- A
Use a smaller DMS replication instance to reduce costs.
Why wrong: Using a smaller DMS replication instance reduces compute and memory resources, which slows the migration. This would not improve speed.
- B
Use a Multi-AZ deployment for the DMS replication instance in the target region.
Why wrong: Multi-AZ deployment is for high availability and failover, not for performance. It does not improve migration speed and may add overhead.
- C
Increase the number of parallel tables being migrated.
Increasing the number of parallel tables allows DMS to migrate multiple tables at once, utilizing more of the available bandwidth and reducing total migration time, especially for a large database.
- D
Disable binary logging on the source MySQL database.
Why wrong: Disabling binary logging on the source MySQL database prevents ongoing replication and can cause data loss or require a full re-sync if the migration needs to be resumed. It does not speed up the initial load.
DEA-C01 AWS DMS Parallel Tables Practice Question
This DEA-C01 practice question tests your understanding of data ingestion and transformation. 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. A key principle to apply: aWS DMS Parallel Tables. 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 using AWS Database Migration Service (DMS) to migrate a 2 TB MySQL database to Amazon Aurora MySQL. The migration is taking longer than expected. The source database is in a different AWS region. Which change would MOST likely improve the migration speed?
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 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 parallel tables being migrated.
Increasing the number of parallel tables allows DMS to migrate multiple tables simultaneously, leveraging available bandwidth and reducing overall migration time. This is particularly effective for large databases (2 TB) where serial migration would be slow. Option B is incorrect because Multi-AZ provides high availability, not performance improvement; it adds overhead and does not reduce network latency. Option A reduces resources, making migration slower. Option D disables binary logging, which is needed for ongoing replication and can cause data loss or require a full re-sync.
Key principle: AWS DMS Parallel Tables
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Use a smaller DMS replication instance to reduce costs.
Why it's wrong here
Using a smaller DMS replication instance reduces compute and memory resources, which slows the migration. This would not improve speed.
- ✗
Use a Multi-AZ deployment for the DMS replication instance in the target region.
Why it's wrong here
Multi-AZ deployment is for high availability and failover, not for performance. It does not improve migration speed and may add overhead.
- ✓
Increase the number of parallel tables being migrated.
Why this is correct
Increasing the number of parallel tables allows DMS to migrate multiple tables at once, utilizing more of the available bandwidth and reducing total migration time, especially for a large database.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
AWS DMS Parallel Tables
- ✗
Disable binary logging on the source MySQL database.
Why it's wrong here
Disabling binary logging on the source MySQL database prevents ongoing replication and can cause data loss or require a full re-sync if the migration needs to be resumed. It does not speed up the initial load.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Candidates often confuse Multi-AZ with performance improvement, but Multi-AZ is solely for high availability. For cross-region migrations, the bottleneck is network bandwidth; increasing parallelism is the most effective way to improve throughput.
Detailed technical explanation
How to think about this question
Treat this as a scenario question. Identify the problem, the constraint, and the best action. Then compare each option against those facts.
KKey Concepts to Remember
- AWS DMS Parallel Tables
- Cross-Region Migration Bottleneck
- Multi-AZ
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
AWS DMS Parallel Tables
Real-world example
How this comes up in practice
A startup's cloud architect reviews their monthly bill and notices costs are higher than expected for a long-running batch job. Switching from on-demand instances to Reserved Instances — or using Spot/Preemptible VMs — can reduce compute costs by up to 72 %. Questions like this test whether you understand the tradeoffs between commitment, flexibility, and cost across cloud pricing models.
What to study next
Got this wrong? Here's your next step.
Review aWS DMS Parallel Tables, then practise related DEA-C01 questions on the same topic to reinforce the concept.
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FAQ
Questions learners often ask
What does this DEA-C01 question test?
Data Ingestion and Transformation — This question tests Data Ingestion and Transformation — AWS DMS Parallel Tables.
What is the correct answer to this question?
The correct answer is: Increase the number of parallel tables being migrated. — Increasing the number of parallel tables allows DMS to migrate multiple tables simultaneously, leveraging available bandwidth and reducing overall migration time. This is particularly effective for large databases (2 TB) where serial migration would be slow. Option B is incorrect because Multi-AZ provides high availability, not performance improvement; it adds overhead and does not reduce network latency. Option A reduces resources, making migration slower. Option D disables binary logging, which is needed for ongoing replication and can cause data loss or require a full re-sync.
What should I do if I get this DEA-C01 question wrong?
Review aWS DMS Parallel Tables, then practise related DEA-C01 questions on the same topic to reinforce the concept.
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?
AWS DMS Parallel Tables
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Last reviewed: Jun 20, 2026
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