妈的服务器老是经常半夜CPU过高报警,得查下
参考资料
https://www.modb.pro/db/210369
https://www.cnblogs.com/zhaoshujie/p/9594719.html
查询占用CPU过高进程
SELECT r.session_id, r.start_time, r.status, r.command, r.cpu_time, s.text
FROM sys.dm_exec_requests r
CROSS APPLY sys.dm_exec_sql_text(r.sql_handle) s
WHERE r.cpu_time > 0
ORDER BY r.cpu_time DESC;
查询占用CPU高的语句
SELECT TOP 10 TEXT AS 'SQL Statement'
,last_execution_time AS 'Last Execution Time'
,(total_logical_reads + total_physical_reads + total_logical_writes) / execution_count AS [Average IO]
,(total_worker_time / execution_count) / 1000000.0 AS [Average CPU Time (sec)]
,(total_elapsed_time / execution_count) / 1000000.0 AS [Average Elapsed Time (sec)]
,execution_count AS "Execution Count",qs.total_physical_reads,qs.total_logical_writes
,qp.query_plan AS "Query Plan"
FROM sys.dm_exec_query_stats qs
CROSS APPLY sys.dm_exec_sql_text(qs.plan_handle) st
CROSS APPLY sys.dm_exec_query_plan(qs.plan_handle) qp
ORDER BY total_elapsed_time / execution_count DESC
查找最新的30条告警事件
select top 30 a.orderno,a.AgentBm,a.AlarmTime,a.RemoveTime,c.Name as AddrName,b.Name as MgrObjName,a.Ch,a.Value,a.Content,a.Level
,ag.Name as AgentServerName,a.EventBm,a.MgrObjId,a.Id,a.Cfmoper,a.Cfm,a.Cfmtime,a.State,a.IgnoreStartTime,a.IgnoreEndTime
,a.OpUserId,d.Name as MgrObjTypeName,l.UserName as userName,f.Name as AddrName2
from eventlog as a left join mgrobj as b on a.MgrObjId=b.Id and a.AgentBm=b.AgentBm
left join addrnode as c on b.AddrId=c.Id left join mgrobjtype as d on b.MgrObjTypeId=d.Id
left join eventdir as e on a.EventBm=e.Bm left join agentserver as ag on a.AgentBm=ag.AgentBm
left join loginUser as l on a.cfmoper=l.loginGuid left join addrnode as f on ag.AddrId=f.Id
where ((MgrObjId in (
select Id from MgrObj
where AddrId in ('','02100000','02113000','02113001','02113002','02113003','02113004'
,'02113005','02113006','02113007','02113008','02113009','02113010','02113011','02113012'
,'02113013','02113014','02113015','02113016','02113017','02113018','02113019','02113020'
,'02113021','02113022','02113023','02113024','02113025','02113026')))
or (mgrobjid in ('00000000-0000-0000-0000-000000000000','00000000-0000-0000-0000-000000000000'
,'00000000-0000-0000-0000-000000000000','11111111-1111-1111-1111-111111111111'
,'11111111-1111-1111-1111-111111111111'))
)
order by alarmtime DESC
一、查看当前的数据库用户连接有多少
USE master
GO
SELECT *
FROM sys.[sysprocesses]
WHERE [spid] > 50
–AND DB_NAME([dbid])=’gposdb’
SELECT COUNT(*)
FROM [sys].[dm_exec_sessions]
WHERE [session_id] > 50
二、选取前10个最耗CPU时间的会话
SELECT TOP 10
[session_id] ,
[request_id] ,
[start_time] AS ‘开始时间’ ,
[status] AS ‘状态’ ,
[command] AS ‘命令’ ,
dest.[text] AS ‘sql语句’ ,
DB_NAME([database_id]) AS ‘数据库名’ ,
[blocking_session_id] AS ‘正在阻塞其他会话的会话ID’ ,
[wait_type] AS ‘等待资源类型’ ,
[wait_time] AS ‘等待时间’ ,
[wait_resource] AS ‘等待的资源’ ,
[reads] AS ‘物理读次数’ ,
[writes] AS ‘写次数’ ,
[logical_reads] AS ‘逻辑读次数’ ,
[row_count] AS ‘返回结果行数’
FROM sys.[dm_exec_requests] AS der
CROSS APPLY sys.dm_exec_sql_text AS dest
WHERE [session_id] > 50
AND DB_NAME(der.[database_id]) = ‘gposdb’
ORDER BY [cpu_time] DESC
三、查询前10个最耗CPU时间的SQL语句
SELECT TOP 10
dest.[text] AS ‘sql语句’
FROM sys.[dm_exec_requests] AS der
CROSS APPLY sys.dm_exec_sql_text AS dest
WHERE [session_id] > 50
ORDER BY [cpu_time] DESC
四、查询会话中有多少个worker在等待
SELECT TOP 10
[session_id] ,
[request_id] ,
[start_time] AS ‘开始时间’ ,
[status] AS ‘状态’ ,
[command] AS ‘命令’ ,
dest.[text] AS ‘sql语句’ ,
DB_NAME([database_id]) AS ‘数据库名’ ,
[blocking_session_id] AS ‘正在阻塞其他会话的会话ID’ ,
der.[wait_type] AS ‘等待资源类型’ ,
[wait_time] AS ‘等待时间’ ,
[wait_resource] AS ‘等待的资源’ ,
