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ACE Practice Question: A data warehouse team queries a 10 TB BigQuery…
This ACE practice question tests your understanding of a data warehouse team queries a 10 tb bigquery…. 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 data warehouse team queries a 10 TB BigQuery table containing billions of events with a date column. Most queries filter by a date range (e.g., last 30 days). Without any partitioning, queries scan the full 10 TB every time. Which BigQuery feature eliminates unnecessary data scanning for date-range queries?
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
Best answer
Date/timestamp partitioned table on the date column
Partitioning by date divides the table into daily (or monthly) segments. Queries with date range filters only scan the relevant partitions, avoiding full table scans and reducing cost.
B
Distractor review
Increasing BigQuery slot reservations for faster full-table scans
More slots increase query speed by parallelizing work, but don't reduce the amount of data scanned — costs remain the same and full-table scans still occur.
C
Distractor review
BigQuery table clustering on the date column
Clustering sorts data within each partition by column values — it helps with filter pruning within a partition but doesn't create partition-level boundaries. Partitioning is needed to eliminate whole date ranges.
D
Distractor review
Creating a materialized view for the last 30 days
Materialized views cache query results and auto-refresh — useful for frequently run queries, but don't reduce scanning on the base table for ad-hoc date-range queries.
Common exam trap
Common exam trap: NAT rules depend on direction and matching traffic
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Technical deep dive
How to think about this question
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
KKey Concepts to Remember
- Static NAT maps one inside address to one outside address.
- PAT allows many inside hosts to share one public address using ports.
- Inside local and inside global describe the private and translated addresses.
- NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
- Identify inside and outside interfaces first.
- Check whether the scenario needs static NAT, dynamic NAT or PAT.
- Do not confuse NAT matching ACLs with normal packet-filtering intent.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
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FAQ
Questions learners often ask
What does this ACE question test?
Static NAT maps one inside address to one outside address.
What is the correct answer to this question?
The correct answer is: Date/timestamp partitioned table on the date column — BigQuery table partitioning divides a table into segments by a column value (date, timestamp, or integer range). When a query filters on the partitioning column, BigQuery scans only the relevant partitions — dramatically reducing bytes processed and cost for date-range queries.
What should I do if I get this ACE question wrong?
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related ACE NAT questions on configuration and troubleshooting.
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