Question

我有一个查询，将在4秒钟内执行。在执行它时，我将基于查询的项目的ID硬编码为：

DECLARE @Id UNIQUEIDENTIFIER = 'A130CD89-E3C6-4EB5-8CF5-A9142EAAA3DF'

然后我将完全相同的SQL转换为标量函数：

CREATE FUNCTION dbo.tmp ( @Id UNIQUEIDENTIFIER )
RETURNS INT
AS
BEGIN

--DECLARE @Id UNIQUEIDENTIFIER = 'A130CD89-E3C6-4EB5-8CF5-A9142EAAA3DF'


    -- Declare variable to work with.
    DECLARE @Layer0 VARCHAR(300), 
        @Layer1 VARCHAR(300), 
        @Layer2 VARCHAR(300), 
        @Layer3 VARCHAR(300), 
        @Layer4 VARCHAR(300), 
        @Layer5 VARCHAR(300), 
        @Layer6 VARCHAR(300), 
        @Layer7 VARCHAR(300), 
        @Layer8 VARCHAR(300), 
        @Layer9 VARCHAR(300),
        @FunctionalLayer0 VARCHAR(300), 
        @FunctionalLayer1 VARCHAR(300), 
        @FunctionalLayer2 VARCHAR(300), 
        @FunctionalLayer3 VARCHAR(300), 
        @FunctionalLayer4 VARCHAR(300), 
        @FunctionalLayer5 VARCHAR(300), 
        @FunctionalLayer6 VARCHAR(300), 
        @FunctionalLayer7 VARCHAR(300), 
        @FunctionalLayer8 VARCHAR(300), 
        @FunctionalLayer9 VARCHAR(300),
        @LayerIndex INT,
        @IsLocationRow BIT,
        @IsFunctionRow BIT,
        @IsPhysical BIT,
        @Result INT 

    -- Populate the variables to make querying easier to work with below.
    SELECT 
        @Layer0 = LocationLayer0, @Layer1 = LocationLayer1, @Layer2 = LocationLayer2, @Layer3 = LocationLayer3, 
        @Layer4 = LocationLayer4, @Layer5 = LocationLayer5, @Layer6 = LocationLayer6, @Layer7 = LocationLayer7, 
        @Layer8 = LocationLayer8, @Layer9 = LocationLayer9, 
        @FunctionalLayer0 = FunctionalLayer0, @FunctionalLayer1 = FunctionalLayer1, @FunctionalLayer2 = FunctionalLayer2, 
        @FunctionalLayer3 = FunctionalLayer3, @FunctionalLayer4 = FunctionalLayer4, @FunctionalLayer5 = FunctionalLayer5, 
        @FunctionalLayer6 = FunctionalLayer6, @FunctionalLayer7 = FunctionalLayer7, @FunctionalLayer8 = FunctionalLayer8, 
        @FunctionalLayer9 = FunctionalLayer9, @LayerIndex = LayerIndex, @IsPhysical = IsPhysical,
        @IsLocationRow = CASE WHEN @Layer0 IS NOT NULL THEN 1 ELSE 0 END,
        @IsFunctionRow = CASE WHEN @FunctionalLayer0 IS NOT NULL THEN 1 ELSE 0 END 
    FROM dbo.Asset
    WHERE Id = @Id

