1Z0-1123-25 Question 52
Select 2Your organization is preparing to migrate a production Oracle Database from its on-premises data center to Oracle Cloud Infrastructure using Zero Downtime Migration (ZDM). The business requires minimal outage during the transition. Which TWO tasks must you complete to ensure successful replication and cutover to the new environment?
- A
Use ZDM to perform the initial data transfer, then apply incremental updates using an Oracle replication technology (e.g., Data Guard or GoldenGate) while monitoring replication lag.
- B
Permanently shut down the on-premises source database for an extended period (e.g., 24 hours) before starting the ZDM migration process.
- C
Expose the source database publicly on port 1521 to avoid firewall restrictions, ensuring that the replication can reach the target environment without extra configuration.
- D
Perform a planned switchover test after the initial load to confirm the target database is ready to handle production traffic with minimal downtime.
Show answer and explanation
Correct answers: A, D
Explanation
Zero Downtime Migration (ZDM) integrates with Oracle Data Guard or Oracle GoldenGate to replicate changes from the on-premises database to Oracle Cloud Infrastructure in real time. The best practice is to keep the source online during migration, capture incremental changes continuously, and then perform a test switchover to confirm the target's readiness before final cutover. Refer to Oracle's official Zero Downtime Migration documentation for recommended network configurations and detailed steps to ensure data consistency and minimize downtime.
- A. Correct.
Correct. ZDM typically handles an initial data load and then applies incremental changes in near real-time. Monitoring replication lag ensures data is up to date and mitigates the risk of data loss during the final cutover.
- B. Incorrect.
Incorrect. One major benefit of ZDM is minimal downtime. You do not need to shut down the on-premises database for an extended period; instead, you keep the source online and let ZDM or associated Oracle replication technologies capture changes continuously.
- C. Incorrect.
Incorrect. Opening the source database publicly on port 1521 is a security risk and not a best practice. Instead, you should configure secure connectivity (e.g., VPN or FastConnect) and proper firewall rules to allow replication traffic only between trusted endpoints.
- D. Correct.
Correct. After the initial replication, a planned switchover (often preceded by a test cutover) verifies that the target environment is synchronized and ready to accept production traffic with minimal downtime.