BigQuery Data Warehousing Quiz for GCP Engineers

1. What is the primary purpose of using BigQuery snapshots?

To create backups of entire datasets

To clone tables at a specific point in time

To compress historical data

To partition large tables

2. In BigQuery, which join type is most efficient when joining a large fact table with a small dimension table?

INNER JOIN

LEFT JOIN

BROADCAST JOIN

CROSS JOIN

3. What is the recommended maximum number of columns for a BigQuery table to optimize query performance?

50 columns

100 columns

500 columns

No strict limit, design based on use case

4. Which BigQuery feature prevents accidental data deletion by retaining deleted data for a specified period?

Time travel

Data retention policy

Snapshot backup

Version control

5. True or False: BigQuery's query caching mechanism caches results for identical queries run within 24 hours.

True

False

6. In BigQuery, what does INFORMATION_SCHEMA allow you to do?

Query metadata about tables and datasets

Monitor real-time query performance

Encrypt sensitive data columns

Schedule automated queries

7. Which approach is most cost-effective for analyzing infrequently accessed historical data in BigQuery?

Keep all data in standard tables

Archive to Cloud Storage and use external tables

Use BigQuery Archive Storage tier

Both B and C

8. What is the maximum size of a single row in BigQuery?

1 MB

10 MB

100 MB

1 GB

9. True or False: BigQuery automatically deduplicates identical rows when inserting data via streaming.

True

False

10. Which BigQuery feature allows querying external data sources without loading them into BigQuery?

Federated queries

Linked datasets

External tables

Both A and C

11. What is the primary advantage of using clustering in BigQuery tables?

Reduces storage costs by compressing data

Improves query performance by co-locating related data

Automatically backs up table data

Eliminates the need for indexes

12. True or False: BigQuery materialized views automatically refresh when source tables are updated.

True

False

13. In BigQuery, which data type is most efficient for storing JSON-like nested structures?

STRING

STRUCT

ARRAY

BYTES

14. What is the recommended approach for handling slowly changing dimensions (SCD) in BigQuery data warehouses?

Use time-travel queries only

Implement Type 2 SCD with effective date columns

Completely replace dimension tables daily

Store all history in a single denormalized table

15. Which command is used to estimate the bytes that a BigQuery query will scan before execution?

EXPLAIN

DRY_RUN

ESTIMATE

PREVIEW

16. True or False: BigQuery automatically optimizes query execution plans based on data distribution and statistics.

True

False

17. What does BigQuery's 'slots' pricing model represent?

Cost per query executed

Reserved compute capacity billed hourly

Cost per GB of data scanned

Monthly subscription fee

18. Which of the following is NOT a benefit of using BigQuery's columnar storage format?

Faster query execution on subset of columns

Better compression ratios

Improved row-by-row insertion speed

Efficient aggregation queries

19. In BigQuery, what is the maximum number of columns you can include in a clustering key?

2

4

6

8

20. Which BigQuery feature allows you to split large tables into manageable segments based on a date or timestamp column?

Clustering

Partitioning

Sharding

Bucketing

Google Data Engineer BigQuery Data Warehousing Quiz

1. What is the primary purpose of using BigQuery snapshots?

2.

What first name or nickname would you like us to use?

2. In BigQuery, which join type is most efficient when joining a large fact table with a small dimension table?

3. What is the recommended maximum number of columns for a BigQuery table to optimize query performance?

4. Which BigQuery feature prevents accidental data deletion by retaining deleted data for a specified period?

5. True or False: BigQuery's query caching mechanism caches results for identical queries run within 24 hours.

6. In BigQuery, what does INFORMATION_SCHEMA allow you to do?

7. Which approach is most cost-effective for analyzing infrequently accessed historical data in BigQuery?

8. What is the maximum size of a single row in BigQuery?

9. True or False: BigQuery automatically deduplicates identical rows when inserting data via streaming.

10. Which BigQuery feature allows querying external data sources without loading them into BigQuery?

11. What is the primary advantage of using clustering in BigQuery tables?

12. True or False: BigQuery materialized views automatically refresh when source tables are updated.

13. In BigQuery, which data type is most efficient for storing JSON-like nested structures?

14. What is the recommended approach for handling slowly changing dimensions (SCD) in BigQuery data warehouses?

15. Which command is used to estimate the bytes that a BigQuery query will scan before execution?

16. True or False: BigQuery automatically optimizes query execution plans based on data distribution and statistics.

17. What does BigQuery's 'slots' pricing model represent?

18. Which of the following is NOT a benefit of using BigQuery's columnar storage format?

19. In BigQuery, what is the maximum number of columns you can include in a clustering key?

20. Which BigQuery feature allows you to split large tables into manageable segments based on a date or timestamp column?