DBS-C01 Workload-Specific Database Design Practice Question
This DBS-C01 practice question tests your understanding of workload-specific database design. 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 to Amazon Aurora PostgreSQL. The database has a heavy OLTP workload with many small transactions. The migration must have minimal downtime. Which TWO strategies should the company use? (Choose two.)
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 ongoing replication to capture and apply changes.
Options A and D are correct. AWS DMS with ongoing replication allows minimal downtime by replicating changes from Oracle to Aurora. Using Aurora PostgreSQL provides better compatibility with Oracle via the Babelfish feature? Actually, Babelfish is for SQL Server, not Oracle. But Aurora PostgreSQL supports many Oracle features. Option B is wrong because SCT helps assess but doesn't handle ongoing replication. Option C is wrong because converting to Aurora MySQL would require additional compatibility changes. Option E is wrong because a read replica cannot be created from Oracle.
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
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
Convert the database to Amazon Aurora MySQL instead.
Why it's wrong here
Would still require migration; Aurora PostgreSQL is more compatible.
✗
Create an Aurora read replica from the Oracle database.
Why it's wrong here
Aurora read replicas cannot be created from external databases.
✓
Use AWS DMS with ongoing replication to capture and apply changes.
Why this is correct
Provides minimal downtime by replicating changes continuously.
Related concept
Static NAT maps one inside address to one outside address.
✗
Use AWS Schema Conversion Tool (SCT) to convert the schema.
Why it's wrong here
SCT converts schema but does not handle data replication.
✓
Set the target database to Amazon Aurora PostgreSQL.
Why this is correct
Aurora PostgreSQL is the target for migration from Oracle.
Related concept
Static NAT maps one inside address to one outside address.
Common exam traps
Common exam trap: NAT rules depend on direction and matching traffic
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
How to think about this question
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.
KKey Concepts to Remember
Static NAT maps one inside address to one outside address.
PAT allows many inside hosts to share one public address using ports.
Inside local and inside global describe the private and translated addresses.
NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
→Identify inside and outside interfaces first.
→Check whether the scenario needs static NAT, dynamic NAT or PAT.
→Do not confuse NAT matching ACLs with normal packet-filtering intent.
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
How this comes up in practice
A cloud solutions architect for a retail company is evaluating services for a new workload. The correct answer here reflects best practice for the specific scenario described — not a general cloud recommendation. NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.
What to study next
Got this wrong? Here's your next step.
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.
Workload-Specific Database Design — This question tests Workload-Specific Database Design — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: Use AWS DMS with ongoing replication to capture and apply changes. — Options A and D are correct. AWS DMS with ongoing replication allows minimal downtime by replicating changes from Oracle to Aurora. Using Aurora PostgreSQL provides better compatibility with Oracle via the Babelfish feature? Actually, Babelfish is for SQL Server, not Oracle. But Aurora PostgreSQL supports many Oracle features. Option B is wrong because SCT helps assess but doesn't handle ongoing replication. Option C is wrong because converting to Aurora MySQL would require additional compatibility changes. Option E is wrong because a read replica cannot be created from Oracle.
What should I do if I get this DBS-C01 question wrong?
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.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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Question Discussion
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