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Moving the tempdb database

Written by Bill Graziano on 05 November 2007

Moving the tempdb database in SQL Server is a simple process but does require the service to be restarted.

By default, the tempdb database is created in the same location as master, model and msdb.  tempdb is used to store temporary user created objects (e.g. temp tables), temporary internal objects (e.g. work tables for sorting) and any row version data.  Each time SQL Server is started all the objects in tempdb are deleted but the file sizes are retained.  People primarily want to move tempdb to increase performance or deal with file size issues.

The first step is to determine the logical file names of of the data files for tempdb.  You can run the following command in SQL Server 2000 or SQL Server 2005:

USE tempdb
GO
EXEC sp_helpfile
GO


name      fileid filename                      
--------- ------ -------------------------------
tempdev        1 c:\Data\MSSQL\data\tempdb.mdf 
templog        2 c:\Data\MSSQL\data\templog.ldf

I've omitted some extra columns from the result set.  The logical names always seem to be tempdev and templog.  Knowing this we can run the following ALTER DATABASE statement in SQL Server 2000 or SQL Server 2005 to move tempdb.  Set the FILENAME parameter to the location where you'd like each file.

USE master
GO
ALTER DATABASE tempdb 
	MODIFY FILE (NAME = tempdev, FILENAME = 'C:\tempdb2005.mdf')
GO
ALTER DATABASE tempdb 
	MODIFY FILE (NAME = templog, FILENAME = 'C:\tempdb2005.ldf')
GO

SQL Server will return a message indicating that the old files can be deleted after restarting SQL Server or that the new files will be available after the database is restarted depending on which version of SQL Server you're using.  In either case, you'll need to restart SQL Server for the change to take effect.