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Deployment and Migration →mediumMultiple ChoiceObjective-mapped

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.

A
Disable automated backups to free resources
Why wrong: Disabling automated backups may free some I/O and CPU resources, but the savings are minimal and not the most effective action for reducing CPU utilization in this scenario.
B
Enable Oracle Multitenant architecture
Why wrong: Enabling Oracle Multitenant architecture typically increases CPU overhead due to container management processes and is not a supported or effective way to reduce CPU utilization. RDS also does not allow conversion from non-CDB to CDB after instance creation.
C
Increase the allocated storage to improve IOPS
Increasing allocated storage improves IOPS, which reduces I/O wait times and can significantly lower CPU utilization if the database is I/O-bound. This is often the most straightforward first step.
D
Change the RDS instance to a burstable class
Why wrong: Changing to a burstable instance class (e.g., db.t3) may reduce CPU costs but can lead to CPU credit exhaustion under sustained load, potentially worsening performance and increasing CPU utilization.

Full breakdown with real-world context →

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

✓

Increase the allocated storage to improve IOPS

Increasing allocated storage on Amazon RDS for Oracle directly improves the provisioned IOPS (if using Provisioned IOPS) or baseline IOPS (for gp2/gp3). Higher IOPS reduces I/O wait time, which is a common cause of high CPU utilization when the database is I/O-bound. Query optimization or instance resizing may also help, but increasing storage is a simple, low-risk action that often alleviates I/O-related CPU pressure. Option B is incorrect because Oracle Multitenant (CDB/PDB) architecture adds container management overhead and is not designed to reduce CPU utilization; also, converting an existing non-CDB RDS instance to CDB is not supported.

Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.

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
Disabling automated backups may free some I/O and CPU resources, but the savings are minimal and not the most effective action for reducing CPU utilization in this scenario.
✗
Enable Oracle Multitenant architecture
Why it's wrong here
Enabling Oracle Multitenant architecture typically increases CPU overhead due to container management processes and is not a supported or effective way to reduce CPU utilization. RDS also does not allow conversion from non-CDB to CDB after instance creation.
✓
Increase the allocated storage to improve IOPS
Why this is correct
Increasing allocated storage improves IOPS, which reduces I/O wait times and can significantly lower CPU utilization if the database is I/O-bound. This is often the most straightforward first step.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Change the RDS instance to a burstable class
Why it's wrong here
Changing to a burstable instance class (e.g., db.t3) may reduce CPU costs but can lead to CPU credit exhaustion under sustained load, potentially worsening performance and increasing CPU utilization.

Common exam traps

Common exam trap: answer the scenario, not the keyword

The trap is assuming that CPU utilization is always due to compute limits and overlooking the impact of I/O wait. Candidates may also incorrectly believe Oracle Multitenant reduces CPU, but it actually adds overhead and is not applicable to existing RDS instances.

Trap categories for this question

Scenario analysis trap
Disabling automated backups may free some I/O and CPU resources, but the savings are minimal and not the most effective action for reducing CPU utilization in this scenario.

Detailed technical explanation

How to think about this question

In Oracle Multitenant, the CDB manages shared background processes (e.g., PMON, SMON, CKPT) and the System Global Area (SGA) across multiple PDBs, reducing per-database overhead. On RDS, enabling this architecture can lower CPU consumption by up to 20-30% for identical workloads, as the non-CDB mode runs separate processes for each database instance. This is particularly beneficial during migrations where the on-premises database may have been running in a containerized or virtualized environment with similar efficiencies.

KKey Concepts to Remember

Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.

TExam Day Tips

Watch for words such as best, first, most likely and least administrative effort.
Review why wrong options are wrong, not only why the correct option is correct.

Key takeaway

Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.

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.

Quick reference

AWS S3 Storage Class Comparison

Storage Class	Min Duration	Retrieval	Use Case
S3 Standard	None	Immediate	Frequently accessed data
S3 Standard-IA	30 days	Immediate	Infrequent access, rapid retrieval
S3 One Zone-IA	30 days	Immediate	Non-critical infrequent data
S3 Intelligent-Tiering	None	Immediate–hours	Unknown or changing access patterns
S3 Glacier Instant	90 days	Milliseconds	Archive with instant retrieval
S3 Glacier Flexible	90 days	Minutes–hours	Archive, flexible retrieval
S3 Glacier Deep Archive	180 days	Hours	Long-term compliance archive

What to study next

Got this wrong? Here's your next step.

Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.

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FAQ

Questions learners often ask

What does this DBS-C01 question test?

Deployment and Migration — This question tests Deployment and Migration — Read the scenario before looking for a memorised answer..

What is the correct answer to this question?

The correct answer is: Increase the allocated storage to improve IOPS — Increasing allocated storage on Amazon RDS for Oracle directly improves the provisioned IOPS (if using Provisioned IOPS) or baseline IOPS (for gp2/gp3). Higher IOPS reduces I/O wait time, which is a common cause of high CPU utilization when the database is I/O-bound. Query optimization or instance resizing may also help, but increasing storage is a simple, low-risk action that often alleviates I/O-related CPU pressure. Option B is incorrect because Oracle Multitenant (CDB/PDB) architecture adds container management overhead and is not designed to reduce CPU utilization; also, converting an existing non-CDB RDS instance to CDB is not supported.

What should I do if I get this DBS-C01 question wrong?

Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.

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?

Read the scenario before looking for a memorised answer.

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