The answer is to enable change data capture (CDC) on the source Oracle database, configure a table mapping transformation to convert to Parquet, and set the S3 target endpoint to use the Parquet format. These three steps are correct because AWS DMS continuous replication relies on CDC to capture ongoing changes from the Oracle source, while the Parquet transformation and target endpoint setting ensure the data lands in the efficient columnar format required for analytics. On the AWS Certified Data Engineer Associate DEA-C01 exam, this scenario tests your understanding that DMS replication tasks must explicitly enable CDC for low-latency streaming, and that output format is controlled by both a transformation rule and the target endpoint configuration—a common trap is confusing AWS SCT (schema conversion) with DMS replication, or assuming a full load alone satisfies continuous replication. Remember the mnemonic: CDC, Convert, Configure—three C’s for continuous Parquet replication.
DEA-C01 Data Ingestion and Transformation 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. 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 data engineer is designing a data ingestion pipeline that uses AWS DMS to migrate data from an on-premises Oracle database to Amazon S3 in Parquet format. The engineer needs to ensure that data is continuously replicated with minimal latency. Which THREE steps should the engineer take? (Choose three.)
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Configure a DMS task with a transformation rule to convert to Parquet.
Options A, C, and E are correct. Option A enables continuous replication using CDC. Option C uses a transformation to convert to Parquet. Option E uses a target endpoint for S3 with parquet format. Option B is wrong because SCT is for schema conversion, not for DMS replication. Option D is wrong because a full load only is not continuous replication.
Key principle: ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✓
Configure a DMS task with a transformation rule to convert to Parquet.
Why this is correct
DMS can transform data to Parquet format.
Related concept
Standard ACLs match source addresses.
✓
Specify an S3 bucket as the target endpoint with data format set to Parquet.
Why this is correct
S3 target endpoint supports Parquet format.
Related concept
Standard ACLs match source addresses.
✗
Use AWS Schema Conversion Tool (SCT) to convert the schema.
Why it's wrong here
SCT is for heterogeneous migrations, not for DMS to S3.
✓
Enable change data capture (CDC) on the source database.
Why this is correct
CDC is required for continuous replication.
Related concept
Standard ACLs match source addresses.
✗
Perform a full load only, without CDC.
Why it's wrong here
Full load only does not provide continuous replication.
Common exam traps
Common exam trap: ACLs stop at the first match
ACLs are processed top to bottom. The first matching entry wins, and an implicit deny usually exists at the end.
Detailed technical explanation
How to think about this question
ACL questions test precision: source, destination, protocol, port and direction. A generally correct ACL can still fail if it is applied on the wrong interface or in the wrong direction.
KKey Concepts to Remember
Standard ACLs match source addresses.
Extended ACLs can match source, destination, protocol and ports.
The first matching ACL entry is used.
There is usually an implicit deny at the end.
TExam Day Tips
→Check inbound versus outbound direction.
→Read the ACL from top to bottom.
→Look for a broader permit or deny above the intended line.
Key takeaway
ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.
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.
Review ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related DEA-C01 ACL questions on filtering logic and placement.
Data Ingestion and Transformation — This question tests Data Ingestion and Transformation — Standard ACLs match source addresses..
What is the correct answer to this question?
The correct answer is: Configure a DMS task with a transformation rule to convert to Parquet. — Options A, C, and E are correct. Option A enables continuous replication using CDC. Option C uses a transformation to convert to Parquet. Option E uses a target endpoint for S3 with parquet format. Option B is wrong because SCT is for schema conversion, not for DMS replication. Option D is wrong because a full load only is not continuous replication.
What should I do if I get this DEA-C01 question wrong?
Review ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related DEA-C01 ACL questions on filtering logic and placement.
What is the key concept behind this question?
Standard ACLs match source addresses.
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Question Discussion
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