Quick Answer
The correct choice is AWS Database Migration Service (DMS) with ongoing replication because it natively supports change data capture from Oracle to S3, continuously reading the Oracle redo logs to capture inserts, updates, and deletes with minimal latency and near-zero data loss. This makes it ideal for ingesting 500 GB daily while maintaining a real-time, incremental data flow into S3. On the AWS Certified Machine Learning Specialty MLS-C01 exam, this scenario tests your understanding of CDC versus batch processing—a common trap is selecting AWS Glue, which lacks native CDC support and is better suited for ETL transformations, or Amazon Kinesis, which requires custom agents for Oracle. Remember the memory tip: "DMS does CDC, Glue does ETL"—if the question demands ongoing replication from a database, DMS is the only managed service that handles it out of the box.
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.
AWS Database Migration Service (DMS) with ongoing replication
DMS supports CDC and can write to S3.
AWS Data Pipeline with SQL query
Why wrong: Data Pipeline is batch and does not support CDC.
Amazon Kinesis Data Streams with a custom Oracle CDC connector
Why wrong: Kinesis requires custom development and is not managed.
AWS Glue ETL jobs running on a schedule
Why wrong: Glue jobs are batch and do not support CDC.
Answer choices
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 Database Migration Service (DMS) with ongoing replication enables CDC from Oracle to S3. Option A is wrong because Glue does not support CDC directly. Option B is wrong because Kinesis requires custom agents. Option D is wrong because Data Pipeline is batch.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Answer analysis
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
Static NAT maps one inside address to one outside address.
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
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Detailed technical explanation
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Real-world example
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
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related MLS-C01 NAT questions on configuration and troubleshooting.
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FAQ
Data Engineering — This question tests Data Engineering — Static NAT maps one inside address to one outside address..
The correct answer is: AWS Database Migration Service (DMS) with ongoing replication — AWS Database Migration Service (DMS) with ongoing replication enables CDC from Oracle to S3. Option A is wrong because Glue does not support CDC directly. Option B is wrong because Kinesis requires custom agents. Option D is wrong because Data Pipeline is batch.
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related MLS-C01 NAT questions on configuration and troubleshooting.
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.
Static NAT maps one inside address to one outside address.
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Same concept, more angles
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. A data engineer needs to set up a data pipeline that ingests data from an Amazon RDS MySQL database into Amazon S3. The pipeline should run daily and capture incremental changes (inserts, updates, deletes) from the source database. Which AWS service should be used as the data ingestion tool?
easyWhy A: AWS Database Migration Service (DMS) supports continuous replication and can capture changes using CDC. Option A (DMS with CDC) is correct. Option B (Glue) can do batch but not native CDC. Option C (Data Pipeline) is older and less suited for CDC. Option D (Kinesis) is for streaming, not database replication.
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Last reviewed: Jun 20, 2026
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.
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