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MS SQL Server - Microsoft SQL Server - System database - TempDb
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  Identify TempDb usage

Following query will provide information about TempDb usage. Analyzing the counts you can identify which thing is impacting TempDb

SELECT
 SUM (user_object_reserved_page_count)*8 as usr_obj_kb,
 SUM (internal_object_reserved_page_count)*8 as internal_obj_kb,
 SUM (version_store_reserved_page_count)*8  as version_store_kb,
 SUM (unallocated_extent_page_count)*8 as freespace_kb,
 SUM (mixed_extent_page_count)*8 as mixedextent_kb
FROM sys.dm_db_file_space_usage

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  TempDB database details

Below query can be used to get TempDB database details:

USE [MASTER]
SELECT * FROM sys.databases WHERE database_id = 2

OR

USE [MASTER]
SELECT * FROM sys.master_files WHERE database_id = 2

With the help of below DMV, you can check how much TempDb space does your session is using. This query is quite helpful while debugging TempDb issues

SELECT * FROM sys.dm_db_session_space_usage WHERE session_id = @@SPID



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