DEA-C01 Data Store Management Practice Question
Exhibit
Refer to the exhibit.
{
"AWSTemplateFormatVersion": "2010-09-09",
"Resources": {
"MyBucket": {
"Type": "AWS::S3::Bucket",
"Properties": {
"BucketName": "my-app-data-bucket",
"LifecycleConfiguration": {
"Rules": [
{
"Id": "ArchiveRule",
"Status": "Enabled",
"Transitions": [
{
"StorageClass": "GLACIER",
"TransitionInDays": 30
}
]
}
]
}
}
}
}
}A data engineer deploys the CloudFormation template shown in the exhibit. After 60 days, what will be the storage class of objects in the bucket?
⚠ Common exam trap
Many candidates confuse the Days parameter with a countdown from the rule creation date rather than from the object's creation date, or assume that a lifecycle rule without an explicit expiration means objects are deleted by default.
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
✓
The objects will be in GLACIER storage class.
The CloudFormation template includes a lifecycle rule with a transition action to the GLACIER storage class after 60 days from object creation. Since the rule is properly configured and no expiration action is defined, objects will be moved from STANDARD to GLACIER at day 60. This is standard S3 lifecycle behavior, and objects are not deleted unless a separate expiration rule is set.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
The objects will be in GLACIER storage class.
Why this is correct
The CloudFormation template includes a lifecycle rule that transitions objects to the GLACIER storage class after 60 days. Since the rule is configured with a transition action to GLACIER, objects will be moved from their initial storage class (typically STANDARD) to GLACIER once they reach 60 days of age. This matches the correct answer.
- ✗
The objects will be deleted.
Why it's wrong here
The template does not include an expiration action; only transition.
- ✗
The objects will remain in STANDARD storage class because the rule is not triggered.
Why it's wrong here
The rule is enabled and will trigger after 30 days.
- ✗
The objects will be immediately transitioned to GLACIER upon creation.
Why it's wrong here
TransitionInDays is 30, so transition occurs after 30 days.
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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