1 找出效率低的语句
SELECT TOP 10
qs.total_worker_time ,qs.total_logical_reads,qs.last_logical_writes, qs.plan_handle,
qs.execution_count,
(SELECT SUBSTRING(text, qs.statement_start_offset/2 + 1,
(CASE WHEN qs.statement_end_offset = -1
THEN LEN(CONVERT(nvarchar(max), text)) * 2
ELSE qs.statement_end_offset
END - qs.statement_start_offset)/2)
FROM sys.dm_exec_sql_text(sql_handle)) AS query_text
FROM sys.dm_exec_query_stats qs
ORDER BY total_worker_time DESC
qs.total_worker_time ,qs.total_logical_reads,qs.last_logical_writes, qs.plan_handle,
qs.execution_count,
(SELECT SUBSTRING(text, qs.statement_start_offset/2 + 1,
(CASE WHEN qs.statement_end_offset = -1
THEN LEN(CONVERT(nvarchar(max), text)) * 2
ELSE qs.statement_end_offset
END - qs.statement_start_offset)/2)
FROM sys.dm_exec_sql_text(sql_handle)) AS query_text
FROM sys.dm_exec_query_stats qs
ORDER BY total_worker_time DESC
2 查看这些语句对应的client, hostname,loginname
select s.host_name,s.PROGRAM_NAME,s.login_name, t.text From sys.dm_exec_requests r
cross apply
sys.dm_exec_sql_text(r.sql_handle) t
inner join sys.dm_exec_sessions s on r.session_id=s.session_id
where t.text like '%sqlstatement%'----- place your sql statement here
and s.session_id<>@@SPID
cross apply
sys.dm_exec_sql_text(r.sql_handle) t
inner join sys.dm_exec_sessions s on r.session_id=s.session_id
where t.text like '%sqlstatement%'----- place your sql statement here
and s.session_id<>@@SPID
3确定这些语句隶属的存储过程
通过第一步得到的plan_handle,代入dm_exec_query_plan，得到具体的存储过程的名称。如果返回空，则说明该语句是ad-hoc或者是prepared或者是在存储过程内部使用批结字符串弄出来的语句。如果是以上几种情况，我们是无法定位对象的，只能让程序员们逐个排查了
select OBJECT_NAME(objectid) from sys.dm_exec_query_plan ( plan_handle )