The correct approach is to use AWS DMS to perform a full load, then enable ongoing replication to capture changes. This is correct because AWS DMS can execute a full load of the 2 TB Oracle database while simultaneously using Change Data Capture (CDC) to log ongoing transactions. Once the full load completes, DMS applies the cached CDC changes to Amazon Redshift, ensuring data consistency without requiring the source database to be taken offline. On the AWS Certified Data Engineer Associate DEA-C01 exam, this scenario tests your understanding of minimizing downtime during a heterogeneous migration—a common trap is assuming you must stop the source database for a consistent snapshot, but DMS’s CDC handles that automatically. Remember the memory tip: “Full load first, CDC caches the rest” to recall that DMS captures changes during the load and applies them afterward, keeping downtime to a minimum.
DEA-C01 Data Store Management Practice Question
This DEA-C01 practice question tests your understanding of data store management. 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 its on-premises Oracle data warehouse to Amazon Redshift. The data engineering team needs to load data from Oracle to Redshift using AWS DMS (Database Migration Service). The source database is 2 TB in size. The team wants to minimize downtime and ensure data consistency during full load. Which approach should they take?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "minimum / minimize"
Why it matters: Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use AWS DMS to perform a full load, then enable ongoing replication to capture changes.
Option B is correct because AWS DMS can perform a full load of the 2 TB Oracle database while simultaneously capturing ongoing changes via CDC (Change Data Capture). After the full load completes, DMS applies the cached changes to Redshift, ensuring data consistency with minimal downtime. This approach avoids stopping the source database and leverages DMS's native replication capabilities.
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.
✗
Use UNLOAD command to export data from Oracle to S3, then COPY into Redshift.
Why it's wrong here
UNLOAD is a Redshift command, not for Oracle.
✓
Use AWS DMS to perform a full load, then enable ongoing replication to capture changes.
Why this is correct
Minimizes downtime and ensures consistency.
Clue confirmation
The clue word "minimum / minimize" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Stop the source database, export data to flat files, upload to S3, and use COPY to load into Redshift.
Why it's wrong here
Causes significant downtime.
✗
Use COPY command directly from Oracle to Redshift over JDBC.
Why it's wrong here
COPY reads from S3, not directly from Oracle.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may confuse the UNLOAD command (Redshift export) with an Oracle export tool, or assume that a full database stop is required for consistency, when DMS's CDC capability eliminates that need.
Trap categories for this question
Command / output trap
UNLOAD is a Redshift command, not for Oracle.
Detailed technical explanation
How to think about this question
AWS DMS uses Oracle's LogMiner or binary reader to capture CDC from redo logs, enabling near-real-time replication without modifying the source schema. During full load, DMS creates multiple tables in parallel using configurable task settings, and the LOB (Large Object) handling can be tuned to avoid performance bottlenecks. The cached change data is applied to Redshift after the full load completes, using a transactionally consistent snapshot point.
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.
Data Store Management — This question tests Data Store Management — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Use AWS DMS to perform a full load, then enable ongoing replication to capture changes. — Option B is correct because AWS DMS can perform a full load of the 2 TB Oracle database while simultaneously capturing ongoing changes via CDC (Change Data Capture). After the full load completes, DMS applies the cached changes to Redshift, ensuring data consistency with minimal downtime. This approach avoids stopping the source database and leverages DMS's native replication capabilities.
What should I do if I get this DEA-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: "minimum / minimize". Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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