-1

次のクエリを実行しています。

約 68000 レコードを返すのに 5 分かかります。しかし、クエリから LKP_PrivateSource (つまり、最後の左結合) を削除すると、68000 レコードを返すのに 1 秒かかります。BTY、LKP_PrivateSource テーブルにレコードがありません。問題の原因について何か考えはありますか?

Select
Case IsNull(LNK.StockID,0)
    When 0 Then AE.StockID
    Else LNK.StockID
End StockID,
IsNull(AE.LinkID,0) LinkID,IsNull(LNK.CapitalID,0) CapitalID,DE.SourceName
,AE.SourceDate 'Date'
,IsNull(AE.Formula,'') Formula
From AE_RevenuData AE
Left Join Linking LNK With(NoLock) ON LNK.LinkID=AE.LinkID
Inner Join DE_DataEntities DE ON DE.EntityID=AE.EntityID
Inner Join DataEntityIDs TE ON TE.EntityID=DE.EntityID
Inner Join STG_LockedEntityData STG ON STG.StockID=IsNull(LNK.StockID,AE.StockID) AND STG.CapitalID=IsNull(LNK.CapitalID,0) 
Left Join LKP_PrivateSource PS ON IsNull(PS.PSourceId,0)=IsNull(AE.PSourceID,0)
Where AE.ProjectID IN (13)
AND AE.LinkID IS NOT NULL

以下のプランをご覧ください。

  |--Compute Scalar(DEFINE:([Expr1017]=CASE WHEN [Expr1026]=(0) THEN [MYDBNAME].[dbo].[AE_RevenueData].[StockID] as [AE].[StockID] ELSE [MYDBNAME].[dbo].[INV_InvestorFundLinking].[StockID] as [LNK].[StockID] END))
   |--Nested Loops(Left Outer Join, OUTER REFERENCES:([Expr1027]))
        |--Filter(WHERE:([MYDBNAME].[dbo].[STG_LockedEntityData].[StockID] as [STG].[StockID]=isnull([MYDBNAME].[dbo].[INV_InvestorFundLinking].[StockID] as [LNK].[StockID],[MYDBNAME].[dbo].[AE_RevenueData].[StockID] as [AE].[StockID]) AND [MYDBNAME].[dbo].[STG_LockedEntityData].[CapitalID] as [STG].[CapitalID]=[Expr1019]))
        |    |--Compute Scalar(DEFINE:([Expr1019]=isnull([MYDBNAME].[dbo].[INV_InvestorFundLinking].[CapitalID] as [LNK].[CapitalID],(0)), [Expr1026]=isnull([MYDBNAME].[dbo].[INV_InvestorFundLinking].[StockID] as [LNK].[StockID],(0))))
        |         |--Nested Loops(Left Outer Join, OUTER REFERENCES:([AE].[LinkID]))
        |              |--Nested Loops(Inner Join, WHERE:([MYDBNAME].[dbo].[AE_RevenueData].[LinkID] as [AE].[LinkID]=[MYDBNAME].[dbo].[STG_LockedEntityData].[LinkID] as [STG].[LinkID]))
        |              |    |--Sort(ORDER BY:([Expr1027] ASC))
        |              |    |    |--Hash Match(Inner Join, HASH:([TE].[EntityID])=([AE].[EntityID]))
        |              |    |         |--Nested Loops(Inner Join, OUTER REFERENCES:([Uniq1008], [DE].[ListingID]))
        |              |    |         |    |--Nested Loops(Inner Join, OUTER REFERENCES:([TE].[EntityID]))
        |              |    |         |    |    |--Table Scan(OBJECT:([MYDBNAME].[dbo].[DataEntityIDs] AS [TE]))
        |              |    |         |    |    |--Index Seek(OBJECT:([MYDBNAME].[dbo].[DE_DataEntities].[PK_DE_DataSources] AS [DE]), SEEK:([DE].[EntityID]=[MYDBNAME].[dbo].[DataEntityIDs].[EntityID] as [TE].[EntityID]) ORDERED FORWARD)
        |              |    |         |    |--Clustered Index Seek(OBJECT:([MYDBNAME].[dbo].[DE_DataEntities].[IX_DE_DataSources] AS [DE]), SEEK:([DE].[ListingID]=[MYDBNAME].[dbo].[DE_DataEntities].[ListingID] as [DE].[ListingID] AND [Uniq1008]=[Uniq1008]) LOOKUP ORDERED FORWARD)
        |              |    |         |--Compute Scalar(DEFINE:([Expr1018]=[MYDBNAME].[dbo].[AE_RevenueData].[LinkID] as [AE].[LinkID], [Expr1020]=isnull([MYDBNAME].[dbo].[AE_RevenueData].[Formula] as [AE].[Formula],''), [Expr1021]=CONVERT(bit,[MYDBNAME].[dbo].[AE_RevenueData].[IsSumOfFunds] as [AE].[IsSumOfFunds],0), [Expr1022]=isnull([MYDBNAME].[dbo].[AE_RevenueData].[ClientSpecificSource] as [AE].[ClientSpecificSource],N''), [Expr1023]=isnull([MYDBNAME].[dbo].[AE_RevenueData].[GenericSource] as [AE].[GenericSource],N''), [Expr1027]=isnull([MYDBNAME].[dbo].[AE_RevenueData].[PSourceID] as [AE].[PSourceID],(0))))
        |              |    |              |--Clustered Index Seek(OBJECT:([MYDBNAME].[dbo].[AE_RevenueData].[IX_AE_RevenueData] AS [AE]), SEEK:([AE].[ProjectID]=(13)),  WHERE:([MYDBNAME].[dbo].[AE_RevenueData].[LinkID] as [AE].[LinkID] IS NOT NULL) ORDERED FORWARD)
        |              |    |--Table Scan(OBJECT:([MYDBNAME].[dbo].[STG_LockedEntityData] AS [STG]))
        |              |--Index Seek(OBJECT:([MYDBNAME].[dbo].[INV_InvestorFundLinking].[PK_Linking_1] AS [LNK]), SEEK:([LNK].[LinkID]=[MYDBNAME].[dbo].[AE_RevenueData].[LinkID] as [AE].[LinkID]) ORDERED FORWARD)
        |--Clustered Index Seek(OBJECT:([MYDBNAME].[dbo].[LKP_PrivateSource].[PK_LKP_FactsetSource] AS [PS]), SEEK:([PS].[PSourceID]=[Expr1027]) ORDERED FORWARD)
4

1 に答える 1

0

左結合で比較の両側に関数を使用しているという事実だと思います。

それを修正する方法はビジネス ロジックに大きく依存しますが、そのテーブルで 2 つ以上の左結合を行うことを検討します。

1 つは単純な値と値の比較を行うもので、もう 1 つは null 値のロジックのみを処理するものです。

それらが要件にどのように適合するかによって順序付けられた合体にそれらを追加する必要があります。

于 2012-06-08T13:11:33.047 に答える