Tsql T-SQL插入-表变量中的Select非常慢
我有一个表变量,使用Insert Into-Select语句在其中插入一些值。select是几个连接的组合,单独执行时需要3秒钟。问题是整个代码需要3-4分钟才能执行。我想知道这有什么特别的原因 这是my table变量声明:Tsql T-SQL插入-表变量中的Select非常慢,tsql,variables,select,insert,Tsql,Variables,Select,Insert,我有一个表变量,使用Insert Into-Select语句在其中插入一些值。select是几个连接的组合,单独执行时需要3秒钟。问题是整个代码需要3-4分钟才能执行。我想知道这有什么特别的原因 这是my table变量声明: DECLARE @Result TABLE ( ProductID NVARCHAR(25) PRIMARY KEY ,ProductName NVARCHAR(100) ,ProductCategoryID TINYINT ,Prod
DECLARE @Result TABLE
(
ProductID NVARCHAR(25) PRIMARY KEY
,ProductName NVARCHAR(100)
,ProductCategoryID TINYINT
,ProductCategory NVARCHAR(50)
,ProductSubCategoryID TINYINT
,ProductSubCategory NVARCHAR(50)
,BrandID TINYINT
,Brand NVARCHAR(50)
)
我还有一个表变量,我用一些数据初始化它,这是它的结构:
DECLARE @TempTable TABLE
(
ProtoSurveyID INT,
ProductID NVARCHAR(25) PRIMARY KEY
)
下面的代码是我的问题陈述插入-选择:
INSERT INTO @Result (ProductID,ProductName,ProductCategoryID,ProductCategory,ProductSubCategoryID,ProductSubCategory,BrandID,Brand)
SELECT
Products.ProductID AS ProductID
,Products.ProductName AS ProductName
,ProductCategories.ProductCategoryID AS ProductCategoryID
,ProductCategories.ProductCategory AS ProductCategory
,ProductSubCategories.ProductSubCategoryID AS ProductSubCategoryID
,ProductSubCategories.ProductSubCategory AS ProductSubCategory
,Brands.BrandID AS BrandID
,Brands.Brand AS Brand
FROM
(
SELECT
CAST(A.Col001 AS tinyint) AS ProductCategoryID
,CAST(A.Col002 AS tinyint) AS BrandID
,CAST(A.Col003 AS nvarchar(25)) AS ProductID
,CAST(A.Col004 AS nvarchar(100)) AS ProductName
,CAST(A.Col006 As tinyint) AS ProductSubCategoryID
,B.ProtoSurveyID
FROM DataSetsMaterializedDataSqlvariant A
INNER JOIN @TempTable B
ON B.ProductID=CAST(A.Col003 AS nvarchar(25))
WHERE DataSetsMaterializedInternalRowsetID = 3
) Products
INNER JOIN
(
SELECT CAST(A.Col001 AS tinyint) AS BrandID
, CAST(A.Col002 AS nvarchar(50)) AS Brand
FROM DataSetsMaterializedDataSqlvariant A
WHERE DataSetsMaterializedInternalRowsetID = 1
)Brands On Products.BrandID=Brands.BrandID
INNER JOIN
(
SELECT CAST(A.Col001 AS tinyint) AS ProductCategoryID
,CAST(A.Col002 AS nvarchar(50)) AS ProductCategory
FROM DataSetsMaterializedDataSqlvariant A
WHERE DataSetsMaterializedInternalRowsetID = 2
) ProductCategories On Products.ProductCategoryID=ProductCategories.ProductCategoryID
INNER JOIN
(
SELECT CAST(A.Col001 AS tinyint) AS ProductSubCategoryID
, CAST(A.Col002 AS nvarchar(50)) AS ProductSubCategory
FROM DataSetsMaterializedDataSqlvariant A
WHERE DataSetsMaterializedInternalRowsetID = 11
) ProductSubCategories on Products.ProductSubCategoryID=ProductSubCategories.ProductSubCategoryID
正如我之前所说的,如果我对插入行进行注释,查询需要3秒钟,否则会花费很长时间
编辑:这是我的执行计划-大部分成本是表扫描,但为什么在插入时要花费这么多时间,而没有插入时又恰好是quick
