Question 4 of 881
AZ-204 Develop Azure compute solutions Practice Question
You are developing an Azure Logic App that processes files from an FTP server. The workflow must run every 10 minutes and process only new files. You need to ensure that files are not processed more than once. What should you use?
⚠ Common exam trap
The trap here is that candidates often incorrectly assume that the 'When a file is added or modified' trigger is required for deduplication, but the plain 'When a file is added' trigger already has built-in state tracking. Using 'or modified' would also process modified files, which is not desired.
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
✓
Use the FTP trigger 'When a file is added' with a recurrence of 10 minutes.
The 'When a file is added' FTP trigger in Azure Logic Apps automatically tracks processed files using a built-in 'trigger state' mechanism. When combined with a recurrence schedule (e.g., every 10 minutes), it ensures that only new files since the last run are processed, preventing duplicate processing without external state management.
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 the FTP trigger 'When a file is added' with a recurrence of 10 minutes.
Why this is correct
Correct. The 'When a file is added' trigger with a recurrence of 10 minutes uses built-in state management to process only new files, preventing reprocessing.
- ✗
Use the 'When a file is added' trigger and store processed file names in a SQL database.
Why it's wrong here
This works but introduces unnecessary complexity and overhead.
- ✗
Use the FTP trigger 'When a file is added or modified' with a recurrence of 10 minutes.
Why it's wrong here
Incorrect. The 'When a file is added or modified' trigger would also process modified files, not just new ones, contradicting the requirement.
- ✗
Use the Sliding Window trigger and set the window size to 10 minutes.
Why it's wrong here
Sliding Window is for time windows, not file-level tracking.
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Last reviewed: Jun 24, 2026
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