A new column, tempdbname, displays temporary database names of all active sessions.
sp_who fid spid status loginame origname hostname blk_spid dbname tempdbname cmd block_xloid --- ---- -------- -------- -------- -------- -------- ------ ---------- ----------------- ----------- 0 2 sleeping NULL NULL NULL 0 master tempdb DEADLOCK TUNE 0 0 3 sleeping NULL NULL NULL 0 master tempdb SHUTDOWN HANDLER 0 0 4 sleeping NULL NULL NULL 0 master tempdb ASTC HANDLER 0 0 5 sleeping NULL NULL NULL 0 master tempdb CHECKPOINT SLEEP 0