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C# 获取实体框架以使用SQL Server地理空间索引

c# sql-server entity-framework

C# 获取实体框架以使用SQL Server地理空间索引,c#,sql-server,entity-framework,geospatial,C#,Sql Server,Entity Framework,Geospatial,我们有一个非常简单的表，我们正试图用实体框架查询它，它看起来像这样： CREATE TABLE [dbo].[EFBlkFireRisks]( [EFBlkFireRiskId] [int] IDENTITY(1,1) NOT NULL, [EFStateId] [int] NOT NULL, [Lat] [decimal](18, 8) NOT NULL, [Lon] [decimal](18, 8) NOT NULL, [AdjustedPremium

我们有一个非常简单的表，我们正试图用实体框架查询它，它看起来像这样：

CREATE TABLE [dbo].[EFBlkFireRisks](
    [EFBlkFireRiskId] [int] IDENTITY(1,1) NOT NULL,
    [EFStateId] [int] NOT NULL,
    [Lat] [decimal](18, 8) NOT NULL,
    [Lon] [decimal](18, 8) NOT NULL,
    [AdjustedPremiumMultiplier] [decimal](18, 4) NOT NULL DEFAULT ((0)),
    [GeoLocation] [geography] NULL,
 CONSTRAINT [PK_dbo.EFBlkFireRisks] PRIMARY KEY CLUSTERED 
(
    [EFBlkFireRiskId] ASC
)

var geoPoint = SqlSchemaFunctions.GetDbGeography(lat, lon);
var query = ctx.BulkFireRisks
    .Where(x => x.EFStateId == stateId && x.GeoLocation.Distance(geoPoint) != null)
    .OrderBy(x => x.GeoLocation.Distance(geoPoint));
var bfr = query.First();

declare @p3 sys.geography set @p3=convert(sys.geography,0xE6100000010C8FC2F5285CFF434052B81E85EB515AC0)
declare @p4 sys.geography set @p4=convert(sys.geography,0xE6100000010C8FC2F5285CFF434052B81E85EB515AC0)
exec sp_executesql N'SELECT TOP (1) 
    [Project1].[EFBlkFireRiskId] AS [EFBlkFireRiskId], 
    [Project1].[EFStateId] AS [EFStateId], 
    [Project1].[GeoId] AS [GeoId], 
    [Project1].[Lat] AS [Lat], 
    [Project1].[Lon] AS [Lon], 
    [Project1].[GeoLocation] AS [GeoLocation], 
    [Project1].[AdjustedPremiumMultiplier] AS [AdjustedPremiumMultiplier],
    [Project1].C1 as Distance
    FROM ( SELECT 
        [Extent1].[GeoLocation].STDistance(@p__linq__1) AS [C1], 
        [Extent1].[EFBlkFireRiskId] AS [EFBlkFireRiskId], 
        [Extent1].[EFStateId] AS [EFStateId], 
        [Extent1].[GeoId] AS [GeoId], 
        [Extent1].[Lat] AS [Lat], 
        [Extent1].[Lon] AS [Lon], 
        [Extent1].[GeoLocation] AS [GeoLocation], 
        [Extent1].[AdjustedPremiumMultiplier] AS [AdjustedPremiumMultiplier]
        FROM [dbo].[EFBlkFireRisks] AS [Extent1]
        WHERE (11 = [Extent1].[EFStateId]) AND ([Extent1].[GeoLocation].STDistance(@p__linq__0) IS NOT NULL)
    )  AS [Project1]
    ORDER BY [Project1].[C1] ASC',N'@p__linq__0 [geography],@p__linq__1 [geography]',@p__linq__0=@p3,@p__linq__1=@p4

var geoPoint = DbGeography.PointFromText(string.Format("POINT({0} {1})", lon, lat), 4326);
var q2 = (from b in ctx.BulkFireRisks
          let distance = b.GeoLocation.Distance(geoPoint)
          where b.EFStateId == stateId && distance != null
          orderby distance
          select b);
var bfr = q2.First();
它在“地理位置”列上有一个地理空间索引，如下所示：

