Quick Answer
The answer is that the SqlOperationFailed error under heavy load is most likely caused by resource contention or query timeout on the source SQL Server. When the on-premises database is overwhelmed during business hours, it struggles to allocate sufficient CPU, memory, or I/O to complete the data extraction requested by the copy activity, leading to the intermittent failure. This scenario tests your understanding of how source-side errors in Azure Data Factory relate to underlying database performance, a common topic on the DP-203 exam where you must distinguish between integration runtime issues and genuine database bottlenecks. A frequent trap is assuming the self-hosted integration runtime is at fault, but the error code explicitly points to the SQL Server side. Remember the memory tip: “Source side, server’s pride—if it’s SqlOperationFailed, the database is fried.”
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 have an Azure Data Factory pipeline that copies data from an on-premises SQL Server to Azure Blob Storage. The pipeline uses a self-hosted integration runtime. You notice that the copy activity fails intermittently with the error: 'Failure happened on 'Source' side. ErrorCode=SqlOperationFailed'. The on-premises SQL Server is under heavy load during business hours. What is the most likely cause?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
The SQL Server is experiencing resource contention or timeout due to heavy load.
Intermittent failures often due to resource pressure.
The Azure Blob Storage account is throttling requests.
Why wrong: Error is on source side.
The authentication method to SQL Server is incorrect.
Why wrong: Would cause persistent failure.
The self-hosted integration runtime is not connected to the network.
Why wrong: Would fail consistently.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
The SQL Server is experiencing resource contention or timeout due to heavy load.
The error 'SqlOperationFailed' on the source side indicates that the SQL Server itself is failing to complete the query or data extraction operation. Under heavy load, the SQL Server may experience resource contention (CPU, memory, I/O) or reach query timeout thresholds, causing the copy activity to fail intermittently. This is consistent with the described scenario of heavy load during business hours.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
The SQL Server is experiencing resource contention or timeout due to heavy load.
Why this is correct
Intermittent failures often due to resource pressure.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
The Azure Blob Storage account is throttling requests.
Why it's wrong here
Error is on source side.
The authentication method to SQL Server is incorrect.
Why it's wrong here
Would cause persistent failure.
The self-hosted integration runtime is not connected to the network.
Why it's wrong here
Would fail consistently.
Common exam traps
The trap here is that candidates may confuse a source-side error with a sink-side error, or assume that any intermittent failure must be a network or connectivity issue, rather than recognizing that SQL Server resource contention under heavy load is a classic cause of intermittent 'SqlOperationFailed' errors.
Detailed technical explanation
Under the hood, the self-hosted integration runtime uses ADO.NET to connect to SQL Server and execute a SELECT query (or a stored procedure) to extract data. When SQL Server is under heavy load, it may block or delay query execution, leading to command timeout exceptions (default 30 seconds) or deadlock victims. The copy activity retries by default (up to 3 times), but if the load persists, the intermittent failures continue. In production, you can mitigate this by setting a longer 'queryTimeout' in the copy activity source settings or by scheduling the pipeline during off-peak hours.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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
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FAQ
Develop data processing — This question tests Develop data processing — Read the scenario before looking for a memorised answer..
The correct answer is: The SQL Server is experiencing resource contention or timeout due to heavy load. — The error 'SqlOperationFailed' on the source side indicates that the SQL Server itself is failing to complete the query or data extraction operation. Under heavy load, the SQL Server may experience resource contention (CPU, memory, I/O) or reach query timeout thresholds, causing the copy activity to fail intermittently. This is consistent with the described scenario of heavy load during business hours.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 24, 2026
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