        -- Get the count.
        ;with deletedItems AS 
        (
            SELECT *
            FROM dbo.Asset 
            WHERE IsActive = 0 AND IsPhysical=0
        )
        SELECT @Result = (SELECT SUM(IIF(d.Id IS NULL, 1, 0)) 
        FROM dbo.Asset a
        LEFT JOIN deletedItems d
        ON     (d.LayerIndex = 0 AND ISNULL(a.LocationLayer0, '')= ISNULL(d.LocationLayer0,''))
            OR (d.LayerIndex = 1 AND ISNULL(a.LocationLayer0, '')= ISNULL(d.LocationLayer0,'') AND ISNULL(a.LocationLayer1,'') = ISNULL(d.LocationLayer1,''))
            OR (d.LayerIndex = 2 AND ISNULL(a.LocationLayer0, '')= ISNULL(d.LocationLayer0,'') AND ISNULL(a.LocationLayer1,'') = ISNULL(d.LocationLayer1,'') AND ISNULL(a.LocationLayer2,'') = ISNULL(d.LocationLayer2,''))
            OR (d.LayerIndex = 3 AND ISNULL(a.LocationLayer0, '')= ISNULL(d.LocationLayer0,'') AND ISNULL(a.LocationLayer1,'') = ISNULL(d.LocationLayer1,'') AND ISNULL(a.LocationLayer2,'') = ISNULL(d.LocationLayer2,'') AND ISNULL(a.LocationLayer3,'') = ISNULL(d.LocationLayer3,'')
            OR (d.LayerIndex = 4 AND ISNULL(a.LocationLayer0, '')= ISNULL(d.LocationLayer0,'') AND ISNULL(a.LocationLayer1,'') = ISNULL(d.LocationLayer1,'') AND ISNULL(a.LocationLayer2,'') = ISNULL(d.LocationLayer2,'') AND ISNULL(a.LocationLayer3,'') = ISNULL(d.LocationLayer3,'') AND ISNULL(a.LocationLayer4,'') = ISNULL(d.LocationLayer4,''))
            OR (d.LayerIndex = 5 AND ISNULL(a.LocationLayer0, '')= ISNULL(d.LocationLayer0,'') AND ISNULL(a.LocationLayer1,'') = ISNULL(d.LocationLayer1,'') AND ISNULL(a.LocationLayer2,'') = ISNULL(d.LocationLayer2,'') AND ISNULL(a.LocationLayer3,'') = ISNULL(d.LocationLayer3,'') AND ISNULL(a.LocationLayer4,'') = ISNULL(d.LocationLayer4,'') AND ISNULL(a.LocationLayer5,'') = ISNULL(d.LocationLayer5,''))
            OR (d.LayerIndex = 6 AND ISNULL(a.LocationLayer0, '')= ISNULL(d.LocationLayer0,'') AND ISNULL(a.LocationLayer1,'') = ISNULL(d.LocationLayer1,'') AND ISNULL(a.LocationLayer2,'') = ISNULL(d.LocationLayer2,'') AND ISNULL(a.LocationLayer3,'') = ISNULL(d.LocationLayer3,'') AND ISNULL(a.LocationLayer4,'') = ISNULL(d.LocationLayer4,'') AND ISNULL(a.LocationLayer5,'') = ISNULL(d.LocationLayer5,'') AND ISNULL(a.LocationLayer6,'') = ISNULL(d.LocationLayer6,''))
            OR (d.LayerIndex = 7 AND ISNULL(a.LocationLayer0, '')= ISNULL(d.LocationLayer0,'') AND ISNULL(a.LocationLayer1,'') = ISNULL(d.LocationLayer1,'') AND ISNULL(a.LocationLayer2,'') = ISNULL(d.LocationLayer2,'') AND ISNULL(a.LocationLayer3,'') = ISNULL(d.LocationLayer3,'') AND ISNULL(a.LocationLayer4,'') = ISNULL(d.LocationLayer4,'') AND ISNULL(a.LocationLayer5,'') = ISNULL(d.LocationLayer5,'') AND ISNULL(a.LocationLayer6,'') = ISNULL(d.LocationLayer6,'') AND ISNULL(a.LocationLayer7,'') = ISNULL(d.LocationLayer7,''))
            OR (d.LayerIndex = 8 AND ISNULL(a.LocationLayer0, '')= ISNULL(d.LocationLayer0,'') AND ISNULL(a.LocationLayer1,'') = ISNULL(d.LocationLayer1,'') AND ISNULL(a.LocationLayer2,'') = ISNULL(d.LocationLayer2,'') AND ISNULL(a.LocationLayer3,'') = ISNULL(d.LocationLayer3,'') AND ISNULL(a.LocationLayer4,'') = ISNULL(d.LocationLayer4,'') AND ISNULL(a.LocationLayer5,'') = ISNULL(d.LocationLayer5,'') AND ISNULL(a.LocationLayer6,'') = ISNULL(d.LocationLayer6,'') AND ISNULL(a.LocationLayer7,'') = ISNULL(d.LocationLayer7,'') AND ISNULL(a.LocationLayer8,'') = ISNULL(d.LocationLayer8,''))
            OR (d.LayerIndex = 9 AND ISNULL(a.LocationLayer0, '')= ISNULL(d.LocationLayer0,'') AND ISNULL(a.LocationLayer1,'') = ISNULL(d.LocationLayer1,'') AND ISNULL(a.LocationLayer2,'') = ISNULL(d.LocationLayer2,'') AND ISNULL(a.LocationLayer3,'') = ISNULL(d.LocationLayer3,'') AND ISNULL(a.LocationLayer4,'') = ISNULL(d.LocationLayer4,'') AND ISNULL(a.LocationLayer5,'') = ISNULL(d.LocationLayer5,'') AND ISNULL(a.LocationLayer6,'') = ISNULL(d.LocationLayer6,'') AND ISNULL(a.LocationLayer7,'') = ISNULL(d.LocationLayer7,'') AND ISNULL(a.LocationLayer8,'') = ISNULL(d.LocationLayer8,'') AND ISNULL(a.LocationLayer9,'') = ISNULL(d.LocationLayer9,''))