CREATE SPATIAL INDEX [IX_EFBlkFireRisks_Spatial] ON [dbo].[EFBlkFireRisks]
(
    [GeoLocation]
)USING  GEOGRAPHY_AUTO_GRID

declare @p3 sys.geography set @p3=convert(sys.geography,0xE6100000010C8FC2F5285CFF434052B81E85EB515AC0)
SELECT TOP (1) 
    [Project1].[EFBlkFireRiskId] AS [EFBlkFireRiskId], 
    [Project1].[EFStateId] AS [EFStateId], 
    [Project1].[GeoId] AS [GeoId], 
    [Project1].[Lat] AS [Lat], 
    [Project1].[Lon] AS [Lon], 
    [Project1].[GeoLocation] AS [GeoLocation], 
    [Project1].[AdjustedPremiumMultiplier] AS [AdjustedPremiumMultiplier],
    [Project1].C1 as Distance
    FROM ( SELECT 
        [Extent1].[GeoLocation].STDistance(@p3) AS [C1], 
        [Extent1].[EFBlkFireRiskId] AS [EFBlkFireRiskId], 
        [Extent1].[EFStateId] AS [EFStateId], 
        [Extent1].[GeoId] AS [GeoId], 
        [Extent1].[Lat] AS [Lat], 
        [Extent1].[Lon] AS [Lon], 
        [Extent1].[GeoLocation] AS [GeoLocation], 
        [Extent1].[AdjustedPremiumMultiplier] AS [AdjustedPremiumMultiplier]
        FROM [dbo].[EFBlkFireRisks] AS [Extent1]
        WHERE (11 = [Extent1].[EFStateId]) AND ([Extent1].[GeoLocation].STDistance(@p3) IS NOT NULL)
    )  AS [Project1]
    ORDER BY [Project1].[C1] asc
我们试图在表中找到最接近给定纬度/经度点的条目

C#查询如下所示：

CREATE TABLE [dbo].[EFBlkFireRisks](
    [EFBlkFireRiskId] [int] IDENTITY(1,1) NOT NULL,
    [EFStateId] [int] NOT NULL,
    [Lat] [decimal](18, 8) NOT NULL,
    [Lon] [decimal](18, 8) NOT NULL,
    [AdjustedPremiumMultiplier] [decimal](18, 4) NOT NULL DEFAULT ((0)),
    [GeoLocation] [geography] NULL,
 CONSTRAINT [PK_dbo.EFBlkFireRisks] PRIMARY KEY CLUSTERED 
(
    [EFBlkFireRiskId] ASC
)

var geoPoint = SqlSchemaFunctions.GetDbGeography(lat, lon);
var query = ctx.BulkFireRisks
    .Where(x => x.EFStateId == stateId && x.GeoLocation.Distance(geoPoint) != null)
    .OrderBy(x => x.GeoLocation.Distance(geoPoint));
var bfr = query.First();

declare @p3 sys.geography set @p3=convert(sys.geography,0xE6100000010C8FC2F5285CFF434052B81E85EB515AC0)
declare @p4 sys.geography set @p4=convert(sys.geography,0xE6100000010C8FC2F5285CFF434052B81E85EB515AC0)
exec sp_executesql N'SELECT TOP (1) 
    [Project1].[EFBlkFireRiskId] AS [EFBlkFireRiskId], 
    [Project1].[EFStateId] AS [EFStateId], 
    [Project1].[GeoId] AS [GeoId], 
    [Project1].[Lat] AS [Lat], 
    [Project1].[Lon] AS [Lon], 
    [Project1].[GeoLocation] AS [GeoLocation], 
    [Project1].[AdjustedPremiumMultiplier] AS [AdjustedPremiumMultiplier],
    [Project1].C1 as Distance
    FROM ( SELECT 
        [Extent1].[GeoLocation].STDistance(@p__linq__1) AS [C1], 
        [Extent1].[EFBlkFireRiskId] AS [EFBlkFireRiskId], 
        [Extent1].[EFStateId] AS [EFStateId], 
        [Extent1].[GeoId] AS [GeoId], 
        [Extent1].[Lat] AS [Lat], 
        [Extent1].[Lon] AS [Lon], 
        [Extent1].[GeoLocation] AS [GeoLocation], 
        [Extent1].[AdjustedPremiumMultiplier] AS [AdjustedPremiumMultiplier]
        FROM [dbo].[EFBlkFireRisks] AS [Extent1]
        WHERE (11 = [Extent1].[EFStateId]) AND ([Extent1].[GeoLocation].STDistance(@p__linq__0) IS NOT NULL)
    )  AS [Project1]
    ORDER BY [Project1].[C1] ASC',N'@p__linq__0 [geography],@p__linq__1 [geography]',@p__linq__0=@p3,@p__linq__1=@p4

var geoPoint = DbGeography.PointFromText(string.Format("POINT({0} {1})", lon, lat), 4326);
var q2 = (from b in ctx.BulkFireRisks
          let distance = b.GeoLocation.Distance(geoPoint)
          where b.EFStateId == stateId && distance != null
          orderby distance
          select b);
var bfr = q2.First();
查询生成的SQL基本上如下所示：

