数据库优化，性能分析

查询占用cpu最高的20条sql语句,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

查看死锁

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 '引起数据库死锁的是: '+ CAST(@bl AS VARCHAR(10)) + '进程号,其执行的SQL语法如下'

else

            select '进程号SPID：'+ CAST(@spid AS VARCHAR(10))+ '被' + '进程号SPID：'+ CAST(@bl AS VARCHAR(10)) +'阻塞,其当前进程执行的SQL语法如下'

DBCC INPUTBUFFER (@bl )

FETCH NEXT FROM s_cur INTO @spid,@bl

end

CLOSE s_cur

DEALLOCATE s_cur



exec sp_who2