Top (参数)

最近在优化数据库服务器上高消耗语句/过程，发现一个存储过程优化后依旧出现在Profiler跟踪里。将Profiler跟踪文件中过程执行语句取出，打开一个查询窗口(SPID=144)，set statistics io on，同时开启Profiler跟踪SPID=144中的语句执行情况。
下面是在查询窗口的执行结果，逻辑读只有17：

--使用RML Cmd Prompt导入跟踪数据
ReadTrace -I"F:\TroubleShooting\Trace\HostName_InstanceName_HighCPU33_after.trc" -o"F:\TroubleShooting\Trace\output" -S"127.0.0.1,7777" -d"PerfAnalysis" -E

USE PerfAnalysis
GO
--查询跟踪
select MIN(StartTime),MAX(EndTime),COUNT(*)
from fn_trace_gettable(N'F:\TroubleShooting\Trace\HostName_InstanceName_HighCPU33_after.trc', default)
where cpu is not null

select * from ReadTrace.tblTimeIntervals
select top 10 * from ReadTrace.tblBatchPartialAggs
select top 10 * from ReadTrace.tblUniqueBatches

--最初是按HashID得到总消耗CPU、Duration、Reads、Writes前N的语句
--后期根据需求添加DBID、LoginNameID，还可以计算平均消耗
select *,
row_number() over(order by sum_CPU_ms desc) as QueryNumber
from (
select     --a.HashID,
sum(CompletedEvents) as Executes,
sum(TotalCPU) as sum_CPU_ms,
sum(TotalCPU)/sum(CompletedEvents) as avg_CPU_ms,--add
sum(TotalDuration)/1000 as sum_Duration_ms,
sum(TotalDuration)/(sum(CompletedEvents)*1000) as avg_Duration_ms,--add
sum(TotalReads) as sum_Reads,
sum(TotalReads)/sum(CompletedEvents) as avg_Reads,--add
sum(TotalWrites) as sum_Writes,
sum(TotalWrites)/sum(CompletedEvents) as avg_Writes,--add
--sum(AttentionEvents) as sum_Attentions,
--(select StartTime from ReadTrace.tblTimeIntervals i where TimeInterval = @StartTimeInterval) as [StartTime],
--(select EndTime from ReadTrace.tblTimeIntervals i where TimeInterval = @EndTimeInterval) as [EndTime],
--add DatabaseName、LoginName
(select distinct DatabaseName from fn_trace_gettable(N'F:\TroubleShooting\Trace\HostName_InstanceName_HighCPU33_after.trc', default) where DatabaseID=a.DBID) as DatabaseName,
(select LoginName from ReadTrace.tblUniqueLoginNames where iID=a.LoginNameID) as LoginName,
(select cast(NormText as nvarchar(4000)) from ReadTrace.tblUniqueBatches b where b.HashID = a.HashID) as [NormText],
row_number() over(order by sum(TotalCPU) desc) as CPUDesc,
row_number() over(order by sum(TotalCPU) asc) as CPUAsc,
row_number() over(order by sum(TotalDuration) desc) as DurationDesc,
row_number() over(order by sum(TotalDuration) asc) as DurationAsc,
row_number() over(order by sum(TotalReads) desc) as ReadsDesc,
row_number() over(order by sum(TotalReads) asc) as ReadsAsc,
row_number() over(order by sum(TotalWrites) desc) as WritesDesc,
row_number() over(order by sum(TotalWrites) asc) as WritesAsc
from ReadTrace.tblBatchPartialAggs a
--where TimeInterval @StartTimeInterval and @EndTimeInterval
--and a.AppNameID = isnull(@iAppNameID, a.AppNameID)
--and a.LoginNameID = isnull(@iLoginNameID, a.LoginNameID)
--and a.DBID = isnull(@iDBID, a.DBID)
group by a.HashID,a.DBID,a.LoginNameID
) as Outcome
where     (CPUDesc <= 20
--or CPUAsc <= @TopN
or DurationDesc <= 20
--or DurationAsc <= @TopN
or ReadsDesc <= 20
--or ReadsAsc <= @TopN
or WritesDesc <= 20
--or WritesAsc <= @TopN
)
order by sum_CPU_ms desc
option (recompile)

select top 100 EventClass,TextData,DatabaseName,DatabaseID,Duration/1000 Duration_ms,CPU CPU_ms,Reads,Writes,StartTime,EndTime,HostName,LoginName,ApplicationName
from fn_trace_gettable(N'F:\TroubleShooting\Trace\HostName_InstanceName_HighCPU33_after.trc', default)
where TextData like '%GAMEWEB_ADMIN_GAMESCORE_LOG%'

View Code
代码对应的是RML报表的Top Unique Batches页面，同时增加对数据库、应用程序分组，以及平均消耗值信息。部分组件导出到execl、word、pdf时报错，可以使用语句直接从数据库下提取消耗列表。