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原标题:Query benchmarking

Preamble

I have a hypothesis about the performance difference between using the native SQL aggregate functions and the aggregates supplied in SSIS (database will crush SSIS). I d like to develop an empirical process for testing that.

在初步测试方面,我的唯一关切是执行速度。 以后的频率将用于支付剪辑和记忆费。

为了做到这一点,我编制了一个小表(100M浏览器),希望抓住时间上的差别。 我计划在信息社会首脑会议一揽子计划范围内,比较关于紧急状况和紧急状况的时机。

第一个数据流将采用<代码>的形式。 缩略语*

SSIS Aggregate vs Database Aggregate

类似问题,但并非我所期待的问题。

tl;dr;

如果我这样的话,使评价尽可能好。

  • flush the cache between steps
  • warm the cache by executing the queries beforehand
  • something else

如果决定是流利,则dbcc freeproccache>a> 足够或确实需要>>>。

问题回答

我认为,你真的想要在行程之间清除一页的藏匿点。

如果是我的话,我就这样说:

DBCC FREEPROCCACHE
CHECKPOINT
DBCC DROPCLEANBUFFERS

<代码>FREEPROCCACHE仅明确了该计划的切身之处,与数据页毫无关系。

<代码>CHECKPOINT将冲上所有 d脏网页。

我还愿审议<代码>。 SET STATISTICS IO ON and SET_STATISTICS TPAS ON for anyî in SSMS.





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