You can adjust the tempdb file(s) size using the following commands. The changes will be in effect the next time SQL Server starts.
--EXEC tempdb.sys.sp_helpfile --to list the logical file names, if you need to
-- names in bold below must be the correct logical names
-- be sure to specify exactly the same size for all tempdb data files
ALTER DATABASE tempdb MODIFY FILE ( NAME = tempdev, SIZE = <nnnnnn>KB )
ALTER DATABASE tempdb MODIFY FILE ( NAME = tempdev2, SIZE = <nnnnnn>KB )
--...
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