如何在Azure SQL数据库上优化SQL查询

Question

我有一个在Azure中的经典服务实例上运行的WCF服务。该服务使用Azure SQL数据库。

请求处理时间太长。

这是端到端交易的屏幕截图。我突出了对数据库的两个缓慢调用。

当我在Azure门户上查看“查询性能见解”时，发现这是最耗时的查询：

(@p__linq__0 nvarchar(4000),@p__linq__1 uniqueidentifier)SELECT 
    [Limit1].[ObfuscationType] AS [ObfuscationType], 
    [Limit1].[Id] AS [Id], 
    [Limit1].[Obfuscationsnummer] AS [Obfuscationsnummer], 
    [Limit1].[Object] AS [Object], 
    [Limit1].[Status] AS [Status], 
    [Limit1].[Organisation_CloudApiKey] AS [Organisation_CloudApiKey]
    FROM ( SELECT TOP (1) 
        [Extent1].[Id] AS [Id], 
        [Extent1].[Obfuscationsnummer] AS [Obfuscationsnummer], 
        [Extent1].[ObfuscationType] AS [ObfuscationType], 
        [Extent1].[Object] AS [Object], 
        [Extent1].[Status] AS [Status], 
        [Extent1].[Organisation_CloudApiKey] AS [Organisation_CloudApiKey]
        FROM [dbo].[CloudObject] AS [Extent1]
        WHERE (([Extent1].[Obfuscationsnummer] = @p__linq__0)
          OR (([Extent1].[Obfuscationsnummer] IS NULL) 
          AND (@p__linq__0 IS NULL))) 
          AND ([Extent1].[Organisation_CloudApiKey] = @p__linq__1)
    )  AS [Limit1]

现有索引

表上有三个现有索引：

1. IX_Organisation_CloudApiKey：

   在[dbo]上创建NONCLUSTERED索引[IX_Organisation_CloudApiKey]。[CloudObject] （     [Organisation_CloudApiKey] ASC ）与[STATISTICS_NORECOMPUTE = OFF，DROP_EXISTING = OFF，ONLINE = OFF）一起开启[PRIMARY] 开始

2. Azure自动生成的密钥：

   在[dbo]上创建NONCLUSTERED索引[nci_wi_CloudObject_7AD41B9985003F79D674]。[CloudObject] （     [Organisation_CloudApiKey] ASC ） 包含（[Obfuscationsnummer]），其中（STATISTICS_NORECOMPUTE = OFF，DROP_EXISTING = OFF，ONLINE = OFF）开启[主] 开始

3. 主键

问题

如何使该查询的性能更好？