Question

我需要加快EF生成的SQL查询的速度。

SELECT TOP (10) 
    [Filter1].[ID1] AS [ID], 
    [Filter1].[TransactionDateTime] AS [TransactionDateTime], 
    [Filter1].[TransactionType] AS [TransactionType], 
    [Filter1].[OrganizationID] AS [OrganizationID], 
    [Filter1].[Amount] AS [Amount], 
    [Filter1].[Value] AS [Value], 
    [Filter1].[PackagingID] AS [PackagingID], 
    [Filter1].[PackagingTransaction_ID] AS [PackagingTransaction_ID]
FROM 
    (SELECT 
         [Extent1].[ID] AS [ID1], 
         [Extent1].[TransactionDateTime] AS [TransactionDateTime], 
         [Extent1].[TransactionType] AS [TransactionType], 
         [Extent1].[PackagingID] AS [PackagingID], 
         [Extent1].[OrganizationID] AS [OrganizationID], 
         [Extent1].[Amount] AS [Amount], 
         [Extent1].[Value] AS [Value], 
         [Extent1].[PackagingTransaction_ID] AS [PackagingTransaction_ID], 
         ROW_NUMBER() OVER (ORDER BY [Extent1].[TransactionDateTime] DESC, [Extent1].[ID] DESC) AS [row_number]
     FROM   
         [dbo].[LedgerTransaction] AS [Extent1]
     INNER JOIN 
         [dbo].[Organization] AS [Extent2] ON [Extent1].[OrganizationID] = [Extent2].[ID]
                                           AND [Extent2].[OrganizationTypeCode] = 2) AS [Filter1]
WHERE 
    [Filter1].[row_number] > 0
ORDER BY 
    [Filter1].[TransactionDateTime] DESC, [Filter1].[ID1] DESC

这是数据库结构：

组织：

ID  int Unchecked
ExternalID  int Unchecked
OrganizationTypeCode    tinyint Unchecked
Name    nvarchar(100)   Unchecked
Address nvarchar(50)    Checked

LedgerTransaction ：

ID  int Unchecked
TransactionDateTime datetime    Unchecked
TransactionType tinyint Unchecked
PackagingID int Unchecked
OrganizationID  int Unchecked
Amount  int Unchecked
Value   decimal(19, 4)  Unchecked

查询：

select count(*)
from LedgerTransaction

36529499


select count(*)
from Organization

17822

我尝试了

create index test_patrik
on Organization(Id, OrganizationTypeCode)

但这并没有带来任何改善。查询大约需要34秒才能运行。

Answer 1

对于此查询：

SELECT TOP (10) . . .
FROM (SELECT . . . 
      FROM [dbo].[LedgerTransaction] AS [Extent1] INNER JOIN
           [dbo].[Organization] AS [Extent2]
           ON [Extent1].[OrganizationID] = [Extent2].[ID] AND
              [Extent2].[OrganizationTypeCode] = 2
     ) AS [Filter1]
WHERE [Filter1].[row_number] > 0
ORDER BY [Filter1].[TransactionDateTime] DESC, [Filter1].[ID1] DESC;

您可以删除row_number()和外部WHERE条件。 row_number()始终大于0，因此这是多余的。

您无能为力。从Organization(OrganizationTypeCode, ID)，LedgerTransaction(OrganizationID)上的索引开始。

但是，外面的ORDER BY可能会花费大量时间，对此您几乎无能为力。

EF生成的SQL Server查询优化

1 个答案: