DP-203 Design and implement data storage Practice Question
Exhibit
Refer to the exhibit. az storage blob show \ --account-name exampledatalake \ --container-name raw \ --name sensor/2023/01/01/data.parquet \ --query "properties.blobTier" Output: "Cool"
A data engineer runs the Azure CLI command shown in the exhibit. The blob is stored in Azure Blob Storage. The team previously set a lifecycle management rule to move blobs to the Archive tier after 30 days. The blob was created 45 days ago. What is the most likely reason the blob is still in the Cool tier?
⚠ Common exam trap
Candidates often assume lifecycle rules are evaluated immediately or that blobs must be in Hot tier to be moved to Archive, but Azure's daily evaluation cycle and the ability to move from Cool to Archive are the key nuances tested.
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 lifecycle management rule was configured after the blob was created, and it can take up to 24 hours for the rule to be evaluated.
The lifecycle management rule is evaluated by Azure Storage once per day. If the rule was configured after the blob was created, it may not have been evaluated yet, and it can take up to 24 hours for the rule to apply. Since the blob is 45 days old and still in Cool tier, the most likely reason is that the rule has not yet been evaluated after its configuration.
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 lifecycle management rule only applies to blobs in the Hot tier.
Why it's wrong here
Incorrect. Lifecycle rules apply to both Hot and Cool tiers.
- ✓
The lifecycle management rule was configured after the blob was created, and it can take up to 24 hours for the rule to be evaluated.
Why this is correct
Correct. Lifecycle rules are evaluated once per day, so there may be a delay.
- ✗
The blob is in a container that is excluded from the lifecycle rule.
Why it's wrong here
Possible, but not the most likely reason given the info.
- ✗
The blob must be in the Hot tier for the rule to move it to Archive.
Why it's wrong here
Incorrect. The rule can move from Cool to Archive.
Quick reference
Azure Blob Storage Tier Comparison
| Tier | Storage Cost | Retrieval Cost | Latency | Use Case |
|---|---|---|---|---|
| Hot | Highest | Lowest | Immediate | Active data, frequent reads |
| Cool | Lower | Higher | Immediate | Data accessed < once / month |
| Cold | Lower still | Higher | Immediate | Data accessed < once / quarter |
| Archive | Lowest | Highest + rehydration delay | Hours | Long-term compliance retention |
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