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Data Compression interview questions
Data Compression interview questions
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Total Questions: 10
1. Which of the following compression type is supported by SQL Server 2014 ?
A. Row
B. Column
C. Both row and column
D. None of the mentioned
Show Correct Answer
Correct Answer is :
Both row and column
2. Point out the correct statement :
A. The details of data compression are subject to change without notice in service packs or subsequent releases
B. Compression is not available for system tables
C. If you specify a list of partitions or a partition that is out of range, an error will be generated
D. All of the mentioned
Show Correct Answer
Correct Answer is :
All of the mentioned
3. Use _________ data compression to compress columnstore data with archival compression.
A. COLUMNSTOREARCHIVE
B. COLUMNSTORE_ARCHIVE
C. COLUMNSTORE
D. All of the mentioned
Show Correct Answer
Correct Answer is :
COLUMNSTORE_ARCHIVE
4. To remove archival compression and restore the data to columnstore compression :
A. Use ALTER TABLE
B. Use ALTER COLUMN
C. Use ALTER DATABASE
D. All of the mentioned
Show Correct Answer
Correct Answer is :
Use ALTER TABLE
5. Point out the wrong statement :
A. You can enable or disable ROW or PAGE compression in online state only
B. When you are compressing indexes, leaf-level pages can be compressed with both row and page compression
C. Non–leaf-level pages do not receive page compression
D. None of the mentioned
Show Correct Answer
Correct Answer is :
You can enable or disable ROW or PAGE compression in online state only
6. The data_compression and data_compression_desc columns include :
A. COLUMNSTOREARCHIVE
B. COLUMNSTORE_ARCH
C. COLUMNSTORE
D. None of the mentioned
Show Correct Answer
Correct Answer is :
COLUMNSTORE
7. Which of the following code is used to enable compression on a table ?
A. EXEC sp_estimate_compression_savings 'Production', 'TransactionHistory', NULL, NULL, 'ROW' ; ALTER TABLE Production.TransactionHistory REBUILD PARTITION = ALL WITH (DATA_COMPRESSION = ROW);
B. EXEC sp_estimate_compression_savings 'Production', 'TransactionHistory', NULL, NULL, 'ROW' ; ALTER TABLE Production.TransactionHistory REBUILD PARTITION = ALL WITH (DATA_COMPRESSION = ROW);
C. EXEC sp_estimate_compression_savings 'Production', 'TransactionHistory', NULL, NULL, 'ROW' ; ALTER TABLE Production.TransactionHistory BUILD PARTITION = ALL WITH (DATA_COMPRESSION = ROW);
D. EXEC sp_estimate_compression 'Production', 'TransactionHistory', NULL, NULL, 'ROW' ; ALTER TABLE Production.TransactionHistory REBUILD PARTITION = ALL WITH (DATA_COMPRESSION = ROW);
Show Correct Answer
Correct Answer is :
EXEC sp_estimate_compression_savings 'Production', 'TransactionHistory', NULL, NULL, 'ROW' ; ALTER TABLE Production.TransactionHistory REBUILD PARTITION = ALL WITH (DATA_COMPRESSION = ROW);
8. What is the purpose of schema name in the following code syntax ? sp_estimate_data_compression_savings [ @schema_name = ] 'schema_name' , [ @object_name = ] 'object_name' , [@index_id = ] index_id , [@partition_number = ] partition_number , [@data_compression = ] 'data_compression' [;]
A. Name of the table
B. Name of the database schema
C. Name of the indexed view
D. All of the mentioned
Show Correct Answer
Correct Answer is :
Name of the database schema
9. sp_estimate_data_compression_savings requires ______ permission on the table.
A. UPDATE
B. SELECT
C. DELETE
D. None of the mentioned
Show Correct Answer
Correct Answer is :
SELECT
10. Which of the following query estimates the size of the Production.WorkOrderRouting table if it is compressed by using ROW compression ?
A. EXEC sp_estimate_data_compression_savings ‘Production’, ‘WorkOrderRouting’, NULL, NULL, ‘ROW’ ;
B. EXEC sp_estimate_data_compression_savings ‘Production’, ‘WorkOrderRouting’, NULL, 1, ‘ROW’ ;
C. EXEC sp_estimate_data_compression_savings ‘Production’, ‘WorkOrderRouting’, 1, NULL, ‘ROW’ ;
D. EXEC sp_estimate_data_compression_savings ‘Production’, ‘WorkOrderRouting’, NULL, NULL, ‘COLUMN’ ;
Show Correct Answer
Correct Answer is :
EXEC sp_estimate_data_compression_savings ‘Production’, ‘WorkOrderRouting’, NULL, NULL, ‘ROW’ ;
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