sql server数据库占用cpu太大，使用sys.dm_exec_query_stats查询优化

查询sql语句占用 CPU详细信息：

SELECT (SELECT TOP 1 SUBSTRING(s2.text,statement_start_offset / 2+1 ,
( (CASE WHEN statement_end_offset = -1
THEN (LEN(CONVERT(nvarchar(max),s2.text)) * 2)
ELSE statement_end_offset END) - statement_start_offset) / 2+1)) AS sql_statement,
execution_count, plan_generation_num, creation_time, last_execution_time, total_worker_time, last_worker_time, min_worker_time,
max_worker_time, total_physical_reads, last_physical_reads,
min_physical_reads, max_physical_reads, total_logical_writes, last_logical_writes, min_logical_writes, max_logical_writes
FROM sys.dm_exec_query_stats AS s1
CROSS APPLY sys.dm_exec_sql_text(sql_handle) AS s2
WHERE s2.objectid is null --and sql_statement like 'UPDATE PT_ChildSysAlarms%'
ORDER BY s1.total_worker_time desc

sys.dm_exec_query_stats详细参数描述信息请参考：https://msdn.microsoft.com/zh-cn/library/ms189741(v=sql.110).aspx