CREATE TABLE [dbo].[EFBlkFireRisks](
    [EFBlkFireRiskId] [int] IDENTITY(1,1) NOT NULL,
    [EFStateId] [int] NOT NULL,
    [Lat] [decimal](18, 8) NOT NULL,
    [Lon] [decimal](18, 8) NOT NULL,
    [AdjustedPremiumMultiplier] [decimal](18, 4) NOT NULL DEFAULT ((0)),
    [GeoLocation] [geography] NULL,
 CONSTRAINT [PK_dbo.EFBlkFireRisks] PRIMARY KEY CLUSTERED 
(
    [EFBlkFireRiskId] ASC
)

var geoPoint = SqlSchemaFunctions.GetDbGeography(lat, lon);
var query = ctx.BulkFireRisks
    .Where(x => x.EFStateId == stateId && x.GeoLocation.Distance(geoPoint) != null)
    .OrderBy(x => x.GeoLocation.Distance(geoPoint));
var bfr = query.First();

declare @p3 sys.geography set @p3=convert(sys.geography,0xE6100000010C8FC2F5285CFF434052B81E85EB515AC0)
declare @p4 sys.geography set @p4=convert(sys.geography,0xE6100000010C8FC2F5285CFF434052B81E85EB515AC0)
exec sp_executesql N'SELECT TOP (1) 
    [Project1].[EFBlkFireRiskId] AS [EFBlkFireRiskId], 
    [Project1].[EFStateId] AS [EFStateId], 
    [Project1].[GeoId] AS [GeoId], 
    [Project1].[Lat] AS [Lat], 
    [Project1].[Lon] AS [Lon], 
    [Project1].[GeoLocation] AS [GeoLocation], 
    [Project1].[AdjustedPremiumMultiplier] AS [AdjustedPremiumMultiplier],
    [Project1].C1 as Distance
    FROM ( SELECT 
        [Extent1].[GeoLocation].STDistance(@p__linq__1) AS [C1], 
        [Extent1].[EFBlkFireRiskId] AS [EFBlkFireRiskId], 
        [Extent1].[EFStateId] AS [EFStateId], 
        [Extent1].[GeoId] AS [GeoId], 
        [Extent1].[Lat] AS [Lat], 
        [Extent1].[Lon] AS [Lon], 
        [Extent1].[GeoLocation] AS [GeoLocation], 
        [Extent1].[AdjustedPremiumMultiplier] AS [AdjustedPremiumMultiplier]
        FROM [dbo].[EFBlkFireRisks] AS [Extent1]
        WHERE (11 = [Extent1].[EFStateId]) AND ([Extent1].[GeoLocation].STDistance(@p__linq__0) IS NOT NULL)
    )  AS [Project1]
    ORDER BY [Project1].[C1] ASC',N'@p__linq__0 [geography],@p__linq__1 [geography]',@p__linq__0=@p3,@p__linq__1=@p4

var geoPoint = DbGeography.PointFromText(string.Format("POINT({0} {1})", lon, lat), 4326);
var q2 = (from b in ctx.BulkFireRisks
          let distance = b.GeoLocation.Distance(geoPoint)
          where b.EFStateId == stateId && distance != null
          orderby distance
          select b);
var bfr = q2.First();
该查询不使用索引——将其放入循环并运行10次大约需要30秒（无论是通过SQL手动执行，还是通过C#中的EF运行）

