Quick Answer
The correct solution is to use AWS DMS with change data capture (CDC) to stream changes to Amazon S3. This works because AWS DMS CDC continuously reads the Oracle redo logs on RDS to capture all DML changes—inserts, updates, and deletes—without requiring any additional Oracle-licensed features, then streams those changes as flat files or Parquet into S3 for long-term auditing and analysis. On the AWS Certified Database Specialty DBS-C01 exam, this question tests your understanding of the critical limitation that Amazon RDS does not expose the underlying host or allow Oracle-specific tools like Flashback Query or Audit Vault, which are both unsupported in the managed RDS environment. A common trap is confusing CloudTrail (which logs AWS API calls, not database-level DML) with a true CDC solution. Remember the memory tip: "DMS to S3 for DML" — if you need to audit row-level changes on RDS, think DMS CDC, not Oracle-native features.
This DBS-C01 practice question tests your understanding of workload-specific database design. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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 runs an Oracle database on Amazon RDS. The database is used by multiple applications, and the company needs to capture all data modification language (DML) changes for auditing. Which solution should be used?
Use AWS CloudTrail to capture database events.
Why wrong: CloudTrail captures API calls, not DML.
Enable Oracle Flashback and store the flashback logs.
Why wrong: Flashback is for point-in-time recovery, not auditing.
Install Oracle Audit Vault on the RDS instance.
Why wrong: Audit Vault is not supported on RDS.
Use AWS DMS with change data capture (CDC) to stream changes to Amazon S3.
DMS CDC captures DML changes and can write to S3.
Answer choices
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 change data capture (CDC) to stream changes to Amazon S3.
Option D is correct because AWS DMS with CDC and stream to S3 allows capturing DML changes and storing them for auditing. Option A is wrong because RDS does not support Oracle Flashback. Option B is wrong because RDS does not support Oracle Audit Vault. Option C is wrong because CloudTrail does not capture database-level DML.
Key principle: ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
Use AWS CloudTrail to capture database events.
Why it's wrong here
CloudTrail captures API calls, not DML.
Enable Oracle Flashback and store the flashback logs.
Why it's wrong here
Flashback is for point-in-time recovery, not auditing.
Install Oracle Audit Vault on the RDS instance.
Why it's wrong here
Audit Vault is not supported on RDS.
Use AWS DMS with change data capture (CDC) to stream changes to Amazon S3.
Why this is correct
DMS CDC captures DML changes and can write to S3.
Related concept
Standard ACLs match source addresses.
Common exam traps
ACLs are processed top to bottom. The first matching entry wins, and an implicit deny usually exists at the end.
Detailed technical explanation
ACL questions test precision: source, destination, protocol, port and direction. A generally correct ACL can still fail if it is applied on the wrong interface or in the wrong direction.
Key takeaway
ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.
Real-world example
A media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
What to study next
Review ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related DBS-C01 ACL questions on filtering logic and placement.
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FAQ
Workload-Specific Database Design — This question tests Workload-Specific Database Design — Standard ACLs match source addresses..
The correct answer is: Use AWS DMS with change data capture (CDC) to stream changes to Amazon S3. — Option D is correct because AWS DMS with CDC and stream to S3 allows capturing DML changes and storing them for auditing. Option A is wrong because RDS does not support Oracle Flashback. Option B is wrong because RDS does not support Oracle Audit Vault. Option C is wrong because CloudTrail does not capture database-level DML.
Review ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related DBS-C01 ACL questions on filtering logic and placement.
Standard ACLs match source addresses.
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Last reviewed: Jun 20, 2026
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