Question 1,123 of 1,672
MLS-C01 Amazon Athena Practice Question
Network Topology
A data scientist runs the above AWS CLI command and gets the output. The object size is 1 GB. They try to open the CSV file in Amazon Athena but get an error. What is the most likely cause?
⚠ Common exam trap
Athena's 100 MB per-file limit for CSV queries without partitioning is often overlooked; candidates may assume the file is too large overall, but partitioning allows much larger datasets.
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
✓
The file exceeds the maximum CSV file size that Athena can query without partitioning
Amazon Athena has a default limit of 100 MB per CSV file when querying without partitioning. A 1 GB file exceeds this limit, causing an error. Option A is wrong because CSV is a supported file format in Athena. Option C is wrong while gzip compression is supported, it is not required; the issue is file size, not compression. Option D is wrong because Athena can query large files, but only if they are properly partitioned or if the file size is within the per-file limit.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
The file format is not supported by Athena
Why it's wrong here
Athena supports CSV.
- ✓
The file exceeds the maximum CSV file size that Athena can query without partitioning
Why this is correct
Athena has a 100 MB limit for CSV files when not partitioned.
- ✗
The file is not compressed with gzip
Why it's wrong here
Athena supports gzip compression.
- ✗
The file is too large for Athena to query at all
Why it's wrong here
Athena can query larger files if partitioned or using other formats.
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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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