但是，可以删除
sp_executesql
位，并直接运行查询，如下所示：

CREATE SPATIAL INDEX [IX_EFBlkFireRisks_Spatial] ON [dbo].[EFBlkFireRisks]
(
    [GeoLocation]
)USING  GEOGRAPHY_AUTO_GRID

declare @p3 sys.geography set @p3=convert(sys.geography,0xE6100000010C8FC2F5285CFF434052B81E85EB515AC0)
SELECT TOP (1) 
    [Project1].[EFBlkFireRiskId] AS [EFBlkFireRiskId], 
    [Project1].[EFStateId] AS [EFStateId], 
    [Project1].[GeoId] AS [GeoId], 
    [Project1].[Lat] AS [Lat], 
    [Project1].[Lon] AS [Lon], 
    [Project1].[GeoLocation] AS [GeoLocation], 
    [Project1].[AdjustedPremiumMultiplier] AS [AdjustedPremiumMultiplier],
    [Project1].C1 as Distance
    FROM ( SELECT 
        [Extent1].[GeoLocation].STDistance(@p3) AS [C1], 
        [Extent1].[EFBlkFireRiskId] AS [EFBlkFireRiskId], 
        [Extent1].[EFStateId] AS [EFStateId], 
        [Extent1].[GeoId] AS [GeoId], 
        [Extent1].[Lat] AS [Lat], 
        [Extent1].[Lon] AS [Lon], 
        [Extent1].[GeoLocation] AS [GeoLocation], 
        [Extent1].[AdjustedPremiumMultiplier] AS [AdjustedPremiumMultiplier]
        FROM [dbo].[EFBlkFireRisks] AS [Extent1]
        WHERE (11 = [Extent1].[EFStateId]) AND ([Extent1].[GeoLocation].STDistance(@p3) IS NOT NULL)
    )  AS [Project1]
    ORDER BY [Project1].[C1] asc
这个查询运行起来不是30秒，而是30毫秒

我在挠头。你知道为什么这两个查询有如此截然不同的执行模式吗？你知道如何让EF使用这个特殊的地理空间索引吗？我做错了什么

编辑6/18- 如果我尝试向较慢的
sp_executesql
查询添加索引提示，我会收到以下错误消息：

查询处理器无法为具有空间索引提示的查询生成查询计划。原因：空间索引不支持谓词中提供的比较器

同样的提示在另一个查询上有效——或者至少不会出错

慢速查询的查询计划如下所示：

CREATE TABLE [dbo].[EFBlkFireRisks](
    [EFBlkFireRiskId] [int] IDENTITY(1,1) NOT NULL,
    [EFStateId] [int] NOT NULL,
    [Lat] [decimal](18, 8) NOT NULL,
    [Lon] [decimal](18, 8) NOT NULL,
    [AdjustedPremiumMultiplier] [decimal](18, 4) NOT NULL DEFAULT ((0)),
    [GeoLocation] [geography] NULL,
 CONSTRAINT [PK_dbo.EFBlkFireRisks] PRIMARY KEY CLUSTERED 
(
    [EFBlkFireRiskId] ASC
)

var geoPoint = SqlSchemaFunctions.GetDbGeography(lat, lon);
var query = ctx.BulkFireRisks
    .Where(x => x.EFStateId == stateId && x.GeoLocation.Distance(geoPoint) != null)
    .OrderBy(x => x.GeoLocation.Distance(geoPoint));
var bfr = query.First();

declare @p3 sys.geography set @p3=convert(sys.geography,0xE6100000010C8FC2F5285CFF434052B81E85EB515AC0)
declare @p4 sys.geography set @p4=convert(sys.geography,0xE6100000010C8FC2F5285CFF434052B81E85EB515AC0)
exec sp_executesql N'SELECT TOP (1) 
    [Project1].[EFBlkFireRiskId] AS [EFBlkFireRiskId], 
    [Project1].[EFStateId] AS [EFStateId], 
    [Project1].[GeoId] AS [GeoId], 
    [Project1].[Lat] AS [Lat], 
    [Project1].[Lon] AS [Lon], 
    [Project1].[GeoLocation] AS [GeoLocation], 
    [Project1].[AdjustedPremiumMultiplier] AS [AdjustedPremiumMultiplier],
    [Project1].C1 as Distance
    FROM ( SELECT 
        [Extent1].[GeoLocation].STDistance(@p__linq__1) AS [C1], 
        [Extent1].[EFBlkFireRiskId] AS [EFBlkFireRiskId], 
        [Extent1].[EFStateId] AS [EFStateId], 
        [Extent1].[GeoId] AS [GeoId], 
        [Extent1].[Lat] AS [Lat], 
        [Extent1].[Lon] AS [Lon], 
        [Extent1].[GeoLocation] AS [GeoLocation], 
        [Extent1].[AdjustedPremiumMultiplier] AS [AdjustedPremiumMultiplier]
        FROM [dbo].[EFBlkFireRisks] AS [Extent1]
        WHERE (11 = [Extent1].[EFStateId]) AND ([Extent1].[GeoLocation].STDistance(@p__linq__0) IS NOT NULL)
    )  AS [Project1]
    ORDER BY [Project1].[C1] ASC',N'@p__linq__0 [geography],@p__linq__1 [geography]',@p__linq__0=@p3,@p__linq__1=@p4

