- A
Increase the number of DPUs allocated to the Glue job.
More DPUs provide more parallelism.
- B
Use a single JDBC connection per partition.
Why wrong: Single connection per partition is default; increasing may help but not as impactful as others.
- C
Increase the JDBC fetch size parameter.
Larger fetch size reduces number of network round trips.
- D
Convert the output format from Parquet to CSV.
Why wrong: CSV is larger and slower to write than Parquet.
- E
Use a pushdown predicate to filter data at the source.
Reduces the amount of data transferred from RDS.
Question 1,218 of 1,786
DEA-C01 Data Ingestion and Transformation Practice Question
This DEA-C01 practice question tests your understanding of data ingestion and transformation. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 troubleshooting an AWS Glue job that reads from Amazon RDS MySQL and writes to Amazon S3. The job runs successfully but takes longer than expected. The engineer wants to optimize performance. Which THREE actions would improve job performance?
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
✓
Increase the number of DPUs allocated to the Glue job.
Increasing the number of DPUs (Data Processing Units) allocated to the AWS Glue job provides more parallel processing capacity, allowing the job to process data faster. This is a direct way to improve performance when the job is CPU or memory-bound, as Glue distributes the workload across the allocated DPUs.
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.
- ✓
Increase the number of DPUs allocated to the Glue job.
Why this is correct
More DPUs provide more parallelism.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Use a single JDBC connection per partition.
Why it's wrong here
Single connection per partition is default; increasing may help but not as impactful as others.
- ✓
Increase the JDBC fetch size parameter.
Why this is correct
Larger fetch size reduces number of network round trips.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Convert the output format from Parquet to CSV.
Why it's wrong here
CSV is larger and slower to write than Parquet.
- ✓
Use a pushdown predicate to filter data at the source.
Why this is correct
Reduces the amount of data transferred from RDS.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates might think converting to CSV improves performance due to simplicity, but in reality, Parquet's columnar storage and compression provide significant performance benefits for analytics workloads on S3.
Detailed technical explanation
How to think about this question
Under the hood, AWS Glue uses Apache Spark's JDBC connector to read from RDS MySQL. Increasing the JDBC fetch size parameter (option C) reduces the number of round trips to the database by fetching more rows per network call, which is especially effective for large datasets. Pushdown predicates (option E) leverage Spark's predicate pushdown optimization to filter rows at the database level, reducing the amount of data transferred over the network and processed in memory.
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.
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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: Increase the number of DPUs allocated to the Glue job. — Increasing the number of DPUs (Data Processing Units) allocated to the AWS Glue job provides more parallel processing capacity, allowing the job to process data faster. This is a direct way to improve performance when the job is CPU or memory-bound, as Glue distributes the workload across the allocated DPUs.
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.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
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Last reviewed: Jul 4, 2026
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