DBS-C01 Deployment and Migration Practice Question
A company is migrating a 5 TB Oracle database to Amazon RDS for Oracle. The database has several large tables with LOB columns. The migration must have minimal downtime. Which approach should be taken?
⚠ Common exam trap
Many candidates choose Oracle GoldenGate (Option A) because it is a well-known replication tool, but the exam expects you to recognize that AWS DMS is the native, fully managed service designed for minimal-downtime migrations to RDS, and GoldenGate introduces unnecessary complexity and cost.
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 LOB support and ongoing replication from Oracle to RDS.
AWS DMS with LOB support and ongoing replication (change data capture, CDC) is the correct approach because it enables a near-zero downtime migration by continuously replicating changes from the source Oracle database to Amazon RDS for Oracle after an initial full load. DMS handles large LOB columns efficiently using its 'Full LOB mode' or 'Limited LOB mode' settings, which are critical for tables with LOB data. The combination of full load + CDC ensures minimal downtime, as the target remains synchronized until cutover.
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 Oracle GoldenGate to replicate data to RDS.
Why it's wrong here
While GoldenGate can work, it requires additional licensing and complexity; AWS DMS is the recommended service.
- ✓
Use AWS DMS with LOB support and ongoing replication from Oracle to RDS.
Why this is correct
AWS DMS supports LOBs and can replicate changes continuously, minimizing downtime.
- ✗
Use Oracle Data Pump to export the database and import into RDS.
Why it's wrong here
Data Pump is an offline method that would cause significant downtime for a 5 TB database.
- ✗
Copy the database files to Amazon S3 and use the rdsadmin.rds_restore_from_s3 procedure.
Why it's wrong here
RDS for Oracle does not support restoring from S3 directly.
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