クエリが本当に遅いという問題があります。私は MSSQL サーバー 2008 を使用しており、数百のサンプル データを含む 3 つの DB があります。クエリは、名前と値、および 3 つの DB に基づいて計算されたパーセンテージを返します。しかし、私が持っているクエリは、実行に約 10 分かかります。これは本当に時間がかかります。私はまだSQLを学んでいますが、まだそれほど良くないので、私が持っているクエリはベストプラクティスを使用しておらず、整理されていないと思います. どこで、またはどのようにクエリを改善してより高速に実行できるかを教えてもらえますか?
SELECT data.Ret,
case
when @group_by= 'site' OR (@group_by='attribute' AND @attribute_id = '5') and (data.rowid % 50) = 0 then (data.rowid / 50)-1
when @group_by= 'site' OR (@group_by='attribute' AND @attribute_id = '5') then (data.rowid / 50)
else 0 end as batchStore
,data.MajorName,data.MinorName,data.MajorVal,data.MinorVal,data.Version
,data.A_Percent,data.T_Percent,data.F_Percent
from
(
SELECT report.Ret,
CASE when @group_by= 'site' OR (@group_by='attribute' AND @attribute_id = '5')
then row_number() over (PARTITION BY report.Ret,report.Version order by report.Ret, report.MajorName)
else 0 end as rowid
,report.MajorName,report.MinorName,report.MajorVal,report.MinorVal,report.Version
,report.GTotal_A,report.GTotal_T,report.GTotal_F
,ISNULL(sum(report.Abn) / NULLIF(cast(report.GTotal_A as decimal),0),0) * 100 as A_Percent
,ISNULL(sum(report.Trn) / NULLIF(cast(report.GTotal_T as decimal),0),0) * 100 as T_Percent
,ISNULL(sum(report.Fld)/ NULLIF(cast(report.GTotal_F as decimal),0) * 100,0) as F_Percent
From
(
Select
CASE @group_by
WHEN 'object' THEN csl.s_name
WHEN 'site' THEN csl.s_name
WHEN 'year' THEN CAST(YEAR(dy.Day_Stamp) AS VARCHAR(50))
WHEN 'attribute' THEN CAST(coalesce(attrib.AttributeName,'') AS VARCHAR(50))
ELSE ''
END as MajorName,
CASE @group_by
WHEN 'object' THEN l.l_name
WHEN 'site' THEN ''
WHEN 'attribute' THEN CAST(coalesce(attrib.AttributeName,'') AS VARCHAR(50))
ELSE ''
END as MinorName,
CASE @group_by
WHEN 'object' THEN csl.s_name
WHEN 'site' THEN csl.s_name
WHEN 'year' THEN CAST(YEAR(dy.Day_Stamp) AS VARCHAR(50))
WHEN 'attribute' THEN CAST(coalesce(attrib.AttributeValue,'') AS VARCHAR(50))
ELSE ''
END as MajorVal,
CASE @group_by
WHEN 'object' THEN l.l_name
WHEN 'site' THEN ''
WHEN 'attribute' THEN CAST(coalesce(attrib.AttributeValue,'') AS VARCHAR(50))
ELSE ''
END as MinorVal,
csl.Cust_Name as Ret,l.SWVersion as Version
,d.Abn,d.Trn,d.Fld,data.GTotal_A ,data.GTotal_T,data.GTotal_F
From db_mon.dbo.CustSL csl
join db_tax.dbo.vwLane l
on (l.externalid = csl.custsl_id)
join db_mon.dbo.DaySummary dy
on (dy.Str = csl.s_name and dy.Lne = csl.l_name and year(dy.day_stamp) = year(@time_start_date) and year(dy.day_stamp) =year(@time_end_date))
Left Outer Join
(
Select a.id As AttributeId, a.attribute_name As AttributeName,
(Case When a.attribute_value_type = 'string' Then ea.string_value
Else (Case When a.attribute_value_type = 'integer' Then cast(ea.integer_value as nvarchar(100))
Else (Case When a.attribute_value_type = 'date' Then cast(ea.date_value as nvarchar(100))
Else (Case When a.attribute_value_type = 'boolean' Then cast(ea.boolean_value as nvarchar(100))
Else (Case When a.attribute_value_type = 'entity' Then cast(ea.ref_entity_id as nvarchar(100)) Else null End)
End)
End)
End)
End) As AttributeValue,
e.id As EntityId
From db_tax.dbo.entity_type et
Inner Join db_tax.dbo.entity As e on et.id = e.entity_type_id
Inner Join db_tax.dbo.entity_attribute As ea on e.id = ea.entity_id
Inner Join db_tax.dbo.attribute As a on ea.attribute_id = a.id
WHERE et.entity_type_name in ('Sticker','Label') And
a.id = (case WHEN @attribute_id = '' then 1 else cast(@attribute_id as int) end)
) AS attrib
On attrib.EntityId = l.L_Id
inner join db_mon.dbo.DaySummary d
on (csl.Cust_Name = d.Ret and csl.s_name = d.stckr and csl.l_name = d.label and l.SWVersion = d.Version)
join (
SELECT Ret,version,sum(Abn) as GTotal_A,sum(Trn) as GTotal_T,sum(Fld) as GTotal_F
from db_mon.dbo.DaySummary
where day_stamp >= @time_start_date and day_stamp <=@time_end_date
GROUP BY Ret,version
) data
on (d.Ret = data.Ret and l.SWVersion = data.Version)
WHERE (CHARINDEX(',' + CONVERT(VARCHAR,l.S_Id) + ',','xxx,' + @entities + ',xxx')>0 OR CHARINDEX(',' + CONVERT(VARCHAR,l.L_Id) + ',','xxx,' + @entities + ',xxx')>0)
and d.day_stamp >= @time_start_date
and d.day_stamp <=@time_end_date
) As report
Group By report.Ret,report.Version,report.MajorName,report.MinorName,report.MajorVal,report.MinorVal
,report.GTotal_A,report.GTotal_T,report.GTotal_F
)data
order By data.Ret,data.Version,batchStore,data.MajorName,data.MinorName,data.MajorVal,data.MinorVal
多くの結合を使用すると実行が遅くなりますか?