性能优化系列---查询高cup的sql

SELECT TOP 10 [Average CPU used] = total_worker_time / qs.execution_count,
[Total CPU used] = total_worker_time,
[Execution count] = qs.execution_count,
[Individual Query] = SUBSTRING (qt.text,qs.statement_start_offset/2,       
(CASE WHEN qs.statement_end_offset = -1 THEN LEN(CONVERT(NVARCHAR(MAX), qt.text)) * 2   ELSE qs.statement_end_offset END -qs.statement_start_offset)/2),
[Parent Query] = qt.text,DatabaseName = DB_NAME(qt.dbid)
FROM sys.dm_exec_query_stats qs CROSS APPLY sys.dm_exec_sql_text(qs.sql_handle) as qt ORDER BY [Average CPU used] DESC;