Columnar vs Row Storage Engines Quiz

1. Which compression technique is most effective in columnar storage?

Run-length encoding

LZ4 compression

Dictionary encoding

Huffman coding

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3. Which factor most significantly impacts query performance difference between columnar and row storage?

Number of columns scanned vs columns in table

Total table size in GB

Number of indexes defined

Primary key cardinality

4. Row-based storage engines are typically used in OLTP systems because they optimize for frequent updates and small result sets.

True

False

Submit

6. Why do columnar engines struggle with UPDATE operations on multiple columns?

Each column is stored in separate files

Compression must be recomputed

Row IDs are not preserved

Only SELECT operations are supported

7. Select all true statements about row-based storage.

Ideal for bulk INSERT and UPDATE operations

Minimizes disk I/O for single-row retrievals

Provides superior compression for analytical queries

Supports efficient ACID transactions

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9. In row-based engines, what is the primary I/O bottleneck during analytical queries on large tables?

Reading unnecessary columns into memory

Sorting results by primary key

Network latency between nodes

Insufficient RAM cache

10. Columnar storage is better suited for data warehousing than row-based storage.

True

False

11. In a row-based storage engine, how is data physically organized on disk?

All values from one column stored together

All values from one row stored together

Random interleaving of column values

Sorted by primary key only

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13. Select all characteristics of columnar storage engines.

Excellent for OLAP workloads

High compression ratios

Optimal for single-row lookups

Better cache locality for analytical queries

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14. Columnar storage engines typically use vectorized query processing to improve CPU cache efficiency.

True

False

15. Which scenario favors row-based storage over columnar storage?

Aggregating sales totals across millions of rows

Updating multiple columns in a single customer record

Scanning one column for all records

Computing average product prices

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17. What is a major disadvantage of columnar storage for transactional INSERT operations?

Must update only one column at a time

Must reconstruct entire rows from multiple column files

Cannot support concurrent writes

Requires manual index maintenance

18. Row-based storage excels at OLTP workloads primarily because it retrieves entire records efficiently.

True

False

Submit

20. Which storage engine is optimized for analytical queries that scan specific columns?

Row-based storage

Columnar storage

Key-value storage

Document storage

DataSys+ Columnar vs Row Based Storage Engines Quiz

1. Which compression technique is most effective in columnar storage?

2.

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

2. Columnar storage achieves better performance than row storage on wide tables when queries select only a ____ subset of columns.

3. Which factor most significantly impacts query performance difference between columnar and row storage?

4. Row-based storage engines are typically used in OLTP systems because they optimize for frequent updates and small result sets.

5. Columnar storage requires ____ to reconstruct complete rows for result sets.

6. Why do columnar engines struggle with UPDATE operations on multiple columns?

7. Select all true statements about row-based storage.

8. Columnar storage engines store all values from a single column in ____ location(s).

9. In row-based engines, what is the primary I/O bottleneck during analytical queries on large tables?

10. Columnar storage is better suited for data warehousing than row-based storage.

11. In a row-based storage engine, how is data physically organized on disk?

12. Row-based storage minimizes I/O overhead for point queries because ____.

13. Select all characteristics of columnar storage engines.

14. Columnar storage engines typically use vectorized query processing to improve CPU cache efficiency.

15. Which scenario favors row-based storage over columnar storage?

16. In columnar storage, dictionary encoding reduces storage by ____.

17. What is a major disadvantage of columnar storage for transactional INSERT operations?

18. Row-based storage excels at OLTP workloads primarily because it retrieves entire records efficiently.

19. Columnar storage typically achieves higher compression ratios because ____.

20. Which storage engine is optimized for analytical queries that scan specific columns?