DEA-C01 Data Ingestion and Transformation Practice Question
A data engineer needs to run a one-time AWS Glue ETL job that reads data from an Amazon S3 bucket and writes transformed Parquet files to another S3 bucket. The job does not need a schedule and should be run immediately after creation. Which method should the engineer use to start the job?
⚠ Common exam trap
The trap here is assuming that a trigger or workflow is always required to start an AWS Glue job, when a direct start is sufficient for on-demand runs.
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 AWS Glue console or AWS CLI to start the job run directly.
For a one-time, unscheduled AWS Glue job, the simplest way to start it is to invoke StartJobRun through the console, AWS CLI, or SDK. Triggers and workflows are used for scheduling or orchestration and are not needed when the job should run immediately after creation.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Configure a scheduled trigger with a cron expression that runs once.
Why it's wrong here
A scheduled trigger with a one-time cron expression would still create a trigger resource and wait for the scheduled time. This is unnecessary overhead for an immediate run and is intended for recurring schedules, not for starting a job right away.
- ✗
Create a trigger with type ON_DEMAND and activate it.
Why it's wrong here
An ON_DEMAND trigger can start a job, but it requires an additional trigger resource and is more suited for event-driven or API-invoked starts. For a simple immediate one-time run, directly starting the job is simpler and does not require creating a trigger. This adds unnecessary complexity for the scenario.
- ✗
Create a workflow and add the job to it, then start the workflow.
Why it's wrong here
AWS Glue workflows are used to orchestrate multiple crawlers and jobs with dependencies. Creating a workflow for a single job adds unnecessary complexity and is not required to start a job immediately. The job can be started directly without a workflow.
- ✓
Use the AWS Glue console or AWS CLI to start the job run directly.
Why this is correct
AWS Glue jobs can be started immediately by using the StartJobRun API, the AWS CLI command start-job-run, or the console's Run job button. This is the most straightforward method for a one-time, unscheduled job run and does not require any trigger configuration.
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 |
Go deeper
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Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed September 2026 · checked against the official Amazon Web Services exam blueprint
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