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 clickstream data from an Amazon S3 bucket into an Amazon Redshift cluster. The data arrives in 5-minute batches. Which TWO actions should the engineer take to ensure data consistency and avoid duplicates? (Select TWO.)
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use the STL_LOAD_ERRORS system table to monitor and resolve load errors.
Options B and D are correct. Using the STL_LOAD_ERRORS table helps identify errors, and using a staging table with a MERGE/upsert pattern ensures idempotent loads. Option A (disabling WLM) is unrelated. Option C (loading into a single slice) reduces performance. Option E (using SORTKEY) improves query performance but not consistency.
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
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
Define a SORTKEY on the target table to improve deduplication.
Why it's wrong here
SORTKEY improves query performance but does not prevent duplicates.
✗
Disable workload management (WLM) to maximize resources.
Why it's wrong here
Disabling WLM is not needed for consistency and may affect other queries.
✓
Use the STL_LOAD_ERRORS system table to monitor and resolve load errors.
Why this is correct
Monitoring load errors helps catch and fix issues that could cause duplicates or missing data.
Related concept
Static NAT maps one inside address to one outside address.
✗
Load data into a single slice to maintain order.
Why it's wrong here
Loading into a single slice reduces parallelism and performance.
✓
Use a staging table and perform a MERGE operation to avoid duplicates.
Why this is correct
A staging table with MERGE (upsert) ensures that only new records are inserted, avoiding duplicates.
Related concept
Static NAT maps one inside address to one outside address.
Common exam traps
Common exam trap: NAT rules depend on direction and matching traffic
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
How to think about this question
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.
KKey Concepts to Remember
Static NAT maps one inside address to one outside address.
PAT allows many inside hosts to share one public address using ports.
Inside local and inside global describe the private and translated addresses.
NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
→Identify inside and outside interfaces first.
→Check whether the scenario needs static NAT, dynamic NAT or PAT.
→Do not confuse NAT matching ACLs with normal packet-filtering intent.
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
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 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 DEA-C01 NAT questions on configuration and troubleshooting.
Data Ingestion and Transformation — This question tests Data Ingestion and Transformation — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: Use the STL_LOAD_ERRORS system table to monitor and resolve load errors. — Options B and D are correct. Using the STL_LOAD_ERRORS table helps identify errors, and using a staging table with a MERGE/upsert pattern ensures idempotent loads. Option A (disabling WLM) is unrelated. Option C (loading into a single slice) reduces performance. Option E (using SORTKEY) improves query performance but not consistency.
What should I do if I get this DEA-C01 question wrong?
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 DEA-C01 NAT questions on configuration and troubleshooting.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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Question Discussion
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