更新：事实上留下下面复杂的查询，请检查这个查询。它说 Fetch 是 98% 而 Row_Number 是 2%？
Fetch 是 sql server 2012 的另一个营销关键字吗？
-------------------------原来的问题--------
让我明确一点，无论我在哪里阅读，我都发现 Fetch 比旧的 Row_Number 函数快得多。然而，我发现它几乎相反，而且还有很长的路要走。我的数据库有近 20 万条记录。这是我使用 Fetch 的查询：
exec sp_executesql N'set arithabort off;set transaction isolation level read uncommitted;
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,ig.Abbreviation as IGroupAbbreviation, u.Username, j.JDAbbreviation, inf.DocumentName,
it.Abbreviation, 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
FROM Documents cte Left Join DocumentStatuses ds On
cte.DocumentStatusID = ds.DocumentStatusID
Inner Join Users u on cte.UserID = u.UserID
Inner Join IGroupes ig On ig.IGroupID = cte.IGroupID
Inner Join ITypes it On ig.IGroupID = it.IGroupID
Left Join InstrumentFiles inf On cte.DocumentID = inf.DocumentID
Left Join Jurisdictions j on j.JurisdictionID = cte.JurisdictionID Where 1=1
Order by cte.LastStatusChangedDateTime OFFSET 110700 Rows FETCH Next 50 Rows ONLY',N'@0 int,@1 int,@2 int,@3 int,@4 int,@5 int,@6 int,@7 int,@8 int,@9 int,@10 int,@11 int',
@0=4,@1=1,@2=5,@3=9,@4=4,@5=1,@6=1,@7=5,@8=9,@9=4,@10=1,@11=1
上面的查询需要 17 秒才能产生 50 条记录。这是查询计划：
这是查询计划 XML，以防图像中不清楚： https ://www.dropbox.com/s/br5urj4xapazu9l/fetch.txt
现在这是使用旧 Row_Number 的相同查询（并使用相同的数据库索引和列以及连接作为 Fetch）：
exec sp_executesql N'set arithabort off;set transaction isolation level read uncommitted;With cte as (Select peta_rn = ROW_NUMBER() OVER (ORDER BY d.LastStatusChangedDateTime asc )
, d.DocumentID
, u.Username
, it.Abbreviation AS ITypeAbbreviation
, ig.Abbreviation AS IGroupAbbreviation
, d.IsReEfiled
, d.IGroupID
, d.ITypeID
, d.RecordingDateTime
, d.CreatedByAccountID
, d.JurisdictionID
, d.LastStatusChangedDateTime AS LastStatusChangedDateTime
, d.IDate
, d.InstrumentID
, d.DocumentStatusID
, d.DocumentDate
From Documents d
Inner Join Users u on d.UserID = u.UserID Inner Join IGroupes ig on ig.IGroupID = d.IGroupID
Inner Join ITypes it on it.ITypeID = d.ITypeID Where 1=1 ANd d.IGroupID = @0 And (d.JurisdictionID = @1 Or DocumentStatusID = @2 Or DocumentStatusID = @3
Or DocumentStatusID = @4 Or DocumentStatusID = @5) And d.DocumentStatusID <> 3 And d.DocumentStatusID <> 8 And d.DocumentStatusID <> 7 AND
((CreatedByJurisdictionID = @6 Or DocumentStatusID = @7 Or DocumentStatusID = @8
Or DocumentStatusID = @9 Or DocumentStatusID = @10
Or CreatedByAccountID IN (Select AccountID From AccountsJurisdictions Where JurisdictionID = @11)))) 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
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>@12 AND peta_rn<=@13 Order by peta_rn',N'@0 int,@1 int,@2 int,@3 int,@4 int,@5 int,@6 int,@7 int,@8 int,@9 int,@10 int,@11 int,@12 int,@13 int',@0=4,@1=1,@2=5,@3=9,@4=4,@5=1,@6=1,@7=5,@8=9,@9=4,@10=1,@11=1,@12=110700,@13=110750
此查询耗时不到 1 秒！这是查询计划：
那么，我错过了什么？为什么 row_number 比 Fetch 快？
这是rownum的查询计划： https ://www.dropbox.com/s/uin66esfb2ov8m7/rownum.txt