var geoPoint = DbGeography.PointFromText(string.Format("POINT({0} {1})", lon, lat), 4326);
var q2 = (from b in ctx.BulkFireRisks
          let distance = b.GeoLocation.Distance(geoPoint)
          where b.EFStateId == stateId && distance != null
          orderby distance
          select b);
var bfr = q2.First();

换句话说，它没有获取地理空间索引。快速版本的查询计划正在提取索引，看起来像您期望的那样：

declare @p3 sys.geography
set @p3=convert(sys.geography,0xE6100000010C8FC2F5285CFF434052B81E85EB515AC0)
exec sp_executesql N'SELECT TOP (1) 
    [Project1].[EFBlkFireRiskId] AS [EFBlkFireRiskId], 
    [Project1].[EFStateId] AS [EFStateId], 
    [Project1].[GeoId] AS [GeoId], 
    [Project1].[Lat] AS [Lat], 
    [Project1].[Lon] AS [Lon], 
    [Project1].[GeoLocation] AS [GeoLocation], 
    [Project1].[AdjustedPremiumMultiplier] AS [AdjustedPremiumMultiplier]
    FROM ( SELECT 
        [Extent1].[EFBlkFireRiskId] AS [EFBlkFireRiskId], 
        [Extent1].[EFStateId] AS [EFStateId], 
        [Extent1].[GeoId] AS [GeoId], 
        [Extent1].[Lat] AS [Lat], 
        [Extent1].[Lon] AS [Lon], 
        [Extent1].[GeoLocation] AS [GeoLocation], 
        [Extent1].[AdjustedPremiumMultiplier] AS [AdjustedPremiumMultiplier], 
        [Extent1].[GeoLocation].STDistance(@p__linq__0) AS [C1]
        FROM [dbo].[EFBlkFireRisks] AS [Extent1]
        WHERE (11 = [Extent1].[EFStateId]) AND ([Extent1].[GeoLocation].STDistance(@p__linq__0) IS NOT NULL)
    )  AS [Project1]
    ORDER BY [Project1].[C1] ASC',N'@p__linq__0 [geography]',@p__linq__0=@p3

这在SQL Server 2014上运行：

（Microsoft SQL Server 2014-12.0.2000.8（X64） 2014年2月20日20:04:26 版权所有（c）微软公司 Windows NT 6.3（版本9600:）上的快速版（64位）

好的，我知道了

结果表明，这两个查询并不完全相同：
sp_executesql
版本有两个参数，而快速版本只有一个：这就是关键。此查询（只有一个参数）的执行与您预期的一样：

declare @p3 sys.geography
set @p3=convert(sys.geography,0xE6100000010C8FC2F5285CFF434052B81E85EB515AC0)
exec sp_executesql N'SELECT TOP (1) 
    [Project1].[EFBlkFireRiskId] AS [EFBlkFireRiskId], 
    [Project1].[EFStateId] AS [EFStateId], 
    [Project1].[GeoId] AS [GeoId], 
    [Project1].[Lat] AS [Lat], 
    [Project1].[Lon] AS [Lon], 
    [Project1].[GeoLocation] AS [GeoLocation], 
    [Project1].[AdjustedPremiumMultiplier] AS [AdjustedPremiumMultiplier]
    FROM ( SELECT 
        [Extent1].[EFBlkFireRiskId] AS [EFBlkFireRiskId], 
        [Extent1].[EFStateId] AS [EFStateId], 
        [Extent1].[GeoId] AS [GeoId], 
        [Extent1].[Lat] AS [Lat], 
        [Extent1].[Lon] AS [Lon], 
        [Extent1].[GeoLocation] AS [GeoLocation], 
        [Extent1].[AdjustedPremiumMultiplier] AS [AdjustedPremiumMultiplier], 
        [Extent1].[GeoLocation].STDistance(@p__linq__0) AS [C1]
        FROM [dbo].[EFBlkFireRisks] AS [Extent1]
        WHERE (11 = [Extent1].[EFStateId]) AND ([Extent1].[GeoLocation].STDistance(@p__linq__0) IS NOT NULL)
    )  AS [Project1]
    ORDER BY [Project1].[C1] ASC',N'@p__linq__0 [geography]',@p__linq__0=@p3
在LINQ中获取该查询的方法如下：

