- A
Increase the number of DMS task mappings (parallel threads)
More threads can process data in parallel, speeding up full load.
- B
Reduce the target RDS instance storage to minimize write latency
Why wrong: Storage size does not directly affect write speed.
- C
Increase the size of the source on-premises database instance
Why wrong: Source performance does not affect DMS throughput directly.
- D
Disable LOB columns in the task settings
Why wrong: Disabling LOBs may cause data loss if LOBs are present.
Question 601 of 1,730
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 an on-premises MySQL database to Amazon RDS for MySQL. The database has a table with 100 million rows. During the migration using AWS DMS, the full load phase is taking too long. What change can speed up the full load?
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 number of DMS task mappings (parallel threads)
Increasing the number of DMS task mappings (parallel threads) allows DMS to partition the source table and load multiple segments concurrently, significantly reducing the full load duration. By default, DMS uses a single thread per table; adding parallel threads leverages the source database's read capacity and the target RDS instance's write throughput more efficiently.
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.
- ✓
Increase the number of DMS task mappings (parallel threads)
Why this is correct
More threads can process data in parallel, speeding up full load.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Reduce the target RDS instance storage to minimize write latency
Why it's wrong here
Storage size does not directly affect write speed.
- ✗
Increase the size of the source on-premises database instance
Why it's wrong here
Source performance does not affect DMS throughput directly.
- ✗
Disable LOB columns in the task settings
Why it's wrong here
Disabling LOBs may cause data loss if LOBs are present.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The DBS-C01 exam often tests the misconception that increasing source or target instance size is the primary lever for migration speed, when in fact DMS's parallelism settings directly control concurrency and are the most impactful change for full load performance.
Detailed technical explanation
How to think about this question
DMS uses a 'parallel load' feature where you can specify the number of subtasks (mappings) for a table, each reading a distinct range of rows using a column like a primary key or a timestamp. Under the hood, DMS issues multiple SELECT statements with WHERE clauses (e.g., `WHERE id BETWEEN 1 AND 1000000`) to partition the data, and each thread writes independently to the target, maximizing network and I/O utilization. In real-world scenarios, if the source table lacks a suitable partition key (e.g., no primary key), DMS falls back to a single thread, making this optimization ineffective.
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.
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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Deployment and Migration — study guide chapter
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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 number of DMS task mappings (parallel threads) — Increasing the number of DMS task mappings (parallel threads) allows DMS to partition the source table and load multiple segments concurrently, significantly reducing the full load duration. By default, DMS uses a single thread per table; adding parallel threads leverages the source database's read capacity and the target RDS instance's write throughput more efficiently.
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.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jul 4, 2026
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.
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