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--ͨ¹ýÖ´ÐÐÈçϵÄDMV²éѯ¿ÉÒԵõ½Õâ¸öÐÅÏ¢
SELECT COUNT(*) AS workers_waiting_for_cpu,t2.scheduler_id
from sys.dm_os_workers AS t1, sys.dm_os_schedulers AS t2
WHERE t1.state='RUNNABLE' AND 
t1.scheduler_address = t2.scheduler_address AND
 t2.scheduler_id<255
GROUP BY t2.scheduler_id
--Ò²¿ÉÒÔÖ´ÐÐÈçϵIJéѯµÃµ½¹¤×÷½ø³ÌÔÚ¿ÉÔËÐÐ״̬Ï»¨·ÑµÄʱ¼ä
SELECT SUM(signal_wait_time_ms) from sys.dm_os_wait_stats
--ÏÂÃæÊÇÒ»¸öDMV²éѯ£¬Ëü¿ÉÒÔÓÃÀ´ÕÒ³öÿ´ÎÖ´ÐÐÖÐÕ¼ÓÃCPU×î¶àµÄÇ®10Ϊ²éѯ£¬
--Ò²ÁгöÁËSQLÓï¾äµÄ²éѯ¼Æ»®¼°¼Æ»®±»Ö´ÐеĴÎÊý¡£Èç¹ûÒ»¸ö²éѯ´ó¼ÒËä¸ß£¬
--µ«Ö´ÐдÎÊýÉÙ£¬ÄÇÒ²¿ÉÒÔ²ÉÄÉ¡£
SELECT TOP 10
total_worker_time/execution_count AS avg_cpu_cost, plan_handle,execution_count,
    (SELECT SUBSTRING(text,statement_start_offset/2+1,
        (CASE WHEN statement_end_offset=-1
        THEN LEN(CONVERT(NVARCHAR(max),text))*2
        ELSE statement_end_offset
        END -statement_start_offset)/2)
    from sys.dm_exec_sql_text(sql_handle)
    ) AS query_text
from sys.dm_exec_query_stats
ORDER BY [avg_cpu_cost] DESC
--ÒÔÉÏDMVÖ»ÏÔʾµ±Ç°±»»º´æµÄ²éѯºÏ¼ÆÍ³¼ÆÐÅÏ¢
--ΪÁËÕÒ³ö¹¤×÷¸ººÉÖÐÔËÐÐ×îÆµ·±µÄ²éѯ£¬¾ÍÐèÒªÖ´ÐÐÏÂÃæµÄDMV²éѯ¡£
SELECT TOP 10 total_worker_time ,plan_handle,execution_count,
    (SELECT SUBSTRING(text,statement_start_offset/2+1,
        (CASE WHEN statement_end_offset=-1
        THEN LEN(CONVERT(NVARCHAR(max),text))*2
        ELSE statement_end_offset
        END -statement_start_offset)/2)
    from sys.dm_exec_sql_text(sql_handle)
    ) AS query_text
from sys.dm_exec_query_stats ORDER BY execution_count
--SQL ServerÔÚÓÅ»¯²éѯ¼Æ»®ÉÏ»¨·ÑµÄʱ¼ä¿ÉÒÔÓÃÏÂÃæµÄDM


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