Where should the AWS DMS replication instance be placed for the MOST optimal performance?
In the same Region and VPC of the source DB instance
In the same Region and VPC as the target DB instance
In the same VPC and Availability Zone as the target DB instance
In the same VPC and Availability Zone as the source DB instance
Explanations:
Placing the AWS DMS replication instance in the same Region and VPC as the source DB instance (us-east-1) is not optimal since the target DB instance is in a different region (us-west-2). Cross-region data transfer introduces latency, making this option suboptimal.
Placing the AWS DMS replication instance in the same Region and VPC as the target DB instance (us-west-2) might reduce cross-region latency, but it still involves transferring data across regions, which can be inefficient and slow.
The most optimal solution is to place the DMS replication instance in the same VPC and Availability Zone as the target DB instance (us-west-2). This minimizes latency between the replication instance and the target, ensuring efficient data transfer.
Placing the AWS DMS replication instance in the same VPC and Availability Zone as the source DB instance (us-east-1) is inefficient due to cross-region data transfer. The replication instance should ideally be closer to the target to minimize latency and improve performance.
I organize that the answer is:
In the same VPC and Availability Zone as the target DB instance