笔记288 排查CPU占用高的情况 2013-6-12

笔记288 排查CPU占用高的情况 2013-6-12

--排查CPU占用高的情况 2013-6-12
USE master
GO
--如果要指定数据库就把注释去掉
SELECT * 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 '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](der.[sql_handle]) AS dest
WHERE [session_id]>50 AND DB_NAME(der.[database_id])='gposdb' 
ORDER BY [cpu_time] DESC

-----------------------------------------------------------------------------------
--在SSMS里选择以文本格式显示结果
SELECT TOP 10
dest.[text] AS 'sql语句'
FROM sys.[dm_exec_requests] AS der
CROSS APPLY
sys.[dm_exec_sql_text](der.[sql_handle]) AS dest
WHERE [session_id]>50 
ORDER BY [cpu_time] DESC

---------------------------------------------------------------------------
--查看CPU数和user scheduler数和最大工作线程数，检查worker是否用完

--查看CPU数和user scheduler数目
SELECT cpu_count,scheduler_count FROM sys.dm_os_sys_info
--查看最大工作线程数
SELECT max_workers_count FROM sys.dm_os_sys_info


--查看机器上的所有schedulers包括user 和system
--通过下面语句可以看到worker是否用完，当达到最大线程数的时候就要检查blocking了
--对照下面这个表
--各种CPU和SQLSERVER版本组合自动配置的最大工作线程数
--CPU数                 32位计算机                        64位计算机
--<=4                    256                               512
--8                       288                              576
--16                      352                              704
--32                      480                              960
SELECT
scheduler_address,
scheduler_id,
cpu_id,
status,
current_tasks_count,
current_workers_count,active_workers_count
FROM sys.dm_os_schedulers