SQL Server Questions and Answers – Data Compression

This set of SQL Server Multiple Choice Questions & Answers (MCQs) focuses on “Data Compression”.

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
View Answer

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
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3. Use _________ data compression to compress columnstore data with archival compression.
a) COLUMNSTOREARCHIVE
b) COLUMNSTORE_ARCHIVE
c) COLUMNSTORE
d) All of the mentioned
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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
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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
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6. The data_compression and data_compression_desc columns include ___________
a) COLUMNSTOREARCHIVE
b) COLUMNSTORE_ARCH
c) COLUMNSTORE
d) None of the mentioned
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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);

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
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9. sp_estimate_data_compression_savings requires ______ permission on the table.
a) UPDATE
b) SELECT
c) DELETE
d) None of the mentioned
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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’ ;
View Answer

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