DBCC Shrinkfile

Examples

A. Shrinking a data file to a specified target size

The following example shrinks the size of a data file named DataFile1 in the UserDB user database to 7 MB.

USE UserDB; 
GO 
DBCC SHRINKFILE (DataFile1, 7); 
GO

B. Shrinking a log file to a specified target size

The following example shrinks the log file in the AdventureWorks database to 1 MB. To allow the DBCC SHRINKFILE command to shrink the file, the file is first truncated by setting the database recovery model to SIMPLE.

USE AdventureWorks2012;  
GO  
-- Truncate the log by changing the database recovery model to SIMPLE.  
ALTER DATABASE AdventureWorks2012  
SET RECOVERY SIMPLE;  
GO  
-- Shrink the truncated log file to 1 MB.  
DBCC SHRINKFILE (AdventureWorks2012_Log, 1);  
GO  
-- Reset the database recovery model.  
ALTER DATABASE AdventureWorks2012  
SET RECOVERY FULL;  
GO  

C. Truncating a data file

The following example truncates the primary data file in the AdventureWorks database. The sys.database_files catalog view is queried to obtain the file_id of the data file.

USE AdventureWorks2012;  
GO  
SELECT file_id, name  
FROM sys.database_files;  
GO  
DBCC SHRINKFILE (1, TRUNCATEONLY);  

D. Emptying a file

The following example demonstrates the procedure for emptying a file so that it can be removed from the database. For the purposes of this example, a data file is first created and it is assumed that the file contains data.

USE AdventureWorks2012;  
GO  
-- Create a data file and assume it contains data.  
ALTER DATABASE AdventureWorks2012   
ADD FILE (  
    NAME = Test1data,  
    FILENAME = 'C:\t1data.ndf',  
    SIZE = 5MB  
    );  
GO  
-- Empty the data file.  
DBCC SHRINKFILE (Test1data, EMPTYFILE);  
GO  
-- Remove the data file from the database.  
ALTER DATABASE AdventureWorks2012  
REMOVE FILE Test1data;  
GO