SQL Server中查询CPU占用高的SQL语句

SQL Server中查询CPU占用高的SQL语句

SQL Server中查询CPU占用高的情况,会用到sys.sysprocesses ,dm_exec_sessions ,dm_exec_requests

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

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  • SQL 代码   复制
  • 
    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
    
    		
  • 三、查询前10个最耗CPU时间的SQL语句

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  • SQL 代码   复制
  • 
    --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
    
    		
  • 四、查询会话中有多少个worker在等待 

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  • SQL 代码   复制
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    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](der.[sql_handle]) AS dest 
    
     WHERE [session_id]>50  
    
     ORDER BY [cpu_time] DESC
    
    		
  • 五、查询CPU占用高的语句

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  • SQL 代码   复制
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    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
    
    		
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