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ACE Practice Question: A BigQuery table in a data pipeline receives…
This ACE practice question tests your understanding of a bigquery table in a data pipeline receives…. 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 BigQuery table in a data pipeline receives daily data loads. To control storage costs, the team wants table data older than 180 days to be automatically deleted at the table level, not the dataset level. How should this be configured?
Answer choices
Why each option matters
Good practice is not just finding the correct option. The wrong answers often show the exact trap the exam wants you to fall into.
A
Distractor review
Set a dataset-level default table expiration of 180 days in the dataset properties
Dataset-level default expiration applies to new tables created in the dataset — it doesn't apply retroactively to existing tables. The question asks about table-level configuration.
B
Distractor review
Use a Cloud Scheduler job to run a DELETE statement on rows older than 180 days nightly
Row-level DELETE queries incur compute costs and don't reduce storage efficiently — partition expiration or table expiration is the managed alternative.
C
Best answer
Configure partition expiration on a date-partitioned table to expire partitions after 180 days
For date-partitioned tables, partition expiration automatically deletes partitions older than the specified number of days — the most efficient and zero-maintenance approach for time-series data.
D
Distractor review
Set a table-level TTL using BigQuery's TTL API with a 180-day value
BigQuery doesn't have a 'TTL API' as such — table expiration is set via `expiration_time` on table metadata or partition expiration on partitioned tables.
Common exam trap
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Technical deep dive
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
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.
- Use explanations to understand the rule behind the answer.
TExam Day Tips
- Underline the problem statement mentally.
- 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.
Related practice questions
Related ACE practice-question pages
Use these pages to review the topic behind this question. This is how one missed question becomes focused revision.
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Keep practising from the same exam bank, or move into a focused topic page if this question exposed a weak area.
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FAQ
Questions learners often ask
What does this ACE question test?
Read the scenario before looking for a memorised answer.
What is the correct answer to this question?
The correct answer is: Configure partition expiration on a date-partitioned table to expire partitions after 180 days — BigQuery table expiration can be set at the table level using the `expiration_time` field or via the partition expiration setting (for partitioned tables). For standard tables, setting a table expiration date causes BigQuery to automatically delete the table after the specified time.
What should I do if I get this ACE question wrong?
Identify which ACE exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
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