use tempdb
GO

DBCC FREEPROCCACHE — clean cache
DBCC DROPCLEANBUFFERS — clean buffers
DBCC FREESYSTEMCACHE (‘ALL’) — clean system cache
DBCC FREESESSIONCACHE — clean session cache
DBCC SHRINKDATABASE(tempdb, 10); — shrink tempdb
dbcc shrinkfile (‘tempdev’) — shrink db file
dbcc shrinkfile (‘templog’) — shrink log file
GO

— report the new file sizes
SELECT name, size
FROM sys.master_files
WHERE database_id = DB_ID(N’tempdb’);
GO