數據庫優化，性能分析

查詢佔用cpu最高的20條sql語句,sql2008

SELECT TOP 10 a.creation_time,
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) b) AS query_text
FROM sys.dm_exec_query_stats a
ORDER BY [avg_cpu_cost] DESC

查看死鎖

use master
go
declare @spid int,@bl int
DECLARE s_cur CURSOR FOR 
select  0 ,blocked
from (select * from sysprocesses where  blocked>0 ) a 
where not exists(select * from (select * from sysprocesses where  blocked>0 ) b 
where a.blocked=spid)
union select spid,blocked from sysprocesses where  blocked>0
OPEN s_cur
FETCH NEXT FROM s_cur INTO @spid,@bl
WHILE @@FETCH_STATUS = 0
begin
if @spid =0 
            select '引發數據庫死鎖的是: '+ CAST(@bl AS VARCHAR(10)) + '進程號,其執行的SQL語法以下'
else
            select '進程號SPID：'+ CAST(@spid AS VARCHAR(10))+ '被' + '進程號SPID：'+ CAST(@bl AS VARCHAR(10)) +'阻塞,其當前進程執行的SQL語法以下'
DBCC INPUTBUFFER (@bl )
FETCH NEXT FROM s_cur INTO @spid,@bl
end
CLOSE s_cur
DEALLOCATE s_cur

exec sp_who2