TempDB - 70GB (70GB free space) but cant shrink DB, restarted SQL - Service - still 70GB ... what can i do ?

Question

Hello Guys i've got a little problem here... because of some year end jobs the tempdb has grown up to 70GB. But from the 70GB only 4MB are used... i tried to shrink it down to 5gb (was in the beginning 5gb) didn't work... loging in in single user mode and
then tried to shrink it, didn't work... i restarted the sql service... tempDB still 70GB...
What else could i do ?
Has someone experienced this problem already ? Thanks for your help
Regards, Dominic

Answer 1

CAn you try the below steps?
1)DBCC SHRINKFILE ('tempdev', 1024)
The query executed successfully but the size of the database did not change.
2)SELECT * FROM sys.dm_exec_requests WHERE database_id = 2
No open transactions! Alright, any process holding locks on tempdb?
3)select * from sys.dm_tran_locks where resource_database_id= 2
No locks! There was a mention of sys.dm_db_session_space_usage DMV which helps to track the number of page allocation and deallocation by each session on the instance. Hence tried my luck with this query.
4)select * from sys.dm_db_session_space_usage where user_objects_alloc_page_count<> 0
Any session would use tempdb for creating some temporary objects. Since the database was not shrinking, obviously some user defined tables would be there
5)SELECT * FROM tempdb..sys.all_objectswhere is_ms_shipped = 0
Check for user tables on tempdb
After performing all the above steps, Space is big constraint than execute the below command to freeup the cache.
6)DBCC FREEPROCCACHE
This should free up tempdb
7)DBCC SHRINKFILE ('tempdev', 1024)
If this doesn't help then restart the sql server.
--Prashanth