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Data Ingestion and Transformation →mediumMultiple ChoiceObjective-mapped

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 to load data from an on-premises Oracle database to Amazon S3. The pipeline should capture changes in near real-time (within minutes) and minimize impact on the source database. The source table has a 'last_modified' timestamp column. Which service combination would meet these requirements?

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.

A
AWS DMS with a replication task in CDC mode, writing to S3 in Parquet format.
DMS CDC captures minimal changes and writes to S3 with low latency.
B
Amazon Kinesis Data Firehose with a Lambda function that queries Oracle.
Why wrong: Firehose cannot directly connect to Oracle; requires custom solution.
C
AWS Data Pipeline with a periodic SQL query activity to copy full table snapshots.
Why wrong: Full snapshots are not near real-time and impact source.
D
AWS Glue with a JDBC connection to Oracle, running a crawler every 5 minutes.
Why wrong: Glue crawlers are for schema discovery, not CDC. A Glue ETL job would be batch and may impact source.

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

✓

AWS DMS with a replication task in CDC mode, writing to S3 in Parquet format.

AWS DMS with a replication task in CDC (Change Data Capture) mode is the correct choice because it continuously reads the Oracle redo logs to capture near real-time changes (within seconds to minutes) with minimal impact on the source database. It can directly write to S3 in Parquet format, meeting the requirement for low-latency ingestion without full table scans.

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.

✓
AWS DMS with a replication task in CDC mode, writing to S3 in Parquet format.
Why this is correct
DMS CDC captures minimal changes and writes to S3 with low latency.
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.
✗
Amazon Kinesis Data Firehose with a Lambda function that queries Oracle.
Why it's wrong here
Firehose cannot directly connect to Oracle; requires custom solution.
✗
AWS Data Pipeline with a periodic SQL query activity to copy full table snapshots.
Why it's wrong here
Full snapshots are not near real-time and impact source.
✗
AWS Glue with a JDBC connection to Oracle, running a crawler every 5 minutes.
Why it's wrong here
Glue crawlers are for schema discovery, not CDC. A Glue ETL job would be batch and may impact source.

Common exam traps

Common exam trap: answer the scenario, not the keyword

The trap here is that candidates assume a 'last_modified' timestamp column enables easy CDC via polling (options B, D), but the question tests that true near real-time CDC with minimal source impact requires reading database redo logs, not querying the table, and that services like Kinesis or Glue cannot perform log-based CDC without additional custom logic.

Detailed technical explanation

How to think about this question

AWS DMS CDC mode works by connecting to Oracle as a LogMiner or using binary reader to read redo logs, capturing INSERT, UPDATE, and DELETE operations with minimal overhead. The 'last_modified' timestamp column is not used by DMS CDC; instead, DMS relies on database-level change streams, making it suitable for tables without a reliable timestamp or for capturing deletes. In real-world scenarios, DMS can handle high-volume transactional databases (e.g., 10k+ changes/sec) by batching changes and writing to S3 in columnar formats like Parquet for efficient downstream analytics.

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.

Quick reference

AWS S3 Storage Class Comparison

Storage Class	Min Duration	Retrieval	Use Case
S3 Standard	None	Immediate	Frequently accessed data
S3 Standard-IA	30 days	Immediate	Infrequent access, rapid retrieval
S3 One Zone-IA	30 days	Immediate	Non-critical infrequent data
S3 Intelligent-Tiering	None	Immediate–hours	Unknown or changing access patterns
S3 Glacier Instant	90 days	Milliseconds	Archive with instant retrieval
S3 Glacier Flexible	90 days	Minutes–hours	Archive, flexible retrieval
S3 Glacier Deep Archive	180 days	Hours	Long-term compliance archive

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.

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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 — Read the scenario before looking for a memorised answer..

What is the correct answer to this question?

The correct answer is: AWS DMS with a replication task in CDC mode, writing to S3 in Parquet format. — AWS DMS with a replication task in CDC (Change Data Capture) mode is the correct choice because it continuously reads the Oracle redo logs to capture near real-time changes (within seconds to minutes) with minimal impact on the source database. It can directly write to S3 in Parquet format, meeting the requirement for low-latency ingestion without full table scans.

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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This DEA-C01 practice question is part of Courseiva's free Amazon Web Services certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the DEA-C01 exam.