- A
Enable 'BatchApplyEnabled' and set 'TaskRecoveryTableEnabled' to false in the task settings.
Batch apply minimizes duplicate key errors, and disabling recovery table prevents re-application of already-applied changes.
- B
Disable the unique constraint on the target table.
Why wrong: Disabling constraints compromises data integrity.
- C
Truncate the target table and restart the full load.
Why wrong: Truncating would lose data and require a full reload, which is disruptive.
- D
Drop the indexes on the target table and recreate them after the migration.
Why wrong: Indexes are not the cause of duplicate key violations; constraints are.
Question 139 of 1,786
DEA-C01 AWS DMS BatchApplyEnabled Practice Question
This DEA-C01 practice question tests your understanding of data operations and support. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. A key principle to apply: aWS DMS BatchApplyEnabled. 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 data engineer is using AWS DMS to migrate a 2 TB Oracle database to Amazon Aurora PostgreSQL. The migration is running in full load mode with ongoing replication. After the full load completes, the ongoing replication task shows a 'TargetMetadata' error: 'ERROR: duplicate key value violates unique constraint'. The engineer verifies that the target table already contains the data. What should the engineer do to resolve this issue?
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 'BatchApplyEnabled' and set 'TaskRecoveryTableEnabled' to false in the task settings.
Option A is correct because enabling 'BatchApplyEnabled' allows DMS to batch changes and reduces duplicate key errors, while setting 'TaskRecoveryTableEnabled' to false prevents recovery attempts that can reapply already committed transactions. Option B is wrong because disabling constraints compromises data integrity. Option C is wrong because truncating and restarting loses existing data and does not address the ongoing replication issue. Option D is wrong because dropping indexes does not prevent duplicate key violations.
Key principle: AWS DMS BatchApplyEnabled
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Enable 'BatchApplyEnabled' and set 'TaskRecoveryTableEnabled' to false in the task settings.
Why this is correct
Batch apply minimizes duplicate key errors, and disabling recovery table prevents re-application of already-applied changes.
Related concept
AWS DMS BatchApplyEnabled
- ✗
Disable the unique constraint on the target table.
Why it's wrong here
Disabling constraints compromises data integrity.
- ✗
Truncate the target table and restart the full load.
Why it's wrong here
Truncating would lose data and require a full reload, which is disruptive.
- ✗
Drop the indexes on the target table and recreate them after the migration.
Why it's wrong here
Indexes are not the cause of duplicate key violations; constraints are.
Common exam traps
Common exam trap: answer the scenario, not the keyword
A common mistake is to think that truncating the target table is necessary, but that would cause data loss and downtime. Another mistake is to disable constraints, which can lead to data integrity issues.
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 BatchApplyEnabled
- AWS DMS TaskRecoveryTableEnabled
- Full load + ongoing replication
- Duplicate key violation in DMS
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 BatchApplyEnabled
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. AWS DMS BatchApplyEnabled 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.
Review aWS DMS BatchApplyEnabled, 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 Operations and Support — This question tests Data Operations and Support — AWS DMS BatchApplyEnabled.
What is the correct answer to this question?
The correct answer is: Enable 'BatchApplyEnabled' and set 'TaskRecoveryTableEnabled' to false in the task settings. — Option A is correct because enabling 'BatchApplyEnabled' allows DMS to batch changes and reduces duplicate key errors, while setting 'TaskRecoveryTableEnabled' to false prevents recovery attempts that can reapply already committed transactions. Option B is wrong because disabling constraints compromises data integrity. Option C is wrong because truncating and restarting loses existing data and does not address the ongoing replication issue. Option D is wrong because dropping indexes does not prevent duplicate key violations.
What should I do if I get this DEA-C01 question wrong?
Review aWS DMS BatchApplyEnabled, then practise related DEA-C01 questions on the same topic to reinforce the concept.
What is the key concept behind this question?
AWS DMS BatchApplyEnabled
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Last reviewed: Jun 20, 2026
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