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Data Ingestion and Transformation →hardMultiple ChoiceObjective-mapped

DMS Continuous Replication Without Native CDC

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 company is ingesting data from multiple on-premises databases into AWS using AWS Database Migration Service (DMS). The data must be continuously replicated with minimal downtime. However, the source databases do not support native CDC. What should the data engineer do to enable continuous replication?

A
Use Amazon Kinesis Data Streams with a custom producer to capture database changes.
Why wrong: Kinesis requires a producer to push data, not pull from databases.
B
Use Amazon Redshift Spectrum to directly query the on-premises databases.
Why wrong: Redshift Spectrum queries data in S3, not on-premises databases.
C
Use AWS DMS with log-based CDC if the source databases support it; otherwise, use DMS with batch replication and schedule frequent refreshes.
DMS supports CDC via source database logs, and if not available, batch replication can approximate continuous sync.
D
Set up AWS Glue jobs to run every minute to extract and load the data.
Why wrong: Glue is batch-oriented and not designed for real-time 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

✓

Use AWS DMS with log-based CDC if the source databases support it; otherwise, use DMS with batch replication and schedule frequent refreshes.

Option C is correct because when source databases do not support native CDC, AWS DMS can still achieve continuous replication by using log-based CDC if the database engine supports it (e.g., Oracle, SQL Server, MySQL, PostgreSQL). If log-based CDC is not supported, DMS batch replication with frequent scheduled refreshes provides near-continuous replication by periodically extracting full or incremental changes, minimizing downtime. This approach leverages DMS's built-in task settings for change data capture and resumption without requiring external streaming services.

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 Amazon Kinesis Data Streams with a custom producer to capture database changes.
Why it's wrong here
Kinesis requires a producer to push data, not pull from databases.
✗
Use Amazon Redshift Spectrum to directly query the on-premises databases.
Why it's wrong here
Redshift Spectrum queries data in S3, not on-premises databases.
✓
Use AWS DMS with log-based CDC if the source databases support it; otherwise, use DMS with batch replication and schedule frequent refreshes.
Why this is correct
DMS supports CDC via source database logs, and if not available, batch replication can approximate continuous sync.
Related concept
Read the scenario before looking for a memorised answer.
✗
Set up AWS Glue jobs to run every minute to extract and load the data.
Why it's wrong here
Glue is batch-oriented and not designed for real-time CDC.

Common exam traps

Common exam trap: answer the scenario, not the keyword

The trap here is that candidates assume AWS DMS always requires native CDC or that Kinesis is the only way to achieve streaming replication, but DMS provides fallback mechanisms like batch replication with frequent refreshes to handle sources without native CDC support.

Detailed technical explanation

How to think about this question

AWS DMS supports log-based CDC by reading the source database's transaction logs (e.g., Oracle redo logs, MySQL binlogs) to capture changes in near real-time, but this requires the source to have those logs enabled and accessible. When log-based CDC is unavailable, DMS batch replication uses a 'full load + ongoing replication' mode where it periodically performs incremental loads based on timestamp or sequence columns, which can be scheduled as frequently as every few seconds to minimize latency. In practice, for databases like older versions of MySQL or PostgreSQL without logical replication slots, DMS's batch approach with a 1-minute refresh interval is often the only viable option for near-continuous replication.

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 cloud solutions architect for a retail company is evaluating services for a new workload. The correct answer here reflects best practice for the specific scenario described — not a general cloud recommendation. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.

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: Use AWS DMS with log-based CDC if the source databases support it; otherwise, use DMS with batch replication and schedule frequent refreshes. — Option C is correct because when source databases do not support native CDC, AWS DMS can still achieve continuous replication by using log-based CDC if the database engine supports it (e.g., Oracle, SQL Server, MySQL, PostgreSQL). If log-based CDC is not supported, DMS batch replication with frequent scheduled refreshes provides near-continuous replication by periodically extracting full or incremental changes, minimizing downtime. This approach leverages DMS's built-in task settings for change data capture and resumption without requiring external streaming services.

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.

What is the key concept behind this question?

Read the scenario before looking for a memorised answer.

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