The correct answer is to configure a lifecycle rule on the 'raw-data' bucket to delete objects older than 30 days. This works because Cloud Storage lifecycle management evaluates each object’s age from its creation time and applies the specified action—in this case, deletion—without any manual intervention, directly reducing storage costs for stale data. On the Google Professional Data Engineer exam, this scenario tests your understanding of object lifecycle policies versus bucket-level retention or versioning; a common trap is confusing deletion rules with archival actions like moving to Nearline or Coldline, which would not remove the data. Remember that lifecycle rules are defined per bucket and can target specific conditions like age, prefix, or storage class. A useful memory tip is “delete by days, not by status”—the rule triggers on elapsed time, not on whether the file has been processed, so ensure the raw-data bucket is isolated from processed files to avoid accidental deletion.
PDE Practice Question: Building and operationalizing data processing systems
This PDE practice question tests your understanding of building and operationalizing data processing systems. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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 company stores raw data files in Cloud Storage in a bucket named 'raw-data'. After processing, the files are moved to a 'processed' bucket. To reduce costs, they want to automatically delete raw data older than 30 days. What should they do?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Configure a lifecycle rule on the 'raw-data' bucket to delete objects older than 30 days.
Option B is correct because Cloud Storage lifecycle management allows you to set a rule that automatically deletes objects after a specified number of days from their creation time. By configuring a lifecycle rule on the 'raw-data' bucket to delete objects older than 30 days, the company can achieve cost reduction without manual intervention. This directly addresses the requirement to remove raw data files that have been processed and are no longer needed.
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.
✗
Enable object versioning on the 'raw-data' bucket and configure a lifecycle rule to delete noncurrent versions.
Why it's wrong here
D is wrong because it addresses versions, not the current version.
✓
Configure a lifecycle rule on the 'raw-data' bucket to delete objects older than 30 days.
Why this is correct
A is correct because lifecycle management can automatically delete objects based on age.
Related concept
Read the scenario before looking for a memorised answer.
✗
Set a retention policy on the 'raw-data' bucket to expire objects after 30 days.
Why it's wrong here
B is wrong because a retention policy prevents deletion, not triggers it.
✗
Use a bucket policy that denies read access to objects older than 30 days.
Why it's wrong here
C is wrong because denying access does not delete the objects.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is confusing lifecycle deletion rules with retention policies or versioning: candidates often think retention policies delete data after a period, but they actually prevent deletion, while versioning with noncurrent deletion only removes old versions, not the current object.
Detailed technical explanation
How to think about this question
Cloud Storage lifecycle rules are evaluated daily and can use conditions based on object age (in days from creation), creation date, or storage class transitions. The deletion action is permanent and cannot be undone unless versioning is enabled and the object has noncurrent versions. In practice, you must ensure the lifecycle rule is applied to the correct bucket and that the age condition is set to 30 days, which triggers deletion at midnight UTC after the 30th day.
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.
Building and operationalizing data processing systems — This question tests Building and operationalizing data processing systems — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Configure a lifecycle rule on the 'raw-data' bucket to delete objects older than 30 days. — Option B is correct because Cloud Storage lifecycle management allows you to set a rule that automatically deletes objects after a specified number of days from their creation time. By configuring a lifecycle rule on the 'raw-data' bucket to delete objects older than 30 days, the company can achieve cost reduction without manual intervention. This directly addresses the requirement to remove raw data files that have been processed and are no longer needed.
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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