MS SQL Server - 94 - Columnstore Index MCQ

94 – Columnstore Index MCQ

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1. What is the primary purpose of a columnstore index in SQL Server?

A. To sort rows in a table

B. To create a primary key constraint

D. To encrypt column data

C. To optimize query performance for analytical workloads

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2. In SQL Server, which type of index stores column data in a columnar format?

B. Non-clustered index

D. Filtered index

A. Clustered index

C. Columnstore index

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3. What is the benefit of using columnstore indexes for data warehousing queries?

A. Improved data encryption

D. Simplified query writing

C. Faster query performance for analytical queries

B. Reduced storage space requirements

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4. In SQL Server, when is it recommended to use a columnstore index?

D. For queries that perform aggregations and scans on large datasets

C. For queries that involve frequent data modifications

A. For OLTP workloads

B. For small datasets

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5. What is the main advantage of a columnstore index over traditional row-based indexes in SQL Server?

D. Simplified data retrieval

C. Improved query performance for OLTP workloads

A. Faster data encryption

B. Reduced storage space requirements

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6. In SQL Server, what is a columnstore segment?

D. A clustered index

A. A subset of columns in a table

B. A storage unit for column data in a columnstore index

C. A filtered index

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7. Which SQL Server feature allows you to create and manage columnstore indexes?

A. Query Store

C. Partitioning

B. Indexing

D. Columnstore Index Wizard

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8. What is the purpose of a clustered columnstore index in SQL Server?

C. To physically store data in a columnar format

D. To improve query performance for analytical queries

A. To enforce data integrity constraints

B. To define a primary key constraint

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9. In SQL Server, which edition supports the use of columnstore indexes?

A. SQL Server Express Edition

B. SQL Server Standard Edition

C. SQL Server Developer Edition

D. SQL Server Enterprise Edition

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10. What is the primary benefit of using a non-clustered columnstore index in SQL Server?

C. Faster data modification operations

B. Reduced storage space requirements

A. Improved data encryption

D. Enhanced query performance for analytical queries

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11. In SQL Server, what happens to a table’s existing indexes when you create a columnstore index on the table?

A. The existing indexes are removed.

C. The existing indexes are disabled.

B. The existing indexes are converted to columnstore indexes.

D. The existing indexes are unaffected.

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12. What is the main consideration when creating a columnstore index in SQL Server?

B. The size of the table

C. The column data types in the table

D. The number of columns in the table

A. The number of rows in the table

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13. In SQL Server, what is a batch execution mode for columnstore indexes?

C. A method for parallel data encryption

B. A method for processing large sets of rows at once

D. A method for querying encrypted data

A. A method for row-based processing

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14. What is the purpose of the Columnstore Tuple Mover in SQL Server?

C. To enforce data integrity constraints

A. To create non-clustered indexes

D. To create primary key constraints

B. To organize and compress columnstore segments

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15. In SQL Server, which command is used to rebuild a columnstore index to optimize its performance?

C. DROP INDEX

A. ALTER INDEX REBUILD

B. CREATE INDEX

D. UPDATE INDEX

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16. What is the benefit of using the INCLUDE clause when creating a non-clustered columnstore index in SQL Server?

B. It includes encrypted columns in the index.

C. It includes columns from a foreign key relationship.

A. It includes additional columns in the index for faster data retrieval.

D. It includes columns from a clustered index.

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17. In SQL Server, what is the purpose of the column elimination feature in columnstore indexes?

A. To remove entire columns from a table

D. To exclude columns from query execution

C. To eliminate duplicate values in a column

B. To reduce the number of rows in a table

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18. What is the primary benefit of using a filtered columnstore index in SQL Server?

C. Simplified query writing

D. Enhanced data encryption

A. Reduced storage space requirements

B. Improved query performance for OLTP workloads

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19. In SQL Server, which system view allows you to monitor and manage columnstore indexes?

B. sys.columns

C. sys.dm_db_column_store_row_group_physical_stats

D. sys.dm_db_index_physical_stats

A. sys.indexes

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20. How does the columnstore index compression method differ from traditional row-based indexes in SQL Server?

B. Columnstore indexes use horizontal compression, while row-based indexes use vertical compression.

A. Columnstore indexes use vertical compression, while row-based indexes use horizontal compression.

C. Columnstore indexes use no compression, while row-based indexes use both horizontal and vertical compression.

D. Columnstore indexes use the same compression method as row-based indexes.

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21. In SQL Server, what is a limitation of using columnstore indexes?

D. They cannot be used with all data types.

B. They cannot be used in tables with less than 1 million rows.

C. They cannot be used in conjunction with clustered indexes.

A. They cannot be used with any edition other than Enterprise Edition.

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22. What is the primary use case for batch mode adaptive joins in SQL Server columnstore indexes?

A. To enforce data integrity constraints

B. To reduce storage space requirements

C. To improve query performance for analytical workloads

D. To simplify query writing

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23. In SQL Server, which feature allows you to control the level of parallelism for columnstore index operations?

C. Partitioning

D. Locking

B. MAXDOP option

A. Query Store

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24. What is the purpose of the COLUMNSTORE_ARCHIVE compression level for columnstore indexes in SQL Server?

A. To compress column data to the highest degree

D. To create a non-clustered index

B. To disable compression for faster query performance

C. To encrypt column data

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25. In SQL Server, how can you determine the fragmentation level of a columnstore index?

B. By using the sp_spaceused system stored procedure

A. By querying the sys.dm_db_column_store_row_group_physical_stats dynamic management view

C. By checking the index properties in SQL Server Management Studio

D. By running the DBCC CHECKDB command

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MS SQL Server – 94 – Columnstore Index MCQ