T-SQL挿入 - テーブル変数の選択が非常に遅い

Question

私はテーブル変数を持っており、 "Insert Into - Select"ステートメントを使っていくつかの値を挿入しています。選択は少数の結合の組み合わせであり、別々に実行される場合は3秒かかる。問題は、コード全体が3〜4分かかることです。それには特別な理由があるのだろうか？

これは私のテーブル変数の宣言です：私はいくつかのデータを初期化し、他のテーブル変数を持ち、これは、その構造である

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) 
) 

：

DECLARE @TempTable TABLE 
(
    ProtoSurveyID INT, 
    ProductID NVARCHAR(25) PRIMARY KEY 
) 

、次のコードは、私の問題のステートメント（insert into - select）：

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 

私が前に言ったように、 sert lineクエリには3秒かかります。それ以外の場合は非常に長い時間です。

EDIT：これは私の実行計画です - コストの大部分はテーブルスキャンですが、なぜ挿入に時間がかかっていて、それがなくても素早く発生しますか？

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 

私はゆっくりと再び実行します：

フォローは私の新しいインライン関数です。任意のアイデアをどのように最適化するには？

Answer 1

テーブル変数に挿入するクエリは、並列プランを持つことはできません。

代わりに#tempテーブルを使用して、SELECTを並列化できるようにしてください。