SQL Server中查詢CPU占用高的SQL語句

sql server中查詢cpu占用高的情況，會用到sys.sysprocesses ,dm_exec_sessions ,dm_exec_requests

一、檢視當前的資料庫使用者連線有多少

use master

goselect * from sys.[sysprocesses] where [spid]>50 --and db_name([dbid])='gposdb'
select count(*) from [sys].[dm_exec_sessions] where [session_id]>50

select top 10

[session_id],
[request_id],
[start_time] as '開始時間',
[status] as '狀態',
[command] as '命令',
dest.[text] as 'sql語句', 
db_name([database_id]) as '資料庫名',
[blocking_session_id] as '正在阻塞其他會話的會話id',
[wait_type] as '等待資源型別',
[wait_time] as '等待時間',
[wait_resource] as '等待的資源',
[reads] as '物理讀次數',
[writes] as '寫次數',
[logical_reads] as '邏輯讀次數',
[row_count] as '返回結果行數'
from sys.[dm_exec_requests] as der 
sys.[dm_exec_sql_text](der.[sql_handle]) as dest 
where [session_id]>50 and db_name(der.[database_id])='gposdb' 
order by [cpu_time] desc

select top 10 dest.[text] as 'sql語句'

from sys.[dm_exec_requests] as der 
sys.[dm_exec_sql_text](der.[sql_handle]) as dest 
where [session_id]>50 
order by [cpu_time] desc

select top 10

[session_id],
[request_id],
[start_time] as '開始時間',
[status] as '狀態',
[command] as '命令',
dest.[text] as 'sql語句', 
db_name([database_id]) as '資料庫名',
[blocking_session_id] as '正在阻塞其他會話的會話id',
der.[wait_type] as '等待資源型別',
[wait_time] as '等待時間',
[wait_resource] as '等待的資源',
[dows].[waiting_tasks_count] as '當前正在進行等待的任務數',
[reads] as '物理讀次數',
[writes] as '寫次數',
[logical_reads] as '邏輯讀次數',
[row_count] as '返回結果行數'
from sys.[dm_exec_requests] as der 
inner join [sys].[dm_os_wait_stats] as dows 
on der.[wait_type]=[dows].[wait_type]
sys.[dm_exec_sql_text](der.[sql_handle]) as dest 
where [session_id]>50 
order by [cpu_time] desc

select top 10

total_worker_time/execution_count as **g_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 [**g_cpu_cost] desc

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