWS account.
Use AWS DataSync to back up the DB instance in the source AWS account. Use AWS Resource Access Manager (AWS RAM) to restore the backup in the destination AWS account.
Explanations:
AWS DMS is typically used for continuous data replication between databases, but it is not designed to migrate an entire RDS instance between accounts. It involves more operational effort and is not the most efficient solution for moving a full RDS instance.
This is the most straightforward solution. Creating a DB snapshot and sharing it with the destination account allows the destination account to restore the snapshot as a new DB instance with minimal operational overhead.
Multi-AZ and read replica setups are designed for high availability and scaling within a single account, not for migrating instances between accounts. Additionally, creating a read replica in a different AWS account is not supported.
AWS DataSync is mainly used for transferring large amounts of file-based data and is not designed for backing up or migrating RDS instances. AWS RAM is used for resource sharing, but it does not support the migration of RDS backups between accounts.
From what I’ve seen, the answer is:
Create a DB snapshot of the DB instance. Share the snapshot with the destination AWS account. Create a new DB instance by restoring the snapshot in the destination AWS account.