1Z0-997-25 Question 149
Select 2Your organization is migrating a large on-premises Oracle Database to Oracle Exadata Cloud Infrastructure using Zero Downtime Migration (ZDM). The migration strategy involves incremental RMAN backups sent over the network. Near the final incremental backup phase, the process begins to run significantly slower than expected. Which two actions should you take to troubleshoot and address this performance issue?
- A
Enable location-based restrictions in ZDM to prevent long-distance transfers
- B
Check the RMAN logs and configure sufficient parallelization for the incremental backup
- C
Stop using incremental backups and switch to a full export/import with Data Pump immediately
- D
Evaluate network throughput and check for bandwidth saturation between the source and target
- E
Force a switchover to Oracle Data Guard at this stage to complete the migration more quickly
Show answer and explanation
Correct answers: B, D
Explanation
When using Zero Downtime Migration (ZDM) and RMAN-based incremental backups, performance bottlenecks often arise from inadequate parallelization settings or network constraints. Optimizing RMAN parallelization and ensuring adequate network throughput are standard best practices per Oracle documentation. Refer to Oracle ZDM and RMAN tuning guidelines to troubleshoot and mitigate slow incremental backup performance.
- A. Incorrect.
Option 1: Incorrect. Location-based restrictions could block or restrict traffic, but they do not address the performance bottleneck itself. Disabling or enabling location-based restrictions is unrelated to performance tuning in this final backup phase.
- B. Correct.
Option 2: Correct. Reviewing the RMAN logs helps identify if parallelization is set too low, which can prolong incremental backups. Increasing parallelization can significantly improve backup performance and reduce overall migration time.
- C. Incorrect.
Option 3: Incorrect. Switching to a full export/import with Data Pump at this late stage would typically involve more downtime and additional overhead. Incremental backups are usually more efficient and are part of the recommended Zero Downtime Migration approach for minimal downtime.
- D. Correct.
Option 4: Correct. Network bandwidth can be a common bottleneck. Evaluating link utilization and potential network congestion is critical. If bandwidth is saturated or network latency is high, it directly slows down incremental backup transfers.
- E. Incorrect.
Option 5: Incorrect. Forcing a switchover to Oracle Data Guard at this final phase is not the recommended solution for performance bottlenecks in an RMAN-based ZDM approach. Data Guard switchover is separate from incremental backup performance tuning.