1Z0-997-25 Question 147
Single answerYour organization is migrating a mission-critical multi-tier workload from an on-premises data center to Oracle Cloud Infrastructure (OCI) using Oracle Cloud Migrations. You need to ensure minimal downtime while maintaining data integrity and consistency for the databases and application dependencies involved. Which strategy best meets these requirements?
- A
Stop all source servers and data flows, then take full backups of each tier before restoring them in OCI and bringing all services online again.
- B
Use Oracle Cloud Migrations to set up continuous replication of each tier, schedule final incremental sync, and perform a controlled short downtime cutover.
- C
Manually export VM images to OCI, deploy them as new instances in OCI, and then sync the database data after go-live.
- D
Use daily block volume backups for the database tier, restore them in OCI, and let the application tier run offline until the final restore is complete.
Show answer and explanation
Correct answer: B
Explanation
Oracle Cloud Migrations provides an automated way to replicate your source environment to OCI in near real-time, allowing you to run your on-premises systems until you are ready to finalize synchronization and execute a controlled cutover. This approach minimizes downtime while ensuring data consistency. Oracle documentation recommends performing incremental replication, validating the newly created environment, scheduling a final synchronization, and only then switching production traffic to the OCI environment. Refer to the 'Using Oracle Cloud Migrations' guide for detailed steps and best practices.
- A. Incorrect.
Option 1 is incorrect because stopping all services for a full backup leads to extended downtime and does not leverage incremental replication capabilities.
- B. Correct.
Option 2 is correct because using Oracle Cloud Migrations for continuous replication and scheduling a final incremental sync before a short downtime cutover ensures minimal service interruption while maintaining data consistency.
- C. Incorrect.
Option 3 is incorrect because migrating the VM images first and syncing the database data after go-live can lead to data inconsistency and potential downtime if mismanaged.
- D. Incorrect.
Option 4 is incorrect because relying on daily block volume backups for final migration will likely result in a longer downtime window and does not fully address real-time or near-real-time data updates.