为什么我的执行计划与索引相同，但有时没有索引？

如何解决为什么我的执行计划与索引相同，但有时没有索引？

我在使用和不使用索引的情况下测试了我的程序以比较结果。我的问题是我不知道为什么我测试时我的空间索引在执行计划中没有显示，但有时在执行计划中缺少索引；我不知道为什么我有这个，有人可以帮忙吗？我的程序看起来像：

create procedure    [dbo].[p_search_vehicle]
@IdCustomer int,@idGroupVehicle int = null,@ResultCount int= null,@Radiant int= null 
 as
 begin
 if @IdCustomer is null
    begin
        print 'The argument cannot be null'
        return 
    end
 declare @start geography
 SET @start = (select location from Customer where idCustomer=@idCustomer )
 ---@Result null group null radiant null
    if @ResultCount is null and @idGroupVehicle is null and @Radiant is null
    select top 10 idVehicle,idGroupVehicle,brand,model,maxrange,weight,maxSpeed,nameLocation,@start.Stdistance(locationVehicle)/1000 as distanceInKm
        from Vehicle 
            where (@start.Stdistance(locationVehicle)/1000 is not null)
            order by @start.Stdistance(locationVehicle)/1000 asc
             ---@Result null  radiant null
            else if @ResultCount is null and @Radiant is null
    select  top 10 idVehicle,@start.Stdistance(locationVehicle)/1000 as distanceInKm
        from Vehicle 
            where  idGroupVehicle= @idGroupVehicle and (@start.Stdistance(locationVehicle)/1000  is not null)
            order by @start.Stdistance(locationVehicle)/1000 asc
             ---@Radiant null  
            else if @Radiant is null
    select TOP(@ResultCount) idVehicle,@start.Stdistance(locationVehicle)/1000 as distanceInKm
        from Vehicle 
            where idGroupVehicle= @idGroupVehicle  and  (@start.Stdistance(locationVehicle)/1000  is not null)
            order by @start.Stdistance(locationVehicle)/1000 asc
             ---@@idGroupVehicle  null @Radiant is null
            else if  @idGroupVehicle is null and @Radiant is null
    select TOP(@ResultCount) idVehicle,@start.Stdistance(locationVehicle)/1000 as distanceInKm
        from Vehicle 
            where  (@start.Stdistance(locationVehicle)/1000  is not null)
            order by @start.Stdistance(locationVehicle)/1000 asc
            ---@idGroupVehicle is null and @ResultCount is null
            else if  @idGroupVehicle is null and @ResultCount is null
    select top 10 idVehicle,@start.Stdistance(locationVehicle)/1000 as distanceInKm
        from Vehicle 
            where  (@start.Stdistance(locationVehicle)/1000   <= @Radiant)
            order by @start.Stdistance(locationVehicle)/1000 asc
        --- @idGroupVehicle is null 
            else if  @idGroupVehicle is null 
    select TOP(@ResultCount) idVehicle,@start.Stdistance(locationVehicle)/1000 as distanceInKm
        from Vehicle 
            where  (@start.Stdistance(locationVehicle)/1000   <= @Radiant)
            order by @start.Stdistance(locationVehicle)/1000 asc
            --- @Result is null 
            else if  @ResultCount is null 
    select TOP(10) idVehicle,@start.Stdistance(locationVehicle)/1000 as distanceInKm
        from Vehicle 
            where  idGroupVehicle= @idGroupVehicle and  (@start.Stdistance(locationVehicle)/1000   <= @Radiant)
            order by @start.Stdistance(locationVehicle)/1000 asc
            --- all options
    else
    select TOP(@ResultCount) idVehicle,@start.Stdistance(locationVehicle)/1000 as distanceInKm
        from Vehicle 
            where idGroupVehicle= @idGroupVehicle  and  (@start.Stdistance(locationVehicle)/1000  <= @Radiant)
            order by @start.Stdistance(locationVehicle)/1000 asc
 end
GO

这个程序返回离用户最近的车辆列表 我有一个桌子车辆的空间索引是

CREATE SPATIAL INDEX [SIndx_Vehicle_locationVehicle] ON [dbo].[Vehicle]
(
    [locationVehicle]
)USING  GEOGRAPHY_AUTO_GRID 
WITH (
CELLS_PER_OBJECT = 12,PAD_INDEX = OFF,STATISTICS_norECOmpuTE = OFF,SORT_IN_TEMPDB = OFF,DROP_EXISTING = OFF,ONLINE = OFF,ALLOW_ROW_LOCKS = ON,ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
GO

当我使用 set statistics io on 测试此过程时，我在执行计划中没有看到我的空间索引。我不知道为什么，但我有一条缺少索引的绿色消息。

谁能解释为什么我有索引和没有索引的执行计划相同？