tempdb 相关总结

/*
-- 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_requestsCROSS 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' ;