[dows].[waiting_tasks_count] AS ‘当前正在进行等待的任务数’ ,
[reads] AS ‘物理读次数’ ,
[writes] AS ‘写次数’ ,
[logical_reads] AS ‘逻辑读次数’ ,
[row_count] AS ‘返回结果行数’
FROM sys.[dm_exec_requests] AS der
INNER JOIN [sys].[dm_os_wait_stats] AS dows ON der.[wait_type] = [dows].[wait_type]
CROSS APPLY sys.dm_exec_sql_text AS dest
WHERE [session_id] > 50
ORDER BY [cpu_time] DESC
五、查询CPU占用高的语句
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
1.找出执行时间最长的10条SQL(适用于SQL SERVER 2005及其以上版本)
SELECT
(total_elapsed_time / execution_count)/1000 N'平均时间ms'
,total_elapsed_time/1000 N'总花费时间ms'
,total_worker_time/1000 N'所用的CPU总时间ms'
,total_physical_reads N'物理读取总次数'
,total_logical_reads/execution_count N'每次逻辑读次数'
,total_logical_reads N'逻辑读取总次数'
,total_logical_writes N'逻辑写入总次数'
,execution_count N'执行次数'
,SUBSTRING(st.text, (qs.statement_start_offset/2) + 1
,((CASE statement_end_offset
WHEN -1 THEN DATALENGTH(st.text)
ELSE qs.statement_end_offset END
- qs.statement_start_offset)/2) + 1) N'执行语句'
,creation_time N'语句编译时间'
,last_execution_time N'上次执行时间'
,qp.query_plan
FROM
sys.dm_exec_query_stats AS qs
CROSS APPLY sys.dm_exec_sql_text(qs.sql_handle) st
CROSS APPLY sys.dm_exec_query_plan(qs.plan_handle) qp
WHERESUBSTRING(st.text, (qs.statement_start_offset/2) + 1,
((CASE statement_end_offsetWHEN -1 THEN DATALENGTH(st.text)ELSE qs.statement_end_offset END- qs.statement_start_offset)/2) + 1) not like 'fetch%'ORDER BY
total_elapsed_time / execution_count DESC;
如果想对SQL作筛选,可以更换not like ‘%fetch%’ 部分,如将not like ‘%fetch%’ 换成 like ‘%user%’就可以找出SQL语句中含有user关键字的SQL 。
2.找出平均消耗CPU最多的前个SQL (SQL SERVER 2005或以上版本)
SELECT TOP 5 total_worker_time / execution_count AS [Avg CPU Time],
SUBSTRING(st.text, (qs.statement_start_offset/2)+1,
((CASE qs.statement_end_offset
WHEN -1 THEN DATALENGTH(st.text)
ELSE qs.statement_end_offset
END - qs.statement_start_offset)/2) + 1) AS statement_text
FROM sys.dm_exec_query_stats AS qs
CROSS APPLY sys.dm_exec_sql_text(qs.sql_handle) AS st
ORDER BY total_worker_time/execution_count DESC
3.平均耗CPU最多的前20个SQL (SQL SERVER 2008或以上版本)
SELECT TOP 20
total_worker_time/1000 AS [总消耗CPU 时间(ms)],
execution_count [运行次数],
qs.total_worker_time/qs.execution_count/1000 AS [平均消耗CPU 时间(ms)],
last_execution_time AS [最后一次执行时间],
min_worker_time /1000 AS [最小执行时间(ms)],
max_worker_time /1000 AS [最大执行时间(ms)],
SUBSTRING(qt.text,qs.statement_start_offset/2+1,
(CASE WHEN qs.statement_end_offset = -1
THEN DATALENGTH(qt.text)
ELSE qs.statement_end_offset END -qs.statement_start_offset)/2 + 1)
AS [使用CPU的语法], qt.text [完整语法],
qt.dbid, dbname=db_name(qt.dbid),
qt.objectid,object_name(qt.objectid,qt.dbid) ObjectName
FROM sys.dm_exec_query_stats qs WITH(nolock)
CROSS apply sys.dm_exec_sql_text(qs.sql_handle) AS qt
WHERE execution_count>1
ORDER BY (qs.total_worker_time/qs.execution_count/1000) DESC
4.总耗CPU最多的前20个SQL (SQL SERVER 2008或以上版本)
SELECT TOP 20
total_worker_time/1000 AS [总消耗CPU 时间(ms)],execution_count [运行次数],
qs.total_worker_time/qs.execution_count/1000 AS [平均消耗CPU 时间(ms)],
last_execution_time AS [最后一次执行时间],min_worker_time /1000 AS [最小执行时间(ms)],max_worker_time /1000 AS [最大执行时间(ms)],
SUBSTRING(qt.text,qs.statement_start_offset/2+1,
(CASE WHEN qs.statement_end_offset = -1
THEN DATALENGTH(qt.text)
ELSE qs.statement_end_offset END -qs.statement_start_offset)/2 + 1)
AS [使用CPU的语法], qt.text [完整语法],
qt.dbid, dbname=db_name(qt.dbid),
qt.objectid,object_name(qt.objectid,qt.dbid) ObjectName
FROM sys.dm_exec_query_stats qs WITH(nolock)
CROSS apply sys.dm_exec_sql_text(qs.sql_handle) AS qt
WHERE execution_count>1
ORDER BY total_worker_time DESC
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