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Shrinking a Database
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The following two practices walk you through the processes of setting a database to shrink automatically and manually shrinking a database.
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Practice 1: Set a Database to Shrink Automatically
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In this practice, you will use the ALTER DATABASE statement to set a database to shrink automatically. 1. If necessary, start SSMS and connect to the instance containing the AdventureWorks sample database. Open the Query Editor pane.
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Using Transact-SQL to Manage Databases
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2. In the Query Editor pane, type the following Transact-SQL statements to check the current auto shrink setting for the database, set the database to shrink automatically, and then verify that the auto shrink setting was changed:
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USE master; --View the current setting for the database. SELECT CASE DATABASEPROPERTYEX( AdventureWorks , IsAutoShrink ) WHEN 0 THEN Database is not set to shrink automatically WHEN 1 THEN Database is set to shrink automatically ELSE Error END; --Set the database to shrink automatically. ALTER DATABASE AdventureWorks SET AUTO_SHRINK ON; --View the current setting for the database. SELECT CASE DATABASEPROPERTYEX( AdventureWorks , IsAutoShrink ) WHEN 0 THEN Database is not set to shrink automatically WHEN 1 THEN Database is set to shrink automatically ELSE Error END;
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Practice 2: Manually Shrink a Database
In this practice, you will use the DBCC SHRINKDATABASE statement to manually shrink a database. 1. If necessary, start SSMS and connect to the instance containing the AdventureWorks sample database. Open the Query Editor pane. 2. In the Query Editor pane, perform the following operations by typing the Transact-SQL statements that follow the list of operations:
View the current size of the database. Create and then drop a table to create unused database space so that you can shrink the database. Check the size of the database. Manually shrink the database. Check the size of the database after shrinking it.
Lesson 3: Shrinking Files
USE AdventureWorks; --View the current size of the database. SELECT file_id, name, physical_name, size FROM sys.database_files; --Create a table, fill the table, and then drop to table to create unused database space. CREATE TABLE dropme ( col1 CHAR(8000) ) DECLARE @counter INTEGER SET @counter = 2000 WHILE @counter > 0 BEGIN INSERT INTO dropme VALUES ( ) SET @counter = @counter - 1 END --View the current size of the database. SELECT file_id, name, physical_name, size FROM sys.database_files; --Drop the table. DROP TABLE dropme; --Shrink the AdventureWorks database, leaving no free space. DBCC SHRINKDATABASE (AdventureWorks, 0); --View the current size of the database. SELECT file_id, name, physical_name, size FROM sys.database_files;
Lesson Summary
You can shrink SQL Server 2005 databases to regain disk space. DBAs have the option of shrinking the database manually or allowing the database engine to automatically shrink the database. You can shrink an entire database by using the DBCC SHRINKDATABASE statement or individual database files by using the DBCC SHRINKFILE statement. As part of your database maintenance, you can also shrink database transaction logs.
12
Using Transact-SQL to Manage Databases
Lesson Review
The following questions are intended to reinforce key information presented in this lesson. The questions are also available on the companion CD if you prefer to review them in electronic form.
NOTE
Answers
Answers to these questions and explanations of why each answer choice is right or wrong are located in the Answers section at the end of the book.
1. You are a DBA working at a SQL Server hosting company. You need to ensure that none of your company s client installations wastes disk space. As part of your maintenance tasks, you are charged with periodically shrinking databases. You want to automatically shrink entire databases at a time. How can you achieve this maintenance goal A. Execute the DBCC SHRINKDATABASE statement. B. Execute the DBCC SHRINKFILE statement. C. Set each database to shrink automatically by using the ALTER DATABASE statement against each database. D. You cannot shrink SQL Server 2005 database files automatically. 2. You need to ensure that none of your databases contains unused space because recent database growth is quickly filling up disk space. How can you shrink individual database files during the night when the system is not being used by your end users A. Create a job that will execute the DBCC SHRINKFILE statement against the individual files during the night. B. Execute the ALTER DATABASE statement to allow the database to be shrunk only at night. C. Execute the DBCC SHRINKDATABASE statement, specifying the time you want the database to be shrunk. D. Alter the database to allow the database engine to automatically shrink the database.
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