下面是我的新内联函数:
CREATE FUNCTION [dbo].[fn_XxCustom_RetailAudits_GetProductsForFilter]
(
@SecurityObjectUserID BIGINT
)
RETURNS TABLE
AS
RETURN
WITH CTE(ProtoSurveyID,ProductID) AS
(
SELECT DISTINCT CAST(B.ProtoSurveyID AS INT)
,CAST(A.Col002 AS NVARCHAR(25)) AS ProductID
FROM DataSetsMaterializedDataSqlvariant A
JOIN SurveyInstances B ON A.Col001=B.SurveyInstanceID AND CAST(B.ProtoSurveyID AS INT) IN (SELECT ProtoSurveyID FROM dbo.fn_Filter_GetProtoSurveysAllowedShort(@SecurityObjectUserID, 'CLIENTACCESS',NULL))
WHERE DataSetsMaterializedInternalRowsetID = 5
)
SELECT
Products.ProductID AS ProductID
,Products.ProductName AS ProductName
,ProductCategories.ProductCategoryID AS ProductCategoryID
,ProductCategories.ProductCategory AS ProductCategory
,ProductSubCategories.ProductSubCategoryID AS ProductSubCategoryID
,ProductSubCategories.ProductSubCategory AS ProductSubCategory
,Brands.BrandID AS BrandID
,Brands.Brand AS Brand
FROM
(
SELECT
CAST(A.Col001 AS tinyint) AS ProductCategoryID
,CAST(A.Col002 AS tinyint) AS BrandID
,CAST(A.Col003 AS nvarchar(25)) AS ProductID
,CAST(A.Col004 AS nvarchar(100)) AS ProductName
,CAST(A.Col006 As tinyint) AS ProductSubCategoryID
,B.ProtoSurveyID
FROM CTE B
INNER JOIN DataSetsMaterializedDataSqlvariant A
ON B.ProductID=CAST(A.Col003 AS nvarchar(25))
WHERE DataSetsMaterializedInternalRowsetID = 3
) Products
INNER JOIN
(
SELECT CAST(A.Col001 AS tinyint) AS BrandID
,CAST(A.Col002 AS nvarchar(50)) AS Brand
FROM DataSetsMaterializedDataSqlvariant A
WHERE DataSetsMaterializedInternalRowsetID = 1
)Brands On Products.BrandID=Brands.BrandID
INNER JOIN
(
SELECT CAST(A.Col001 AS tinyint) AS ProductCategoryID
,CAST(A.Col002 AS nvarchar(50)) AS ProductCategory
FROM DataSetsMaterializedDataSqlvariant A
WHERE DataSetsMaterializedInternalRowsetID = 2
) ProductCategories On Products.ProductCategoryID=ProductCategories.ProductCategoryID
INNER JOIN
(
SELECT CAST(A.Col001 AS tinyint) AS ProductSubCategoryID
,CAST(A.Col002 AS nvarchar(50)) AS ProductSubCategory
FROM DataSetsMaterializedDataSqlvariant A
WHERE DataSetsMaterializedInternalRowsetID = 11
) ProductSubCategories on Products.ProductSubCategoryID=ProductSubCategories.ProductSubCategoryID
GO
我又慢跑了。如何优化它?插入表变量的查询不能有并行计划
尝试使用临时表,以允许并行选择。使用查询分析器的“解释计划”按钮显示时间的位置。@JeffWatkins我将在我的问题上附上带有执行计划的屏幕截图。如果选择临时表,会发生什么情况?@MarkRobinson你是指临时表吗?@marc_,是的,这解决了我的问题。@Joro-你能把它改写成一个内联TVF而不是多语句TVF吗?这样就完全不需要插入中间表变量。这意味着您将查询重写为单个语句。使用CTE或派生表替换@TempTable@MartinSmith我可以使用任何类型的函数,但我认为返回表的唯一方法是这个?@Joro-不,有两种不同类型的TVF。内联语句的效率更高,因为它们被优化程序内联,但需要在单个SQL语句中表达逻辑。@MartinSmith是的,谢谢,我明白了。我会这样做的。再次感谢。@Joro-。因此,使用CTEProtoSurveyID,ProductID作为选择不同的TOP 2147483647 CASTB.ProtoSurveyID作为INT,CASTA.Col002作为NVARCHAR25 FROM。。。B.ProtoSurveyID订购