DEA-C02 Data Movement Practice Question
A company requires continuous ingestion of JSON logs from an S3 bucket into a Snowflake table with minimal latency. They decide to use Snowpipe with auto-ingest. How does Snowflake determine which new files need to be processed once the pipe is created?
⚠ Common exam trap
Candidates often assume Snowflake 'polls' the S3 bucket directly. They fail to understand the event-driven nature of the SQS queue, which is the actual trigger for the pipe.
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
✓
It relies on event notifications from S3 sent to a Snowflake-managed SQS queue to trigger the pipe.
Snowpipe with auto-ingest relies on cloud-native messaging services to notify Snowflake of new data. When a file is uploaded to S3, an S3 Event Notification is triggered, which sends a message to a Snowflake-managed SQS queue. Snowpipe constantly monitors this queue and triggers the ingestion process as soon as it receives a notification, ensuring near real-time data movement without manual intervention.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Snowflake performs a metadata scan of the S3 bucket every 60 seconds to identify files with new timestamps.
Why it's wrong here
Snowflake does not periodically poll or scan external cloud storage for Snowpipe because it would be inefficient and costly. Polling mechanisms would either introduce significant latency or consume unnecessary resources. Instead, Snowpipe uses an event-driven architecture to react immediately to file creation events via cloud messaging services.
- ✗
The Snowpipe object uses the LIST command internally to compare the stage contents against the load history table.
Why it's wrong here
While the COPY command uses load history to prevent duplicate ingestion, Snowpipe's auto-ingest mechanism does not rely on active LIST commands to find work. Relying on LIST operations for continuous ingestion would be slow and scale poorly as the number of files in the bucket increases over time.
- ✓
It relies on event notifications from S3 sent to a Snowflake-managed SQS queue to trigger the pipe.
Why this is correct
This is the core architecture of Snowpipe auto-ingest. By integrating with S3 Event Notifications, Snowflake receives an asynchronous signal the moment a file is written. This allows the serverless compute resources to spin up only when there is work to do, providing a highly scalable and cost-effective ingestion path.
- ✗
The data engineer must execute the ALTER PIPE... REFRESH command every time new data is uploaded to the stage.
Why it's wrong here
The REFRESH command is a manual recovery or synchronization tool, not a standard operational requirement for auto-ingest. The purpose of auto-ingest is to automate the process entirely; requiring a manual command for every upload would defeat the purpose of using Snowpipe for continuous data movement and real-time processing.
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
One of 229 original DEA-C02 practice questions on Courseiva, each with a full explanation and wrong-answer analysis — not exam dumps or protected exam content. 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 DEA-C02 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 DEA-C02 exam.