1Z0-1123-25 Question 104
Select 2Your organization maintains a multi-tier e-commerce application in the Phoenix region, utilizing Compute instances backed by Block Volumes, a MySQL Database Service deployment, and a public Load Balancer. To improve resilience and serve new customers on the East Coast, you must replicate and migrate these resources to the Ashburn region with minimal disruption. Which TWO solutions would successfully replicate the infrastructure while reducing downtime?
- A
Initiate Block Volume cross-region replication, create a MySQL read replica in the Ashburn region, and configure an identical Load Balancer there.
- B
Use Oracle Cloud Infrastructure Resource Manager to export existing resources as a Terraform configuration and apply that configuration in the Ashburn region.
- C
Reuse ephemeral public IP addresses from Phoenix in Ashburn to maintain consistent IP addressing and avoid application updates.
- D
Perform a 'live migration' using a built-in one-click feature that automatically copies all resources and preserves their original IP addresses in the target region.
Show answer and explanation
Correct answers: A, B
Explanation
To migrate multi-tier applications between OCI regions with minimal downtime, you should rely on officially supported replication mechanisms, such as Block Volume cross-region replication and MySQL read replicas or backups, along with Infrastructure as Code (Terraform) to recreate your stack in the target region. OCI Resource Manager can export existing resources automatically into a stack, helping to maintain consistency and reduce errors. For further details, consult the Oracle Cloud Infrastructure documentation on cross-region replication for Block Volumes and MySQL Database Service, as well as the Resource Manager user guide for multi-region deployments.
- A. Correct.
Block Volume cross-region replication is a supported feature that replicates data to another region without manual backup and restore. For MySQL Database Service, creating a read replica (or configuring asynchronous replication if supported) ensures minimal downtime. Recreating the Load Balancer configuration in the target region is crucial to serve traffic from the new region.
- B. Correct.
Using OCI Resource Manager to generate Terraform configurations from your current compartment and reapplying them in the target region is a best practice. It ensures consistency by automating the creation of networking, compute instances, and other resources with minimal risk of manual errors.
- C. Incorrect.
Ephemeral public IP addresses are region-specific and cannot be transferred between regions. Attempting to reuse them would cause failures or conflicts, so this approach is not feasible for cross-region migration.
- D. Incorrect.
OCI does not offer a single one-click 'live migration' feature that moves all resources, including IP addresses, without reconfiguration. Migration requires proper planning, replication, and deployment procedures rather than an automated bulk transfer.