The correct first step is to verify the file path and pattern in the OPENROWSET query. When a serverless SQL pool returns fewer rows than expected from Parquet files in Azure Data Lake Storage Gen2, the most common technical cause is an overly restrictive file path or missing wildcard, which limits the query to only a subset of the files rather than the full dataset. On the Microsoft Azure Data Engineer Associate DP-203 exam, this scenario tests your understanding of how OPENROWSET resolves file locations—a frequent trap is assuming schema mismatch or permission issues first, when the path itself is the culprit. Remember that serverless SQL pool relies on the specified pattern to enumerate files; a path like `/sales/2024/` without a wildcard will read only that folder, while `/sales/**` captures all subfolders. A quick memory tip: “Path first, permissions last”—always confirm the file pattern before troubleshooting data types or access rights.
DP-203 Develop data processing Practice Question
This DP-203 practice question tests your understanding of develop data processing. 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.
You are using Azure Synapse Analytics serverless SQL pool to query Parquet files in Azure Data Lake Storage Gen2. The query returns fewer rows than expected. What should you check first?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "first"
Why it matters: Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Verify the file path and pattern in the OPENROWSET query.
Option D is correct because when using OPENROWSET in Azure Synapse serverless SQL pool to query Parquet files, the most common reason for fewer rows than expected is an incorrect file path or pattern. If the path or pattern is too restrictive (e.g., missing a wildcard or pointing to a subfolder instead of the root), the query will only read a subset of the files, resulting in fewer rows. This is the first thing to verify before investigating schema or permissions issues.
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.
✗
Ensure the external table has the correct schema definition.
Why it's wrong here
Serverless SQL can infer schema from Parquet files.
✗
Check that the Azure AD identity has read permissions on the storage account.
Why it's wrong here
Permission issues cause errors, not silent missing rows.
✗
Check the compression codec used in the Parquet files.
Why it's wrong here
Compression does not affect row counts.
✓
Verify the file path and pattern in the OPENROWSET query.
Why this is correct
Incorrect file path or pattern can cause missing files or partitions.
Clue confirmation
The clue word "first" in the question point toward this answer.
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 often jump to schema or permission issues first, but the most frequent cause of missing rows in serverless SQL pool queries is an overly restrictive file path or pattern in the OPENROWSET query.
Detailed technical explanation
How to think about this question
The OPENROWSET function in serverless SQL pool uses a BULK rowset provider that enumerates files based on the specified path and pattern. If the path uses a trailing slash without a wildcard (e.g., 'https://storage.dfs.core.windows.net/container/folder/'), it only reads files directly in that folder, not subfolders. To include all files recursively, you must use a wildcard pattern like '/folder/**' or '/folder/*.parquet'. This is a subtle but critical distinction that directly impacts row counts.
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.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this DP-203 question in full detail.
Develop data processing — This question tests Develop data processing — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Verify the file path and pattern in the OPENROWSET query. — Option D is correct because when using OPENROWSET in Azure Synapse serverless SQL pool to query Parquet files, the most common reason for fewer rows than expected is an incorrect file path or pattern. If the path or pattern is too restrictive (e.g., missing a wildcard or pointing to a subfolder instead of the root), the query will only read a subset of the files, resulting in fewer rows. This is the first thing to verify before investigating schema or permissions issues.
What should I do if I get this DP-203 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Are there clue words in this question I should notice?
Yes — watch for: "first". Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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