1Z0-1123-25 exam dumps: 150 free OCI 2025 Migration Architect Professional practice questions

Correct answer: A

• A. Correct.

  Correct. Oracle Cloud Infrastructure Database Migration provides continuous data replication for near-zero downtime. This approach allows you to synchronize production and cloud databases in real time, then perform a final small cutover window to avoid lengthy downtime.

• B. Incorrect.

  Incorrect. While Data Pump exports and imports are reliable, they are offline and would require substantial downtime for a 5 TB database, as the system cannot update during the export/import process.

• C. Incorrect.

  Incorrect. Nightly file-based backups do not ensure continuous replication. Even if the backups are incremental, you still risk missing transactions that occur between backups, making it unsuitable for minimal downtime requirements.

• D. Incorrect.

  Incorrect. While the Data Transfer Disk Service speeds up large offline transfers, it requires shipping physical disks, which introduces extended transit time. This method is effective for cold data migrations but not ideal for near-real-time replication.

Correct answer: B

• A. Incorrect.

  Option 1: This involves taking the source database offline for the duration of the export/import, which can lead to significant downtime. While Data Pump is a straightforward approach, it does not meet the minimal downtime requirement for mission-critical workloads.

• B. Correct.

  Option 2: This is correct. Oracle Zero Downtime Migration (ZDM) orchestrates the migration process, and using Oracle GoldenGate allows for near real-time replication of changes. The on-premises database remains operational during most of the migration, reducing downtime to a minimal cutover window.

• C. Incorrect.

  Option 3: While the Oracle Data Transfer Appliance is efficient for migrating large volumes of data, it typically requires an offline approach. This does not support continuous replication or minimal downtime because you must ship data physically and then restore it in the cloud.

• D. Incorrect.

  Option 4: Manually copying RMAN backups to OCI object storage can work but introduces more steps and potential manual errors. It also requires downtime while the production database is backed up and restored, which is not optimal for mission-critical services demanding minimal downtime.

Correct answer: B

• A. Incorrect.

  Option 1: This one-time cutover might seem appealing, but if the environment is mission-critical, any downtime can impact business operations. Even during off-peak hours, a 'big-bang' approach risks extended outages if unexpected issues arise.

• B. Correct.

  Option 2: Using Oracle GoldenGate is the most appropriate method to achieve near-zero downtime. GoldenGate can replicate changes in real-time from the on-premises database to OCI, ensuring continuous data synchronization. Once the databases are in sync, you can switch production with minimal business disruption.

• C. Incorrect.

  Option 3: Exporting and importing the entire database while it is offline can introduce significant downtime. This approach may be suitable for smaller or less critical applications but does not meet the requirement for near-zero downtime.

• D. Incorrect.

  Option 4: Taking full backups and manually applying updates is prone to errors and latency. It does not provide real-time replication or seamless switchover, making it unsuitable for minimizing downtime in mission-critical environments.

Correct answer: B

• A. Incorrect.

  Option 1 is incorrect because an offline export/import approach might be simpler, but it causes significant downtime during the export, transfer, and import phases. This does not align with the minimal downtime requirement.

• B. Correct.

  Option 2 is correct because Oracle Zero Downtime Migration (ZDM) supports continuous data replication from on-premises to OCI, greatly reducing downtime by allowing near real-time synchronization. After data is synchronized, you can perform a controlled switchover, minimizing risk and business disruption.

• C. Incorrect.

  Option 3 is incorrect because shutting down the on-premises database to copy data files means lengthy downtime. Although manual file transfer can work for smaller or less time-sensitive databases, it does not meet strict minimal downtime requirements.

• D. Incorrect.

  Option 4 is incorrect because re-architecting the application using microservices before migrating the data would be a major overhaul. This could yield benefits long-term but introduces significant development effort and timeline risk, conflicting with the immediate need to minimize downtime.

Correct answer: B

• A. Incorrect.

  Option A is incorrect because a microservices approach would require significant code re-engineering, which conflicts with the requirement to minimize code changes.

• B. Correct.

  Option B is correct. A lift-and-shift migration allows moving existing VMs and the database with minimal modification, fitting the strict downtime window and allowing quick hardware decommissioning. This approach also streamlines the migration process by preserving the existing architecture.

• C. Incorrect.

  Option C is incorrect because refactoring into a serverless architecture demands considerable development effort and testing, which contradicts the requirement to minimize code changes and deliver a quick migration.

• D. Incorrect.

  Option D is incorrect because it introduces a separate DR environment and requires a 72-hour validation period, which is not suitable for the stated one-hour cutover downtime requirement.

