如何在SQL Server 2005/2008中清除查询执行统计信息

Question

基于使用从这篇文章获得的这个非常有用的SQL获取查询执行统计信息最常执行的存储过程 - 堆栈溢出 ：

SELECT TOP 100
   qt.TEXT AS 'SP Name',
   SUBSTRING(qt.text, qs.statement_start_offset/2, CASE WHEN (qs.statement_end_offset = -1) THEN LEN(qt.text) ELSE (qs.statement_end_offset - qs.statement_start_offset)/2 END) AS actual_query,
   qs.execution_count AS 'Execution Count',
   qs.total_worker_time/qs.execution_count AS 'AvgWorkerTime',
   qs.total_worker_time AS 'TotalWorkerTime',
   qs.total_physical_reads AS 'PhysicalReads',
   qs.creation_time 'CreationTime',
   qs.execution_count/DATEDIFF(Second, qs.creation_time, GETDATE()) AS 'Calls/Second'
FROM sys.dm_exec_query_stats AS qs
CROSS APPLY sys.dm_exec_sql_text(qs.sql_handle) AS qt
WHERE qt.dbid = (SELECT dbid
                FROM sys.sysdatabases
               WHERE name = 'BSP')
ORDER BY qs.total_worker_time/qs.execution_count DESC

我如何完全清除这些执行统计信息并从头开始？

这将特别有用，因为开发错误和测试已经导致例程被调用通常很多次，从而无视真实的使用级别。

Answer 1

DBCC FREEPROCCACHE
DBCC DROPCLEANBUFFERS