The correct configuration is a lifecycle rule that uses the `SetStorageClass` action to transition objects to Nearline storage after 7 days and the `Delete` action to remove them after 30 days. This works because Cloud Storage lifecycle rules execute actions in chronological order based on the object’s age, so the archive step must occur before the deletion step to avoid losing data prematurely. On the Google Professional Data Engineer exam, this scenario tests your understanding of how to combine storage class transitions with deletion policies to optimize cost and compliance, often appearing as a scenario where candidates mistakenly reverse the order or use the wrong storage class. A common trap is assuming that archiving and deletion can happen simultaneously, but the rule must explicitly sequence the `SetStorageClass` action first. Remember the memory tip: “Archive before you delete, or your data’s obsolete.”
PDE Designing data processing systems Practice Question
This PDE practice question tests your understanding of designing data processing systems. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A data engineer needs to automatically delete objects from a Cloud Storage bucket after 30 days and archive them to nearline storage after 7 days. Which configuration should they use?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Set a lifecycle rule to SetStorageClass to nearline after 7 days and delete after 30 days
Option C is correct because it implements a lifecycle rule that first transitions objects to Nearline storage after 7 days (reducing costs for infrequently accessed data) and then deletes them after 30 days. This matches the requirement to archive after 7 days and delete after 30 days, using the `SetStorageClass` and `Delete` actions in the correct chronological order.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
Set a lifecycle rule to SetStorageClass to nearline after 30 days only
Why it's wrong here
Does not delete.
✗
Set a lifecycle rule to delete objects after 7 days only
Why it's wrong here
Does not archive.
✓
Set a lifecycle rule to SetStorageClass to nearline after 7 days and delete after 30 days
Why this is correct
Correct: archive after 7 days, delete after 30.
Related concept
Read the scenario before looking for a memorised answer.
✗
Set a lifecycle rule to delete objects after 7 days and SetStorageClass to nearline after 30 days
Why it's wrong here
Incorrect order; delete would happen before archiving.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Google Cloud often tests the order of lifecycle actions: candidates mistakenly think deletion should come before archiving, but the correct sequence is to archive first (to reduce cost) and delete later, as objects cannot be archived after deletion.
Detailed technical explanation
How to think about this question
Google Cloud Storage lifecycle management evaluates rules in order, but actions are applied independently based on the object's age. The `SetStorageClass` action transitions objects to a lower-cost storage class (e.g., Nearline, Coldline, Archive) without affecting metadata, while the `Delete` action permanently removes the object. In real-world scenarios, you might combine multiple conditions (e.g., prefix, version) to apply different rules to different subsets of objects, but the order of actions within a single rule must reflect the desired timeline.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A startup's cloud architect reviews their monthly bill and notices costs are higher than expected for a long-running batch job. Switching from on-demand instances to Reserved Instances — or using Spot/Preemptible VMs — can reduce compute costs by up to 72 %. Questions like this test whether you understand the tradeoffs between commitment, flexibility, and cost across cloud pricing models.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Designing data processing systems — This question tests Designing data processing systems — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Set a lifecycle rule to SetStorageClass to nearline after 7 days and delete after 30 days — Option C is correct because it implements a lifecycle rule that first transitions objects to Nearline storage after 7 days (reducing costs for infrequently accessed data) and then deletes them after 30 days. This matches the requirement to archive after 7 days and delete after 30 days, using the `SetStorageClass` and `Delete` actions in the correct chronological order.
What should I do if I get this PDE question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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