DBS-C01 Deployment and Migration Practice Question
A company is migrating a 2 TB Oracle database from on-premises to Amazon RDS for Oracle. The network bandwidth is 100 Mbps. The migration must be completed within 3 days. Which approach is MOST efficient?
⚠ Common exam trap
A common mix-up: candidates assume Oracle-native tools like RMAN or Data Pump are always the best for migrations, but they overlook the bandwidth constraint and RDS's lack of direct OS access, making DMS the only viable option for a time-bound, large-scale migration with minimal downtime.
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 AWS DMS with parallel load and ongoing replication.
AWS DMS with parallel load and ongoing replication is the most efficient approach because it can handle the 2 TB migration within the 3-day window over a 100 Mbps link. At 100 Mbps, the theoretical maximum transfer is about 1.08 TB per day (100 Mbps * 86400 seconds / 8 bits per byte / 1024^4), so 2 TB would take nearly 2 days just for the full load. DMS's parallel load splits the data into multiple tasks, maximizing throughput and reducing the full-load time, while ongoing replication captures changes during the migration, allowing a seamless cutover without downtime.
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 DMS with parallel load and ongoing replication.
Why this is correct
DMS parallel load reduces migration time.
- ✗
Use Oracle RMAN to create a backup and restore to RDS.
Why it's wrong here
Backup transfer over 100 Mbps may exceed 3 days.
- ✗
Use Oracle Data Pump with a single export and import.
Why it's wrong here
Single-threaded export/import may be too slow.
- ✗
Use Oracle GoldenGate for real-time replication.
Why it's wrong here
GoldenGate adds complexity and cost.
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