根据通过Stack Overflow的这篇帖子获得的非常有用的SQL语句获取查询执行统计信息:
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
我应该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导致例程被调用的次数异常地多,从而使真实使用水平失效。
SQL Server 2012
上,我刚刚使用了DBCC FREEPROCCACHE
。为什么我们还应该清除buffer
呢? - gotqn