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Question 1,073 of 1,730

Deployment and Migration →hardMultiple ChoiceObjective-mapped

Troubleshooting AWS DMS MySQL Replication: Enable Binary Logging

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 5 TB MySQL database to Amazon Aurora MySQL. The migration must have zero downtime and the source database is continuously written to. The team plans to use AWS DMS with ongoing replication. However, they notice that the target Aurora instance is not receiving all changes from the source. Which configuration change is most likely required to resolve this?

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
Create an Amazon RDS read replica of the source database and use it as the source endpoint.
Why wrong: DMS can use a read replica as source, but the issue is likely not about source endpoint type.
B
Set the target table preparation mode to 'Do nothing' in the DMS task.
Why wrong: This affects how target tables are handled before load, not ongoing replication capture.
C
Enable binary logging (binlog) on the source MySQL database with row-based logging.
DMS needs binlogs for ongoing replication; if not enabled, it cannot capture changes.
D
Configure a VPC endpoint for the DMS replication instance.
Why wrong: VPC endpoints are not required for DMS; DMS connects via the replication instance's network.

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

✓

Enable binary logging (binlog) on the source MySQL database with row-based logging.

AWS DMS requires binary logging (binlog) with row-based logging on the source MySQL database to capture ongoing changes for continuous replication. Without binlog enabled, DMS cannot read the change data stream needed to replicate transactions to the target Aurora instance, causing missed changes. This is a mandatory prerequisite for any MySQL-to-Aurora migration using DMS with ongoing replication.

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.

✗
Create an Amazon RDS read replica of the source database and use it as the source endpoint.
Why it's wrong here
DMS can use a read replica as source, but the issue is likely not about source endpoint type.
✗
Set the target table preparation mode to 'Do nothing' in the DMS task.
Why it's wrong here
This affects how target tables are handled before load, not ongoing replication capture.
✓
Enable binary logging (binlog) on the source MySQL database with row-based logging.
Why this is correct
DMS needs binlogs for ongoing replication; if not enabled, it cannot capture changes.
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.
✗
Configure a VPC endpoint for the DMS replication instance.
Why it's wrong here
VPC endpoints are not required for DMS; DMS connects via the replication instance's network.

Common exam traps

Common exam trap: answer the scenario, not the keyword

The trap here is that candidates may overlook the fundamental prerequisite of binary logging for DMS ongoing replication and instead focus on network connectivity (VPC endpoints) or task configuration settings that do not address the root cause of missing change capture.

Detailed technical explanation

How to think about this question

MySQL binary logging with row-based format records every row change (insert, update, delete) in a binary log file, which DMS reads as a replication slave to apply changes to the target. Without binlog, DMS falls back to table-level scans for ongoing replication, which is not supported for continuous change capture and leads to missed transactions. In real-world scenarios, failing to enable binlog is the most common reason for DMS replication lag or data loss during MySQL migrations.

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 healthcare organisation deploys an application with a public-facing web tier and a private database tier. The database subnet has no public IP and only accepts connections from the web tier's security group. Questions like this test whether you can design cloud network isolation using VNets/VPCs, subnets, and security group rules.

Visual reference

What to study next

Got this wrong? Here's your next step.

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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: Enable binary logging (binlog) on the source MySQL database with row-based logging. — AWS DMS requires binary logging (binlog) with row-based logging on the source MySQL database to capture ongoing changes for continuous replication. Without binlog enabled, DMS cannot read the change data stream needed to replicate transactions to the target Aurora instance, causing missed changes. This is a mandatory prerequisite for any MySQL-to-Aurora migration using DMS with ongoing replication.

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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