(auch wenn der service noch nicht)

ALTER DATABASE [tempdb] MODIFY FILE (  
NAME = N'tempdev',  
SIZE = 1024KB );  


SELECT DB_NAME(DATABASE_ID)DBNAME, [NAME] LOGICAL_FILENAME, size *8/1024 SIZE_MB
FROM MASTER.SYS.MASTER_FILES
WHERE DB_NAME(DATABASE_ID) = 'TEMPDB'