- A
Use staged copy with an intermediate storage.
Why wrong: Staged copy improves performance but does not handle schema drift.
- B
Enable schema drift in a Mapping Data Flow activity.
Mapping Data Flow can automatically handle schema drift by mapping new columns.
- C
Define a fixed schema in the source dataset.
Why wrong: Fixed schema would cause errors when new columns appear in the source.
- D
Use PolyBase to load data into the dedicated SQL pool.
Why wrong: PolyBase expects a fixed schema and will fail if the source schema changes.
- E
Use the Copy activity with AutoCreateTable enabled.
AutoCreateTable automatically creates the sink table based on the source schema, adapting to changes.
Question 119 of 851
DP-203 Develop data processing Practice Question
This DP-203 practice question tests your understanding of develop data processing. 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.
You are building a data processing pipeline in Azure Synapse Analytics that ingests data from Azure Blob Storage and writes to a dedicated SQL pool. You need to ensure the pipeline can handle schema changes in the source data without failing. Which TWO actions should you take?
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
✓
Enable schema drift in a Mapping Data Flow activity.
Mapping Data Flows in Azure Synapse Analytics support schema drift, which allows the pipeline to dynamically handle changes in source data structure (e.g., new columns, changed data types) without failing. By enabling schema drift, the data flow can automatically detect and propagate these changes downstream, ensuring resilience against schema evolution.
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 staged copy with an intermediate storage.
Why it's wrong here
Staged copy improves performance but does not handle schema drift.
- ✓
Enable schema drift in a Mapping Data Flow activity.
Why this is correct
Mapping Data Flow can automatically handle schema drift by mapping new columns.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Define a fixed schema in the source dataset.
Why it's wrong here
Fixed schema would cause errors when new columns appear in the source.
- ✗
Use PolyBase to load data into the dedicated SQL pool.
Why it's wrong here
PolyBase expects a fixed schema and will fail if the source schema changes.
- ✓
Use the Copy activity with AutoCreateTable enabled.
Why this is correct
AutoCreateTable automatically creates the sink table based on the source schema, adapting to changes.
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 confuse PolyBase or staged copy with schema drift handling, but those features are designed for performance or staging, not for dynamic schema adaptation.
Detailed technical explanation
How to think about this question
Schema drift in Mapping Data Flows works by using the 'Allow schema drift' option in the source and sink transformations, which enables the engine to read and write columns that are not defined in the dataset schema. Under the hood, it uses a dynamic schema model that maps columns by name rather than ordinal position, allowing new columns to be added or removed without breaking the pipeline. In real-world scenarios, this is critical when ingesting data from sources like IoT devices or logs where the schema evolves frequently.
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
Azure Blob Storage Tier Comparison
| Tier | Storage Cost | Retrieval Cost | Latency | Use Case |
|---|---|---|---|---|
| Hot | Highest | Lowest | Immediate | Active data, frequent reads |
| Cool | Lower | Higher | Immediate | Data accessed < once / month |
| Cold | Lower still | Higher | Immediate | Data accessed < once / quarter |
| Archive | Lowest | Highest + rehydration delay | Hours | Long-term compliance retention |
What to study next
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FAQ
Questions learners often ask
What does this DP-203 question test?
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: Enable schema drift in a Mapping Data Flow activity. — Mapping Data Flows in Azure Synapse Analytics support schema drift, which allows the pipeline to dynamically handle changes in source data structure (e.g., new columns, changed data types) without failing. By enabling schema drift, the data flow can automatically detect and propagate these changes downstream, ensuring resilience against schema evolution.
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.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 24, 2026
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