数据库优化

查询最消耗CPU的前10条Sql 

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])='数据名称'  

 ORDER BY [cpu_time] DESC