/*

-- 0. 高速压缩tempdb为初始值

USE tempdb

DBCC SHRINKFILE(2,TRUNCATEONLY);

*/

-- 1. tempdb以下未回收的暂时表 ,某些版本号可能查不到数据

use tempdb;

select * from sys.objects o where o.type like '%U%';

-- Chapter 7 - Knowing Tempdb

-- christian@coeo.com

-- Show tempdb usage by type across all files

SELECT  SUM(user_object_reserved_page_count) AS user_object_pages,

        SUM(internal_object_reserved_page_count) AS internal_object_pages,

        SUM(version_store_reserved_page_count) AS version_store_pages,

        total_in_use_pages = SUM(user_object_reserved_page_count)

        + SUM(internal_object_reserved_page_count)

        + SUM(version_store_reserved_page_count),

        SUM(unallocated_extent_page_count) AS total_free_pages

FROM    sys.dm_db_file_space_usage ;

-- Find the top 5 sessions running tasks that use tempdb

SELECT TOP 5

        *

FROM    sys.dm_db_task_space_usage

WHERE   session_id > 50

ORDER BY user_objects_alloc_page_count + internal_objects_alloc_page_count DESC ;

--return currently running T-SQL with Execution Plans

SELECT  session_id,

        text,

        query_plan

FROM    sys.dm_exec_requests

        CROSS APPLY sys.dm_exec_sql_text(sql_handle)

        CROSS APPLY sys.dm_exec_query_plan(plan_handle) ;

--view historic tempdb usage by session

SELECT  *

FROM    sys.dm_db_session_space_usage

WHERE   session_id > 50

ORDER BY user_objects_alloc_page_count + internal_objects_alloc_page_count DESC ;

-- Temp Tables Creation Rate

SELECT  *

FROM    sys.dm_os_performance_counters

WHERE   counter_name = 'Temp Tables Creation Rate' ;