これは私のクエリです：
exec sp_executesql N'set arithabort off;set statistics time on; set transaction isolation level read uncommitted;With cte as (Select peta_rn = ROW_NUMBER() OVER (ORDER BY d.LastStatusChangedDateTime desc )
, d.DocumentID,
d.IsReEfiled, d.IGroupID, d.ITypeID, d.RecordingDateTime, d.CreatedByAccountID, d.JurisdictionID,
d.LastStatusChangedDateTime as LastStatusChangedDateTime
, d.IDate, d.InstrumentID, d.DocumentStatusID
, u.Username
, it.Abbreviation AS ITypeAbbreviation
, ig.Abbreviation AS IGroupAbbreviation,
d.DocumentDate
From Documents d
Inner Join ITypes it on it.ITypeID = d.ITypeID
Inner Join Users u on d.UserID = u.UserID Inner Join IGroupes ig on ig.IGroupID = d.IGroupID
Where 1=1 And ( d.DocumentStatusID = 9 ) ) Select cte.DocumentID,
cte.IsReEfiled, cte.IGroupID, cte.ITypeID, cte.RecordingDateTime, cte.CreatedByAccountID, cte.JurisdictionID,
cte.LastStatusChangedDateTime as LastStatusChangedDateTime
, cte.IDate, cte.InstrumentID, cte.DocumentStatusID,cte.IGroupAbbreviation, cte.Username, j.JDAbbreviation, inf.DocumentName,
cte.ITypeAbbreviation, cte.DocumentDate, ds.Abbreviation as DocumentStatusAbbreviation, ds.Name as DocumentStatusName,
( SELECT CAST(CASE WHEN cte.DocumentID = (
SELECT TOP 1 doc.DocumentID
FROM Documents doc
WHERE doc.JurisdictionID = cte.JurisdictionID
AND doc.DocumentStatusID = cte.DocumentStatusID
ORDER BY LastStatusChangedDateTime)
THEN 1
ELSE 0
END AS BIT)
) AS CanChangeStatus ,
Upper((Select Top 1 Stuff( (Select ''='' + dbo.GetDocumentNameFromParamsWithPartyType(Business, FirstName, MiddleName, LastName, t.Abbreviation, NameTypeID, pt.Abbreviation, IsGrantor, IsGrantee) From DocumentNames dn
Left Join Titles t
on dn.TitleID = t.TitleID
Left Join PartyTypes pt
On pt.PartyTypeID = dn.PartyTypeID
Where DocumentID = cte.DocumentID
For XML PATH('''')),1,1,''''))) as FlatDocumentName, (SELECT COUNT(*) FROM CTE) AS TotalRecords
FROM cte Left Join DocumentStatuses ds On
cte.DocumentStatusID = ds.DocumentStatusID Left Join InstrumentFiles inf On cte.DocumentID = inf.DocumentID
Left Join Jurisdictions j on j.JurisdictionID = cte.JurisdictionID Where 1=1 And
peta_rn>@7 AND peta_rn<=@8 Order by peta_rn set statistics time off; ',N'@0 int,@1 int,@2 int,@3 int,@4 int,@5 int,@6 int,@7 int,@8 int',
@0=1,@1=5,@2=9,@3=1,@4=5,@5=9,@6=1,@7=97500,@8=97550
そして、これは私の IGroupes テーブル定義です:
CREATE TABLE [dbo].[IGroupes](
[IGroupID] [int] IDENTITY(1,1) NOT NULL,
[Name] [varchar](64) NOT NULL,
[JurisdictionID] [int] NOT NULL,
[Abbreviation] [varchar](12) NOT NULL,
CONSTRAINT [PK_IGroupes] PRIMARY KEY NONCLUSTERED
(
[IGroupID] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON, FILLFACTOR = 90) ON [PRIMARY]
) ON [PRIMARY]
GO
SET ANSI_PADDING OFF
GO
SET ANSI_PADDING ON
GO
/****** Object: Index [IX_IGroupes_Abbreviation] Script Date: 10/11/2013 4:21:46 AM ******/
CREATE NONCLUSTERED INDEX [IX_IGroupes_Abbreviation] ON [dbo].[IGroupes]
(
[Abbreviation] ASC
)
INCLUDE ( [IGroupID],
[Name],
[JurisdictionID]) WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, SORT_IN_TEMPDB = OFF, DROP_EXISTING = OFF, ONLINE = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON, FILLFACTOR = 90) ON [PRIMARY]
GO
SET ANSI_PADDING ON
GO
/****** Object: Index [IX_IGroupes_JurisdictionID] Script Date: 10/11/2013 4:21:46 AM ******/
CREATE NONCLUSTERED INDEX [IX_IGroupes_JurisdictionID] ON [dbo].[IGroupes]
(
[JurisdictionID] ASC
)
INCLUDE ( [IGroupID],
[Name],
[Abbreviation]) WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, SORT_IN_TEMPDB = OFF, DROP_EXISTING = OFF, ONLINE = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON, FILLFACTOR = 90) ON [PRIMARY]
GO
SET ANSI_PADDING ON
GO
/****** Object: Index [IX_IGroupes_Name] Script Date: 10/11/2013 4:21:46 AM ******/
CREATE NONCLUSTERED INDEX [IX_IGroupes_Name] ON [dbo].[IGroupes]
(
[Name] ASC
)
INCLUDE ( [IGroupID],
[JurisdictionID],
[Abbreviation]) WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, SORT_IN_TEMPDB = OFF, DROP_EXISTING = OFF, ONLINE = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON, FILLFACTOR = 90) ON [PRIMARY]
GO
ただし、テーブルスキャンを使用していることを確認してください。この操作にはコストがかかりすぎます。IGroupesテーブルには 7 行しかなく、Documentsテーブルには約 98K のレコードがあります。しかし、参加するd.IGroupID = ig.IGroupIDと、実際の行数が 600K を超えています! それが問題だ。添付のスクリーンショットをご覧ください。
完全なクエリ プラン xml に興味がある場合は、次のとおりです。
https://www.dropbox.com/s/kldx24x3j8vndpe/plan.xml
どんな助けでも大歓迎です。ありがとう！