Which solution will meet these requirements with the LEAST implementation effort?
Modify the RDS DB instance to use a Multi-AZ deployment. Apply the changes during the next maintenance window.
Migrate the current database to a new Amazon DynamoDB Multi-AZ deployment. Use AWS Database Migration Service (AWS DMS) with a heterogeneous migration strategy to migrate the current RDS DB instance to DynamoDB tables.
Create a new RDS DB instance in a Multi-AZ deployment. Manually restore the data from the existing RDS DB instance from the most recent snapshot.
Configure the DB instance in an Amazon EC2 Auto Scaling group with a minimum group size of three. Use Amazon Route 53 simple routing to distribute requests to all DB instances.
Explanations:
Modifying the RDS DB instance to use Multi-AZ deployment will provide high availability and automatic failover, meeting the requirement with minimal implementation effort as it only requires a configuration change within RDS.
Migrating to DynamoDB would require a major change to the data model and application logic, as DynamoDB is a NoSQL database, whereas RDS for MySQL is relational. This approach would involve significant effort, making it unsuitable for the requirement of minimal implementation effort.
Creating a new RDS instance and restoring from a snapshot requires manual setup and data restoration, which is more complex than simply enabling Multi-AZ on the existing instance. It also lacks automatic failover, making it less suitable for high availability with minimal effort.
Configuring DB instances within an EC2 Auto Scaling group is not suitable for an RDS instance and does not offer RDS’s built-in features like automatic backups and failover. Additionally, Route 53 simple routing is not intended for distributing requests to database instances in this manner.
From my perspective, the answer is:
Modify the RDS DB instance to use a Multi-AZ deployment. Apply the changes during the next maintenance window.