有什么方法可以更好地构建这个 LINQ 查询？

如何解决有什么方法可以更好地构建这个 LINQ 查询？

我正在开发一个新的 WPF 应用程序。它需要在启动时在数据网格中显示查询的结果。在测试中，我发现在某些情况下，运行查询所需的时间可能是 2 分钟 - 长得令人无法接受。但是，在其他情况下，它可以更快。差异部分取决于应用程序的运行位置，我怀疑其他因素会影响它的运行速度。靠近服务器（本地）那么它只是几秒钟的事情，尽管它会在远离服务器的其他办公室运行得更快。我们大多数人仍然在家工作。在我家里，我的互联网速度非常快（就我所在的州而言），但我在该查询上的表现仍然很糟糕。

但我现在不知道对于与我一样远离服务器的用户来说，该查询的运行速度有多快。这是用于检索数据的 LINQ 查询。我可以更好地重构 LINQ 以获得更好的性能吗？

using (var ctx = new AppEntities())
{
    People = ctx.People.AsNoTracking().Where(p => p.Inactive == false)
        .Include(p => p.Agency)
        .Include(p => p.PersonnelCertifications.Select(pc => pc.CertificationType))
        .Where(p => p.PersonnelCertifications.Any(pc => pc.CertificationType.CertType == "Operator"))
        .OrderBy(p => p.LastName)
        .ThenBy(p => p.FirstName)
        .ToList();
}

这是主表 Person：

CREATE TABLE [app].[Person](
    [ID] [bigint] IDENTITY(1,1) NOT NULL,[AgencyID] [bigint] NOT NULL,[LastName] [nvarchar](25) NOT NULL,[FirstName] [nvarchar](20) NOT NULL,--other columns removed for brevity
 CONSTRAINT [PK_Person] PRIMARY KEY CLUSTERED 
(
    [ID] ASC
)WITH (PAD_INDEX = OFF,STATISTICS_norECOmpuTE = OFF,IGnorE_DUP_KEY = OFF,ALLOW_ROW_LOCKS = ON,ALLOW_PAGE_LOCKS = ON,FILLFACTOR = 100) ON [PRIMARY]
) ON [PRIMARY] TEXtimage_ON [PRIMARY]
GO

和表代理：

CREATE TABLE [app].[Agency](
    [ID] [bigint] IDENTITY(1,[AgencyCode] [nvarchar](5) NOT NULL,[AgencyName] [nvarchar](50) NULL,--other columns removed for brevity
 CONSTRAINT [PK_Agency] PRIMARY KEY CLUSTERED 
(
    [ID] ASC
)WITH (PAD_INDEX = OFF,FILLFACTOR = 100) ON [PRIMARY],CONSTRAINT [AK_AgencyCode] UNIQUE NONCLUSTERED 
(
    [AgencyCode] ASC
)WITH (PAD_INDEX = OFF,FILLFACTOR = 100) ON [PRIMARY]
) ON [PRIMARY] TEXtimage_ON [PRIMARY]
GO

并表PersonnelCertification：

CREATE TABLE [app].[PersonnelCertification](
    [ID] [bigint] IDENTITY(1,[CertificationTypeID] [bigint] NOT NULL,[PersonID] [bigint] NOT NULL,--other columns removed for brevity
 CONSTRAINT [PK_PersonnelCertification] PRIMARY KEY CLUSTERED 
(
    [ID] ASC
)WITH (PAD_INDEX = OFF,FILLFACTOR = 100) ON [PRIMARY]
) ON [PRIMARY]
GO

最后是表 CertificationType：

CREATE TABLE [app].[CertificationType](
    [ID] [bigint] IDENTITY(1,[CertType] [nvarchar](30) NOT NULL,--other columns removed for brevity
 CONSTRAINT [PK_CertificationType] PRIMARY KEY CLUSTERED 
(
    [ID] ASC
)WITH (PAD_INDEX = OFF,CONSTRAINT [CertType] UNIQUE NONCLUSTERED 
(
    [CertType] ASC
)WITH (PAD_INDEX = OFF,FILLFACTOR = 100) ON [PRIMARY]
) ON [PRIMARY]
GO