COF-C03 Data Loading, Unloading, and Connectivity Practice Question
A company is using an external S3 stage to load data daily. They want Snowflake to automatically delete the source files from the S3 bucket only after they have been successfully loaded into the table. Which COPY INTO option should they enable?
⚠ Common exam trap
Candidates often think that Snowflake automatically deletes files upon ingestion by default, or they suggest using external lifecycle policies, which are independent of the COPY INTO command.
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
✓
PURGE = TRUE
The PURGE parameter in the COPY INTO command is designed for automated cleanup of staged files. When set to TRUE, Snowflake will issue a delete command to the stage (internal or external) for every file that was successfully ingested. This helps manage storage costs and ensures that the same files are not accidentally processed again in future load cycles.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
DELETE_AFTER_LOAD = TRUE
Why it's wrong here
DELETE_AFTER_LOAD is not a valid parameter in Snowflake SQL syntax. Users often assume this is the keyword based on common naming conventions in other tools, but using it will result in a compilation error. The correct parameter for this specific functionality in the COPY INTO command is PURGE.
- ✗
REMOVE_FILES = TRUE
Why it's wrong here
Although 'REMOVE' is a separate SQL command used to manually delete files from a stage, it is not a parameter within the COPY INTO statement. To automate the removal of files as part of the ingestion transaction, the PURGE option must be used instead of trying to combine separate commands.
- ✓
PURGE = TRUE
Why this is correct
Setting PURGE = TRUE is the standard method for cleaning up files after a successful load. It is particularly useful for internal stages to keep them from hitting storage limits. For external stages like S3, it requires that the Snowflake IAM role has the appropriate permissions to delete objects from the specified bucket.
- ✗
AUTO_CLEAN = TRUE
Why it's wrong here
AUTO_CLEAN is not a recognized Snowflake parameter. While it sounds like a plausible feature for automated maintenance, Snowflake uses the term 'PURGE' to describe the action of removing source data after ingestion. Developers should always refer to the official documentation for the correct parameter names to avoid script failures.
Quick reference
AWS S3 Storage Class Comparison
| Storage Class | Min Duration | Retrieval | Use Case |
|---|---|---|---|
| S3 Standard | None | Immediate | Frequently accessed data |
| S3 Standard-IA | 30 days | Immediate | Infrequent access, rapid retrieval |
| S3 One Zone-IA | 30 days | Immediate | Non-critical infrequent data |
| S3 Intelligent-Tiering | None | Immediate–hours | Unknown or changing access patterns |
| S3 Glacier Instant | 90 days | Milliseconds | Archive with instant retrieval |
| S3 Glacier Flexible | 90 days | Minutes–hours | Archive, flexible retrieval |
| S3 Glacier Deep Archive | 180 days | Hours | Long-term compliance archive |
About these practice questions
This COF-C03 question is part of Courseiva's 280-question bank — original exam-style content with full explanations and wrong-answer analysis, never real exam questions or exam dumps. Learn why practice questions differ from exam dumps →
JA
Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed September 2026 · checked against the official Snowflake exam blueprint
This COF-C03 practice question is part of Courseiva's free Snowflake certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the COF-C03 exam.