        ) 
        WHERE
                a.IsPhysical = 1 
            AND a.IsActive = 1
            AND (@Id IS NULL OR (
                    a.Id != @Id AND
                   (
                       (@LayerIndex = 0 AND ISNULL(a.LocationLayer0, '')= ISNULL(@Layer0,''))
                    OR (@LayerIndex = 1 AND ISNULL(a.LocationLayer0, '')= ISNULL(@Layer0,'') AND ISNULL(a.LocationLayer1,'') = ISNULL(@Layer1,''))
                    OR (@LayerIndex = 2 AND ISNULL(a.LocationLayer0, '')= ISNULL(@Layer0,'') AND ISNULL(a.LocationLayer1,'') = ISNULL(@Layer1,'') AND ISNULL(a.LocationLayer2,'') = ISNULL(@Layer2,''))
                    OR (@LayerIndex = 3 AND ISNULL(a.LocationLayer0, '')= ISNULL(@Layer0,'') AND ISNULL(a.LocationLayer1,'') = ISNULL(@Layer1,'') AND ISNULL(a.LocationLayer2,'') = ISNULL(@Layer2,'') AND ISNULL(a.LocationLayer3,'') = ISNULL(@Layer3,'')
                    OR (@LayerIndex = 4 AND ISNULL(a.LocationLayer0, '')= ISNULL(@Layer0,'') AND ISNULL(a.LocationLayer1,'') = ISNULL(@Layer1,'') AND ISNULL(a.LocationLayer2,'') = ISNULL(@Layer2,'') AND ISNULL(a.LocationLayer3,'') = ISNULL(@Layer3,'') AND ISNULL(a.LocationLayer4,'') = ISNULL(@Layer4,''))
                    OR (@LayerIndex = 5 AND ISNULL(a.LocationLayer0, '')= ISNULL(@Layer0,'') AND ISNULL(a.LocationLayer1,'') = ISNULL(@Layer1,'') AND ISNULL(a.LocationLayer2,'') = ISNULL(@Layer2,'') AND ISNULL(a.LocationLayer3,'') = ISNULL(@Layer3,'') AND ISNULL(a.LocationLayer4,'') = ISNULL(@Layer4,'') AND ISNULL(a.LocationLayer5,'') = ISNULL(@Layer5,''))
                    OR (@LayerIndex = 6 AND ISNULL(a.LocationLayer0, '')= ISNULL(@Layer0,'') AND ISNULL(a.LocationLayer1,'') = ISNULL(@Layer1,'') AND ISNULL(a.LocationLayer2,'') = ISNULL(@Layer2,'') AND ISNULL(a.LocationLayer3,'') = ISNULL(@Layer3,'') AND ISNULL(a.LocationLayer4,'') = ISNULL(@Layer4,'') AND ISNULL(a.LocationLayer5,'') = ISNULL(@Layer5,'') AND ISNULL(a.LocationLayer6,'') = ISNULL(@Layer6,''))
