The answer is enabling Oracle Multitenant architecture, as this directly reduces RDS CPU utilization after migration by consolidating multiple databases into a single container database, which minimizes background process overhead and memory management costs that are typically higher in a non-CDB environment. On the AWS Certified Database Specialty DBS-C01 exam, this question tests your understanding of Oracle-specific optimization features available on RDS, and the common trap is assuming that resizing the instance or storage will fix CPU issues—when in fact the root cause is often the architectural overhead of running a standalone database. Remember that after a migration, CPU spikes frequently stem from inefficient resource sharing, not from insufficient hardware. A useful memory tip: think of Multitenant as “one engine, many cabins”—it reduces the number of separate processes fighting for CPU, unlike a non-CDB where each database runs its own heavy background processes.
DBS-C01 Deployment and Migration Practice Question
This DBS-C01 practice question tests your understanding of deployment and migration. 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 is migrating a 2 TB Oracle database from on-premises to Amazon RDS for Oracle using AWS DMS. The migration completes successfully, but the new RDS instance shows higher CPU utilization than the on-premises database for the same workload. Which action is MOST likely to reduce CPU utilization on RDS?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Enable Oracle Multitenant architecture
Option A is correct because enabling Oracle Multitenant reduces overhead by consolidating containers. Option B is wrong because RDS does not allow direct instance type change without downtime. Option C is wrong because increasing storage does not directly reduce CPU. Option D is wrong because disabling backups is not recommended and may not be the cause.
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
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
Disable automated backups to free resources
Why it's wrong here
Backups have minimal CPU impact and disabling them is not a standard recommendation.
✓
Enable Oracle Multitenant architecture
Why this is correct
Multitenant reduces resource overhead by running multiple PDBs in a single CDB.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Standard ACLs match source addresses.
✗
Increase the allocated storage to improve IOPS
Why it's wrong here
Storage increase does not directly reduce CPU utilization.
✗
Change the RDS instance to a burstable class
Why it's wrong here
Burstable instances may not provide consistent performance and could increase CPU credits usage.
Common exam traps
Common exam trap: ACLs stop at the first match
ACLs are processed top to bottom. The first matching entry wins, and an implicit deny usually exists at the end.
Detailed technical explanation
How to think about this question
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.
KKey Concepts to Remember
Standard ACLs match source addresses.
Extended ACLs can match source, destination, protocol and ports.
The first matching ACL entry is used.
There is usually an implicit deny at the end.
TExam Day Tips
→Check inbound versus outbound direction.
→Read the ACL from top to bottom.
→Look for a broader permit or deny above the intended line.
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
How this comes up in practice
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
Got this wrong? Here's your next step.
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.
Deployment and Migration — This question tests Deployment and Migration — Standard ACLs match source addresses..
What is the correct answer to this question?
The correct answer is: Enable Oracle Multitenant architecture — Option A is correct because enabling Oracle Multitenant reduces overhead by consolidating containers. Option B is wrong because RDS does not allow direct instance type change without downtime. Option C is wrong because increasing storage does not directly reduce CPU. Option D is wrong because disabling backups is not recommended and may not be the cause.
What should I do if I get this DBS-C01 question wrong?
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.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
What is the key concept behind this question?
Standard ACLs match source addresses.
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Question Discussion
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