DBS-C01 Management and Operations Practice Question
A company is migrating its on-premises Oracle database to Amazon RDS for Oracle. The database is 2 TB in size and contains both transactional and analytical workloads. The company uses Oracle Data Pump for migration. During the migration, the database specialist notices that the export job on the source database is taking longer than expected and is generating significant I/O, impacting production performance. The company needs to minimize the impact on the source database while completing the migration within a 48-hour window. The source database is currently running on a dedicated server with sufficient CPU and memory. Which course of action should the database specialist take?
⚠ Common exam trap
A common mix-up: candidates assume increasing parallelism (Option D) is always the best way to speed up a Data Pump job, but they overlook that the primary issue is I/O impact on production, not throughput, and that network_link mode eliminates the I/O bottleneck entirely.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use Oracle Data Pump in network_link mode to directly import the data from the source to the target RDS instance without intermediate files.
Oracle Data Pump's network_link mode allows the source database to export data directly to the target RDS for Oracle instance over a database link, bypassing the need to write intermediate dump files to disk. This eliminates the I/O overhead on the source server's storage subsystem, which is the primary cause of the production performance impact, while still completing the migration within the 48-hour window.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Use AWS Database Migration Service (AWS DMS) with full load and change data capture (CDC) to migrate the database.
Why it's wrong here
Incorrect: DMS also reads from the source, causing similar I/O.
- ✗
Use Data Pump to export to a networked file system (NFS) mount point to offload storage I/O to the network.
Why it's wrong here
Incorrect: NFS still requires writing to the source filesystem, causing I/O.
- ✓
Use Oracle Data Pump in network_link mode to directly import the data from the source to the target RDS instance without intermediate files.
Why this is correct
Correct: This minimizes source I/O as data is transferred directly.
- ✗
Increase the parallel workers for the Data Pump export job to 8 to speed up the export and reduce the time window.
Why it's wrong here
Incorrect: More parallelism increases I/O, exacerbating source impact.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This DBS-C01 practice question is part of Courseiva's free Amazon Web Services certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the DBS-C01 exam.