                    OR (@LayerIndex = 7 AND ISNULL(a.LocationLayer0, '')= ISNULL(@Layer0,'') AND ISNULL(a.LocationLayer1,'') = ISNULL(@Layer1,'') AND ISNULL(a.LocationLayer2,'') = ISNULL(@Layer2,'') AND ISNULL(a.LocationLayer3,'') = ISNULL(@Layer3,'') AND ISNULL(a.LocationLayer4,'') = ISNULL(@Layer4,'') AND ISNULL(a.LocationLayer5,'') = ISNULL(@Layer5,'') AND ISNULL(a.LocationLayer6,'') = ISNULL(@Layer6,'') AND ISNULL(a.LocationLayer7,'') = ISNULL(@Layer7,''))
                    OR (@LayerIndex = 8 AND ISNULL(a.LocationLayer0, '')= ISNULL(@Layer0,'') AND ISNULL(a.LocationLayer1,'') = ISNULL(@Layer1,'') AND ISNULL(a.LocationLayer2,'') = ISNULL(@Layer2,'') AND ISNULL(a.LocationLayer3,'') = ISNULL(@Layer3,'') AND ISNULL(a.LocationLayer4,'') = ISNULL(@Layer4,'') AND ISNULL(a.LocationLayer5,'') = ISNULL(@Layer5,'') AND ISNULL(a.LocationLayer6,'') = ISNULL(@Layer6,'') AND ISNULL(a.LocationLayer7,'') = ISNULL(@Layer7,'') AND ISNULL(a.LocationLayer8,'') = ISNULL(@Layer8,''))
                    OR (@LayerIndex = 9 AND ISNULL(a.LocationLayer0, '')= ISNULL(@Layer0,'') AND ISNULL(a.LocationLayer1,'') = ISNULL(@Layer1,'') AND ISNULL(a.LocationLayer2,'') = ISNULL(@Layer2,'') AND ISNULL(a.LocationLayer3,'') = ISNULL(@Layer3,'') AND ISNULL(a.LocationLayer4,'') = ISNULL(@Layer4,'') AND ISNULL(a.LocationLayer5,'') = ISNULL(@Layer5,'') AND ISNULL(a.LocationLayer6,'') = ISNULL(@Layer6,'') AND ISNULL(a.LocationLayer7,'') = ISNULL(@Layer7,'') AND ISNULL(a.LocationLayer8,'') = ISNULL(@Layer8,'') AND ISNULL(a.LocationLayer9,'') = ISNULL(@Layer9,''))
                    )
                ))
            )
            )


    RETURN ISNULL(@Result, 0)
end
GO

但是当我那时：

SELECT DBO.tmp('A130CD89-E3C6-4EB5-8CF5-A9142EAAA3DF')

我的结果（相同的值）在12秒内返回。

当只是将其更改为标量函数时，是什么导致相同代码的执行时间增加三倍？

编辑：我似乎已经修复了它。我怀疑参数嗅探问题。通过添加：

DECLARE @UseMe UNIQUEIDENTIFIER
SET @UseMe = @Id

该函数的顶部，然后在WHERE子句中使用@UseMe作为ID ...获得以SQL运行时获得的性能。

Answer 1

如果可能，请尝试使用inline-UDF重写代码：

CREATE FUNCTION dbo.tmp ( @Id UNIQUEIDENTIFIER )
RETURNS TABLE
AS
RETURN (SELECT ISNULL(..., 0));

更多信息：Why do SQL Server Scalar-valued functions get slower?

标量函数慢，但仅SQL快

1 个答案: