Quick Answer
The correct first step is to enable supplemental logging on the Oracle source database for the 'ORDERS' table. AWS DMS with Change Data Capture (CDC) relies on Oracle redo logs to capture ongoing changes, and table-level supplemental logging ensures that the necessary before-and-after images of row changes are recorded in those logs; without it, DMS cannot reconstruct the logical change records needed for continuous replication. On the AWS Certified Database Specialty DBS-C01 exam, this scenario tests your understanding of DMS prerequisites for Oracle CDC migrations, often appearing as a trap where candidates might restart the task or switch tools instead of fixing the underlying log configuration. A common memory tip is to think of supplemental logging as the "missing ingredient" that DMS needs to read the redo recipe—without it, the CDC engine is blind to changes. Remember the mnemonic "Log First, Migrate Last" to prioritize enabling supplemental logging before any DMS task creation.
This DBS-C01 practice question tests your understanding of deployment and migration. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A company is migrating a 3 TB Oracle database from on-premises to Amazon RDS for Oracle. The migration must have zero downtime. The on-premises server uses Oracle Data Guard for disaster recovery. The network bandwidth is 200 Mbps. The team plans to use AWS DMS with CDC from Oracle redo logs. During the initial full load, DMS reports that the source table 'ORDERS' has a table-level supplemental log missing. The migration fails. What should the team do first to resolve this issue?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "first"
Why it matters: Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
Switch to Oracle GoldenGate for migration.
Why wrong: Additional cost and complexity; not necessary.
Use AWS SCT to convert the schema and then use a native export/import.
Why wrong: Would cause downtime.
Enable supplemental logging on the Oracle source database for the 'ORDERS' table.
Required for DMS CDC to capture changes.
Recreate the DMS task with 'full load only' to bypass CDC.
Why wrong: Would not achieve zero downtime.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Enable supplemental logging on the Oracle source database for the 'ORDERS' table.
Option B is correct: the missing supplemental log prevents DMS from capturing changes. Option A is wrong because re-creating the task without fixing the log will fail again. Option C is wrong because using a different tool may not address the root cause. Option D is wrong because disabling CDC would cause downtime.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
Switch to Oracle GoldenGate for migration.
Why it's wrong here
Additional cost and complexity; not necessary.
Use AWS SCT to convert the schema and then use a native export/import.
Why it's wrong here
Would cause downtime.
Enable supplemental logging on the Oracle source database for the 'ORDERS' table.
Why this is correct
Required for DMS CDC to capture changes.
Clue confirmation
The clue word "first" in the question point toward this answer.
Related concept
Static NAT maps one inside address to one outside address.
Recreate the DMS task with 'full load only' to bypass CDC.
Why it's wrong here
Would not achieve zero downtime.
Common exam traps
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Detailed technical explanation
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Real-world example
A healthcare organisation deploys an application with a public-facing web tier and a private database tier. The database subnet has no public IP and only accepts connections from the web tier's security group. Questions like this test whether you can design cloud network isolation using VNets/VPCs, subnets, and security group rules.
What to study next
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related DBS-C01 NAT questions on configuration and troubleshooting.
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FAQ
Deployment and Migration — This question tests Deployment and Migration — Static NAT maps one inside address to one outside address..
The correct answer is: Enable supplemental logging on the Oracle source database for the 'ORDERS' table. — Option B is correct: the missing supplemental log prevents DMS from capturing changes. Option A is wrong because re-creating the task without fixing the log will fail again. Option C is wrong because using a different tool may not address the root cause. Option D is wrong because disabling CDC would cause downtime.
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related DBS-C01 NAT questions on configuration and troubleshooting.
Yes — watch for: "first". Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
Static NAT maps one inside address to one outside address.
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Last reviewed: Jun 20, 2026
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