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Deployment and Migration →hardMultiple ChoiceObjective-mapped

DBS-C01 Deployment and Migration Practice Question

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 2 TB on-premises Microsoft SQL Server database to Amazon RDS for SQL Server. The migration must have minimal downtime. The company uses AWS DMS with ongoing CDC. During the full load phase, the DMS task fails with an error indicating that the source table 'Orders' has a large number of LOB columns and the task is running out of memory. The DMS replication instance is a dms.c4.large with 4 GB RAM. The company needs to complete the migration successfully. What should the company do?

A
Set the LOB chunk size to 64 KB in the task settings.
Why wrong: Setting the LOB chunk size to 64 KB may reduce memory consumption per LOB column but is unlikely to resolve the out-of-memory error because the total memory on the instance is still 4 GB; increasing instance size is more effective.
B
Increase the replication instance size to dms.c4.xlarge (8 GB RAM).
Increasing the replication instance size to dms.c4.xlarge (8 GB RAM) directly addresses the memory shortage by providing more memory to handle large LOB columns during full load.
C
Split the 'Orders' table into multiple DMS tasks running in parallel.
Why wrong: Splitting the table into multiple DMS tasks does not reduce memory usage per task; it could increase overall memory consumption and does not solve the memory constraint on the instance.
D
Change the DMS task settings to disable LOB support for the 'Orders' table.
Why wrong: Disabling LOB support would cause DMS to truncate LOB data to 1024 bytes by default, resulting in data loss, which is unacceptable for a migration requiring minimal downtime.

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 replication instance size to dms.c4.xlarge (8 GB RAM).

Option B is correct because increasing the replication instance size provides more memory to handle LOB columns during the full load phase. Option A is incorrect because setting the LOB chunk size to 64 KB may reduce memory consumption per LOB but might not be sufficient to resolve the out-of-memory error; increasing instance size is a more direct solution. Option C is incorrect because splitting the table into multiple tasks does not address the underlying memory constraint; it could even increase memory usage due to multiple tasks running simultaneously. Option D is incorrect because disabling LOB support would truncate LOB data, leading to data loss.

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.

✗
Set the LOB chunk size to 64 KB in the task settings.
Why it's wrong here
Setting the LOB chunk size to 64 KB may reduce memory consumption per LOB column but is unlikely to resolve the out-of-memory error because the total memory on the instance is still 4 GB; increasing instance size is more effective.
✓
Increase the replication instance size to dms.c4.xlarge (8 GB RAM).
Why this is correct
Increasing the replication instance size to dms.c4.xlarge (8 GB RAM) directly addresses the memory shortage by providing more memory to handle large LOB columns during full load.
Related concept
Read the scenario before looking for a memorised answer.
✗
Split the 'Orders' table into multiple DMS tasks running in parallel.
Why it's wrong here
Splitting the table into multiple DMS tasks does not reduce memory usage per task; it could increase overall memory consumption and does not solve the memory constraint on the instance.
✗
Change the DMS task settings to disable LOB support for the 'Orders' table.
Why it's wrong here
Disabling LOB support would cause DMS to truncate LOB data to 1024 bytes by default, resulting in data loss, which is unacceptable for a migration requiring minimal downtime.

Common exam traps

Common exam trap: answer the scenario, not the keyword

Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.

Detailed technical explanation

How to think about this question

This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.

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.
Use explanations to understand the rule behind the answer.

TExam Day Tips

Underline the problem statement mentally.
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 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. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.

Visual reference

What to study next

Got this wrong? Here's your next step.

Identify which DBS-C01 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.

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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 replication instance size to dms.c4.xlarge (8 GB RAM). — Option B is correct because increasing the replication instance size provides more memory to handle LOB columns during the full load phase. Option A is incorrect because setting the LOB chunk size to 64 KB may reduce memory consumption per LOB but might not be sufficient to resolve the out-of-memory error; increasing instance size is a more direct solution. Option C is incorrect because splitting the table into multiple tasks does not address the underlying memory constraint; it could even increase memory usage due to multiple tasks running simultaneously. Option D is incorrect because disabling LOB support would truncate LOB data, leading to data loss.

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

What is the key concept behind this question?

Read the scenario before looking for a memorised answer.

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This DBS-C01 practice question is part of Courseiva's free Amazon Web Services certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the DBS-C01 exam.