Quick Answer
The correct action is to increase the length of the destination columns in the SQL table to accommodate the source data. This resolves the "String or binary data would be truncated" error in ADF Copy Activity because the failure occurs when source data from Azure Blob Storage exceeds the defined column size in the target Azure SQL Database table, causing the copy operation to abort. On the Microsoft Azure Data Engineer Associate DP-203 exam, this scenario tests your understanding of data type mapping and schema validation during pipeline execution, often appearing as a troubleshooting question where candidates mistakenly blame connectivity or identity insert settings. A common trap is assuming the error relates to network issues or table structure changes mid-pipeline, but the root cause is always a length mismatch between source and destination columns. Remember the mnemonic "Truncation = Tight Columns" — if your data is cut off, the fix is always to widen the target columns, not to alter the pipeline logic.
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 monitoring an Azure Data Factory pipeline that copies data from Azure Blob Storage to Azure SQL Database. The pipeline fails intermittently with the error: 'Operation on target SQL table failed: String or binary data would be truncated.' Which action should you take to resolve this issue?
Increase the length of the destination columns in the SQL table to accommodate the source data.
Direct fix for truncation error.
Set 'enable identity insert' to true.
Why wrong: Unrelated to truncation.
Use auto-create table option in the copy activity.
Why wrong: Auto-create would inherit source schema but may still truncate.
Enable staging copy to use PolyBase.
Why wrong: PolyBase does not fix truncation.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Increase the length of the destination columns in the SQL table to accommodate the source data.
Option A is correct because the error indicates that source data length exceeds destination column length. Increasing column size resolves it. Option B is incorrect because the table already exists. Option C is incorrect because the error is not about connection. Option D is incorrect because the error is not about identity insert.
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
For each option: why learners choose it and why it is or isn't the right answer here.
Increase the length of the destination columns in the SQL table to accommodate the source data.
Why this is correct
Direct fix for truncation error.
Related concept
Static NAT maps one inside address to one outside address.
Set 'enable identity insert' to true.
Why it's wrong here
Unrelated to truncation.
Use auto-create table option in the copy activity.
Why it's wrong here
Auto-create would inherit source schema but may still truncate.
Enable staging copy to use PolyBase.
Why it's wrong here
PolyBase does not fix truncation.
Common exam traps
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
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.
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
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
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 DP-203 NAT questions on configuration and troubleshooting.
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FAQ
Develop data processing — This question tests Develop data processing — Static NAT maps one inside address to one outside address..
The correct answer is: Increase the length of the destination columns in the SQL table to accommodate the source data. — Option A is correct because the error indicates that source data length exceeds destination column length. Increasing column size resolves it. Option B is incorrect because the table already exists. Option C is incorrect because the error is not about connection. Option D is incorrect because the error is not about identity insert.
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 DP-203 NAT questions on configuration and troubleshooting.
Static NAT maps one inside address to one outside address.
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Last reviewed: Jun 21, 2026
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