CREATE TABLE [dbo].[EFBlkFireRisks](
    [EFBlkFireRiskId] [int] IDENTITY(1,1) NOT NULL,
    [EFStateId] [int] NOT NULL,
    [Lat] [decimal](18, 8) NOT NULL,
    [Lon] [decimal](18, 8) NOT NULL,
    [AdjustedPremiumMultiplier] [decimal](18, 4) NOT NULL DEFAULT ((0)),
    [GeoLocation] [geography] NULL,
 CONSTRAINT [PK_dbo.EFBlkFireRisks] PRIMARY KEY CLUSTERED 
(
    [EFBlkFireRiskId] ASC
)

var geoPoint = SqlSchemaFunctions.GetDbGeography(lat, lon);
var query = ctx.BulkFireRisks
    .Where(x => x.EFStateId == stateId && x.GeoLocation.Distance(geoPoint) != null)
    .OrderBy(x => x.GeoLocation.Distance(geoPoint));
var bfr = query.First();

declare @p3 sys.geography set @p3=convert(sys.geography,0xE6100000010C8FC2F5285CFF434052B81E85EB515AC0)
declare @p4 sys.geography set @p4=convert(sys.geography,0xE6100000010C8FC2F5285CFF434052B81E85EB515AC0)
exec sp_executesql N'SELECT TOP (1) 
    [Project1].[EFBlkFireRiskId] AS [EFBlkFireRiskId], 
    [Project1].[EFStateId] AS [EFStateId], 
    [Project1].[GeoId] AS [GeoId], 
    [Project1].[Lat] AS [Lat], 
    [Project1].[Lon] AS [Lon], 
    [Project1].[GeoLocation] AS [GeoLocation], 
    [Project1].[AdjustedPremiumMultiplier] AS [AdjustedPremiumMultiplier],
    [Project1].C1 as Distance
    FROM ( SELECT 
        [Extent1].[GeoLocation].STDistance(@p__linq__1) AS [C1], 
        [Extent1].[EFBlkFireRiskId] AS [EFBlkFireRiskId], 
        [Extent1].[EFStateId] AS [EFStateId], 
        [Extent1].[GeoId] AS [GeoId], 
        [Extent1].[Lat] AS [Lat], 
        [Extent1].[Lon] AS [Lon], 
        [Extent1].[GeoLocation] AS [GeoLocation], 
        [Extent1].[AdjustedPremiumMultiplier] AS [AdjustedPremiumMultiplier]
        FROM [dbo].[EFBlkFireRisks] AS [Extent1]
        WHERE (11 = [Extent1].[EFStateId]) AND ([Extent1].[GeoLocation].STDistance(@p__linq__0) IS NOT NULL)
    )  AS [Project1]
    ORDER BY [Project1].[C1] ASC',N'@p__linq__0 [geography],@p__linq__1 [geography]',@p__linq__0=@p3,@p__linq__1=@p4

var geoPoint = DbGeography.PointFromText(string.Format("POINT({0} {1})", lon, lat), 4326);
var q2 = (from b in ctx.BulkFireRisks
          let distance = b.GeoLocation.Distance(geoPoint)
          where b.EFStateId == stateId && distance != null
          orderby distance
          select b);
var bfr = q2.First();
关键是只定义一次任何
sys.geography
变量。

Hms，似乎是MS SQL server的问题。您是否尝试过使用提供的查询分析器工具？（请参阅）另外，在您的查询中，如果通过使用
with
关键字强制索引，会发生什么情况？@flindeberg-快速查询的查询计划与您预期的一样。慢速查询的查询计划仅显示为
Execute Proc:Cost 0.0%
。我编辑了上面的答案，以显示尝试使用
with（index）时会发生什么（IX_efblkfirefrisks_Spatial））
hint。@flindeberg-请参阅我上面的编辑。带有hint的
错误被排除，慢速查询的查询计划试图脱离主聚集索引-它没有使用（显然无法使用）地理空间索引。很高兴你找到了它，这肯定会有更多帮助：）