Question

我们已将SQL Server跟踪加载到包含以下字段的表

StartTime，Duration，Object_name，DatabaseID，HostName，＆amp;应用程序名。

如何按小时，Object_name，DatabaseID，HostName和＆amp ;;计算平均持续时间分组的第95百分位数。应用名称？

谢谢。

Answer 1

您似乎知道问题的答案。它是这样的：

select avg(duration) as avg_duration,
       percentile_cont(0.95) within group (order by avg(duration)) over () as percentile_95
from t
group by hour, Object_name, DatabaseID, HostName, ApplicationName;

注意：这会将值放在每一行上。我倾向于使用以下单值：

select top (1) percentile_cont(0.95) within group (order by avg_duration) over () as percentile_95
from (select avg(duration) as avg_duration,
             percentile_cont(0.95) over (order by avg(duration)) as percentile_95
      from t
      group by hour, Object_name, DatabaseID, HostName, ApplicationName
     ) t;

使用PERCENTILE_CONT＆amp;计算第95个数据百分位数。 PERCENTILE_DISC

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