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Question 791 of 1,755

Data Engineering →hardMultiple ChoiceObjective-mapped

MLS-C01 Data Engineering Practice Question

This MLS-C01 practice question tests your understanding of data engineering. 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 pipeline that ingests 500 GB of data daily from an on-premises Oracle database to Amazon S3. The pipeline must minimize data loss and support change data capture (CDC). Which combination of services should they use?

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 Database Migration Service (DMS) with ongoing replication
DMS supports CDC and can write to S3.
B
AWS Data Pipeline with SQL query
Why wrong: Data Pipeline is batch and does not support CDC.
C
Amazon Kinesis Data Streams with a custom Oracle CDC connector
Why wrong: Kinesis requires custom development and is not managed.
D
AWS Glue ETL jobs running on a schedule
Why wrong: Glue jobs are batch and do not support CDC.

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 Database Migration Service (DMS) with ongoing replication

AWS DMS with ongoing replication is the correct choice because it provides continuous change data capture (CDC) from an Oracle source database using Oracle LogMiner or binary reader technology, replicating transactions in near real-time to Amazon S3. This minimizes data loss by capturing incremental changes without requiring batch snapshots, and it supports the 500 GB daily volume efficiently with parallel tasks and task tuning.

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 Database Migration Service (DMS) with ongoing replication
Why this is correct
DMS supports CDC and can write to S3.
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.
✗
AWS Data Pipeline with SQL query
Why it's wrong here
Data Pipeline is batch and does not support CDC.
✗
Amazon Kinesis Data Streams with a custom Oracle CDC connector
Why it's wrong here
Kinesis requires custom development and is not managed.
✗
AWS Glue ETL jobs running on a schedule
Why it's wrong here
Glue jobs are batch and do not support CDC.

Common exam traps

Common exam trap: answer the scenario, not the keyword

The trap here is that candidates may confuse Amazon Kinesis Data Streams with a custom CDC connector as a viable alternative, but AWS does not provide a managed Oracle CDC connector for Kinesis, making DMS the only fully managed, production-ready service for this use case.

Detailed technical explanation

How to think about this question

AWS DMS for Oracle CDC leverages Oracle's redo logs via LogMiner or the binary reader API to capture committed transactions as they occur, storing them in a staging table before applying to the target S3 bucket in Parquet or CSV format. Under the hood, DMS uses a replication instance with task-level settings like 'MaxFullLoadSubTasks' and 'ParallelApplyThreads' to handle high-volume ingestion, and it supports 'TaskRecovery' to resume from the last checkpoint in case of failure, ensuring minimal data loss. A real-world scenario where this matters is migrating a financial database with continuous transactions, where even seconds of data loss are unacceptable.

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 MLS-C01 question test?

Data Engineering — This question tests Data Engineering — Read the scenario before looking for a memorised answer..

What is the correct answer to this question?

The correct answer is: AWS Database Migration Service (DMS) with ongoing replication — AWS DMS with ongoing replication is the correct choice because it provides continuous change data capture (CDC) from an Oracle source database using Oracle LogMiner or binary reader technology, replicating transactions in near real-time to Amazon S3. This minimizes data loss by capturing incremental changes without requiring batch snapshots, and it supports the 500 GB daily volume efficiently with parallel tasks and task tuning.

What should I do if I get this MLS-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 MLS-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 MLS-C01 exam.