T-SQL- check TEMPDB usage

You can monitoring TEMPDB usage using the following SQL statement.

SELECT  COALESCE(T1.session_id, T2.session_id) [session_id] ,        T1.request_id ,
        COALESCE(T1.database_id, T2.database_id) [database_id],
        COALESCE(T1.[Total Allocation User Objects], 0)
        + T2.[Total Allocation User Objects] [Total Allocation User Objects] ,
        COALESCE(T1.[Net Allocation User Objects], 0)
        + T2.[Net Allocation User Objects] [Net Allocation User Objects] ,
        COALESCE(T1.[Total Allocation Internal Objects], 0)
        + T2.[Total Allocation Internal Objects] [Total Allocation Internal Objects] ,
        COALESCE(T1.[Net Allocation Internal Objects], 0)
        + T2.[Net Allocation Internal Objects] [Net Allocation Internal Objects] ,
        COALESCE(T1.[Total Allocation], 0) + T2.[Total Allocation] [Total Allocation] ,
        COALESCE(T1.[Net Allocation], 0) + T2.[Net Allocation] [Net Allocation] ,
        COALESCE(T1.[Query Text], T2.[Query Text]) [Query Text]
FROM    ( SELECT    TS.session_id ,
                    TS.request_id ,
                    TS.database_id ,
                    CAST(TS.user_objects_alloc_page_count / 128 AS DECIMAL(15,
                                                              2)) [Total Allocation User Objects] ,
                    CAST(( TS.user_objects_alloc_page_count
                           - TS.user_objects_dealloc_page_count ) / 128 AS DECIMAL(15,
                                                              2)) [Net Allocation User Objects] ,
                    CAST(TS.internal_objects_alloc_page_count / 128 AS DECIMAL(15,
                                                              2)) [Total Allocation Internal Objects] ,
                    CAST(( TS.internal_objects_alloc_page_count
                           - TS.internal_objects_dealloc_page_count ) / 128 AS DECIMAL(15,
                                                              2)) [Net Allocation Internal Objects] ,
                    CAST(( TS.user_objects_alloc_page_count
                           + internal_objects_alloc_page_count ) / 128 AS DECIMAL(15,
                                                              2)) [Total Allocation] ,
                    CAST(( TS.user_objects_alloc_page_count
                           + TS.internal_objects_alloc_page_count
                           - TS.internal_objects_dealloc_page_count
                           - TS.user_objects_dealloc_page_count ) / 128 AS DECIMAL(15,
                                                              2)) [Net Allocation] ,
                    T.text [Query Text]
          FROM      sys.dm_db_task_space_usage TS
                    INNER JOIN sys.dm_exec_requests ER ON ER.request_id = TS.request_id
                                                          AND ER.session_id = TS.session_id
                    OUTER APPLY sys.dm_exec_sql_text(ER.sql_handle) T
        ) T1
        RIGHT JOIN ( SELECT SS.session_id ,
                            SS.database_id ,
                            CAST(SS.user_objects_alloc_page_count / 128 AS DECIMAL(15,
                                                              2)) [Total Allocation User Objects] ,
                            CAST(( SS.user_objects_alloc_page_count
                                   - SS.user_objects_dealloc_page_count )
                            / 128 AS DECIMAL(15, 2)) [Net Allocation User Objects] ,
                            CAST(SS.internal_objects_alloc_page_count / 128 AS DECIMAL(15,
                                                              2)) [Total Allocation Internal Objects] ,
                            CAST(( SS.internal_objects_alloc_page_count
                                   - SS.internal_objects_dealloc_page_count )
                            / 128 AS DECIMAL(15, 2)) [Net Allocation Internal Objects] ,
                            CAST(( SS.user_objects_alloc_page_count
                                   + internal_objects_alloc_page_count ) / 128 AS DECIMAL(15,
                                                              2)) [Total Allocation] ,
                            CAST(( SS.user_objects_alloc_page_count
                                   + SS.internal_objects_alloc_page_count
                                   - SS.internal_objects_dealloc_page_count
                                   - SS.user_objects_dealloc_page_count )
                            / 128 AS DECIMAL(15, 2)) [Net Allocation] ,
                            T.text [Query Text]
                     FROM   sys.dm_db_session_space_usage SS
                            LEFT JOIN sys.dm_exec_connections CN ON CN.session_id = SS.session_id
                            OUTER APPLY sys.dm_exec_sql_text(CN.most_recent_sql_handle) T
                   ) T2 ON T1.session_id = T2.session_id
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