Correct answer: B

• A. Incorrect.

  Option 1 is incorrect because using Oracle Data Pump alone for an 8 TB database can result in a long outage. While Data Pump is a reliable tool for data movement, the size of the database and the need for near-zero downtime make it less suitable if you cannot accommodate an extended maintenance window.

• B. Correct.

  Option 2 is correct. Zero Downtime Migration (ZDM) with Oracle Data Guard can continuously replicate changes from the on-premises database to OCI, minimizing downtime to the cutover phase. This approach allows near real-time synchronization, helping ensure availability and data consistency.

• C. Incorrect.

  Option 3 is incorrect because while the Oracle Data Transfer Appliance expedites large data moves, you still need to handle incremental changes separately. The process works well for bulk data shipping but does not inherently guarantee near-zero downtime unless coupled with additional replication mechanisms.

• D. Incorrect.

  Option 4 is incorrect because a purely manual backup and restore process typically demands substantial downtime. After the restore, you would need to apply outstanding transactions and verify data integrity, which does not align with near-zero downtime requirements.

Correct answers: A, C

• A. Correct.

  Correct. Using a robust replication solution like Oracle Data Guard or Oracle ZDM allows real-time or near real-time synchronization of database changes, reducing cutover time and the risk of data inconsistency.

• B. Incorrect.

  Incorrect. A forklift migration that overlooks application and database interdependencies can lead to unexpected downtime or data integrity issues. Proper planning and testing of dependencies is crucial.

• C. Correct.

  Correct. Validating workload performance and functionality in a pre-production environment is a fundamental step to detect and address issues before production cutover, helping to avoid business disruptions.

• D. Incorrect.

  Incorrect. While a change freeze can reduce variables, freezing all development indefinitely is rarely practical. Controlled change management is typically preferred, rather than halting all on-premises development.

Correct answer: A

• A. Correct.

  Correct. Identifying and measuring the workloads, their dependencies, and specific resource requirements is essential to building an effective migration plan. This allows you to determine the right sizing, migration strategy (lift-and-shift or refactor), and plan for performance and availability on OCI.

• B. Incorrect.

  Incorrect. While testing a final cutover is critical, it should occur after the initial workloads and dependencies have been properly mapped and a migration strategy has been chosen. Conducting a final rehearsal without a thorough inventory is premature.

• C. Incorrect.

  Incorrect. Refactoring to microservices is a viable approach for modernization, but immediately containerizing everything before understanding current dependencies can lead to complexity and extended lead times. Proper planning and analysis should come first.

• D. Incorrect.

  Incorrect. Networking is crucial but must be addressed alongside application workloads and data. Focusing solely on replicating network configurations overlooks the complexities of application interdependencies and can lead to performance or availability gaps post-migration.

Correct answers: A, C, E

• A. Correct.

  Correct. Identifying current application dependencies and resource utilization patterns is a critical first step. This helps you design an appropriate migration strategy, minimize downtime, and account for interdependent components.

• B. Incorrect.

  Incorrect. Migrating large, mission-critical systems without testing or a pilot phase can lead to unplanned outages or performance issues. Best practices encourage a phased or pilot approach to validate performance and detect potential issues early.

• C. Correct.

  Correct. Understanding networking, security, and regulatory compliance requirements is essential when designing your cloud environment. Early assessment of these factors ensures your architecture aligns with organizational and industry constraints.

• D. Incorrect.

  Incorrect. Consolidating everything into a single event is risky as it increases the potential impact of failures. Spreading out the migration reduces the overall risk and allows for incremental validation and rollback if needed.

• E. Correct.

  Correct. A phased migration lets you test, optimize, and measure success metrics incrementally, reducing risk and maintaining availability for critical workloads.

Correct answer: B

• A. Incorrect.

  Option 1 is incorrect because a full cutover without a phased approach or pilot can lead to unexpected downtime and complexities that haven't been tested. Best practices recommend phased migrations after careful planning and testing.

• B. Correct.

  Option 2 is correct because performing a pilot migration with a representative subset allows you to test application behavior, performance, and security in OCI before committing the entire workload. This ensures a smoother transition and reduces risk.

• C. Incorrect.

  Option 3 is incorrect because skipping environment testing deprives the organization of crucial validation steps that ensure workloads function correctly in OCI. Testing is vital to verify performance, security, and reliability.

• D. Incorrect.

  Option 4 is incorrect because ignoring security, even if it's considered non-critical, can introduce vulnerabilities. Security should always be an integral part of the migration process, regardless of the perceived priority of each concern.