1Z0-1123-25 Question 140
Select 3A multinational retail company is migrating a 10 TB Oracle Database 19c instance from its on-premises data center to Oracle Cloud Infrastructure. The project requires minimal downtime, a robust fallback plan, and thorough performance validation before striking final cutover. Which THREE actions should you include in your migration design to ensure a successful database migration plan?
- A
Use Oracle Zero Downtime Migration (ZDM) for automated data transfer and fallback readiness
- B
Rely solely on Oracle Data Pump exports without additional verification processes
- C
Plan and test network throughput to ensure large data volumes can be transferred within the defined window
- D
Migrate the entire schema in a single step without a pilot run or testing phase
- E
Validate performance baselines on the target environment prior to final cutover
Show answer and explanation
Correct answers: A, C, E
Explanation
When designing a successful database migration plan, Oracle recommends a thorough analysis of network capacity, testing processes (pilot runs), and choosing suitable tools (ZDM, Oracle GoldenGate, etc.) to minimize downtime. Refer to Oracle� official migration documentation for best practices around capacity planning, testing, and fallback strategies. Including performance validations, staged migrations, and automated tooling significantly reduces risk and increases overall success in complex database migrations.
- A. Correct.
Correct: ZDM provides an automated framework for a near-zero downtime approach. It helps orchestrate data transfer, configure standby environments, and allows rollback if issues arise, aligning well with minimal downtime and a fallback plan.
- B. Incorrect.
Incorrect: While Oracle Data Pump is a valid tool for data export/import, depending on it alone without any validation or fallback mechanism can lead to data inconsistencies and potential downtime if errors occur.
- C. Correct.
Correct: Network throughput tests are essential for assessing if your link can handle large data transfers in the available time window. Inadequate bandwidth or untested network paths frequently lead to extended downtime or incomplete migrations.
- D. Incorrect.
Incorrect: Skipping pilot runs or test migrations greatly increases the risk of errors during the final cutover. Best practices recommend testing smaller segments and verifying performance before migrating production data.
- E. Correct.
Correct: Establishing performance baselines on the target environment ensures configurations, capacity, and performance are as expected. Validating these baselines allows adjustments prior to going live, reducing post-cutover surprises.