如何使用空间索引在 sql server 中测试程序？

Question

我有一个程序来返回最近的 vachile 列表，我使用空间索引来测试这个程序 我的程序是：

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,idGroupVehicle,brand,model,maxRange,weight,maxSpeed, nameLocation , @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,idGroupVehicle,brand,model,maxRange,weight,maxSpeed, nameLocation , @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,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
            ---@idGroupVehicle is null and @ResultCount is null
            else if  @idGroupVehicle is null and @ResultCount 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   <= @Radiant)
            order by @start.STDistance(locationVehicle)/1000 asc
        --- @idGroupVehicle is null 
            else if  @idGroupVehicle is null 
    select TOP(@ResultCount) idVehicle,idGroupVehicle,brand,model,maxRange,weight,maxSpeed, nameLocation , @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,idGroupVehicle,brand,model,maxRange,weight,maxSpeed, nameLocation , @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,idGroupVehicle,brand,model,maxRange,weight,maxSpeed, nameLocation , @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

我有表 Vehicle 并且在我的表中我有 locationVehicle 这条记录有地理类型并且在这条记录上我有这样的空间索引

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

但是当我测试我的程序以查看我的计划时，我在这个计划中没有看到我的空间索引，我不知道为什么有人可以告诉我为什么我没有看到执行计划中的空间索引？ 我只看到这个表的 pk 键

Answer 1

将 cmets 的长期讨论转化为答案，在您的查询中的几个地方将米转换为公里可能是这里的原因。让我们按顺序浏览它们：

1. @start.STDistance(locationVehicle)/1000 is not null。写成@start is not null and locationVechicle is not null 会更好吗？也就是说，如果两个地理空间点存在，它们之间会有一个距离（可能是 0，但即使这样仍然不为空`。

2. order by @start.STDistance(locationVehicle)/1000。最好写成order by @start.STDistance(locationVehicle)。如所写，SQL 必须计算@start 和表中每个点之间的距离，除以 1000，然后使用新计算的度量进行排序。简而言之，该部门已经变成了不可SARGable。

也就是说，我还将完全从数据库中删除米到公里的转换，并将其转移到您的应用程序层。这是一个很小的计算负担，这仍然是昂贵数据库服务器上的 CPU 周期，可以在更便宜（且更容易扩展）的应用层上完成。