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如何分頁查詢*速度較慢*？

2011-10-31 77 views
3

我正在計算查詢和相同查詢的頁面執行時間。如何分頁查詢*速度較慢*？

foreach (var x in productSource.OrderBy(p => p.AdminDisplayName) 
     .Where(p => allIds.Any(val => val == p.SiteProductId))) ; 

foreach (var x in productSource.OrderBy(p => p.AdminDisplayName) 
     .Where(p => allIds.Any(val => val == p.SiteProductId)).Skip(20).Take(20)) ;

不知何故，第一個查詢需要0.5秒，第二個查詢需要三倍的時間。這怎麼可能？不幸的是​​相當複雜，所以生成的SQL很長。我正在使用Linq-to-SQL，這就是爲什麼我使用Any而不是Contains，因爲後者會導致這樣的複雜查詢出錯。

編輯

它看起來像分頁查詢運行速度更快（絕對時間）時，返回的結果集較大。當基本查詢返回6000行（分頁之前）時，分頁版本運行時間爲1.7秒。當基本查詢返回200行（分頁之前）時，分頁版本運行時間爲1.7秒。這對我來說似乎很瘋狂。

EDIT 2

我被要求提供查詢執行計劃。我仔細觀察了兩者，除了一開始，它們看起來是完全相同的。以下是實際不同的部分。

NOT尋呼 enter image description here

尋呼 enter image description here

END EDIT

SELECT [t0].[SiteProductId], [t0].[SiteId], [t0].[SiteDivisionId], [t0].[ProductDisplayId], [t0].[ItemId], [t0].[SiteProductTypeId], [t0].[PrimaryParentSiteCategoryId], [t0].[PrimaryParentSiteProductId], [t0].[PrimaryChildSiteProductId], [t0].[UsesMasterPrice], [t0].[ListPrice], [t0].[SalePrice], [t0].[ShowWasIsPricing], [t0].[ArrivalDate], [t0].[SiteUrlKey], [t0].[IsDisplayedOnIndexPages], [t0].[HasDetailPage], [t0].[IsPersonalizable], [t0].[RequiresPersonalization], [t0].[ShowPersonalizationInline], [t0].[PzTemplateId], [t0].[AdminDisplayName], [t0].[DetailPageHeading], [t0].[SiteLabelForIndex], [t0].[SiteLabelForDetail], [t0].[UsesVariantAttributes], [t0].[VariantSelectionPrompt], [t0].[VariantSelectionOptionLabel], [t0].[VariantSortOrder], [t0].[VariantSelectionImageAssignmentId], [t0].[IndexImageAssignmentId], [t0].[DetailImageAssignmentId], [t0].[SiteProductDescription], [t0].[SiteTargetSearchTerms], [t0].[SiteWebPageTitle], [t0].[SiteWebPageKeywords], [t0].[SiteWebPageDescription], [t0].[ItemStatusId], [t0].[UsesMasterInventory], [t0].[CurrentInventory], [t0].[RestockDate], [t0].[IsBackorderable], [t0].[IsPreorderable], [t0].[OutOfStockLevel], [t0].[CreatedBy], [t0].[CreatedDT], [t0].[ModifiedBy], [t0].[ModifiedDT], [t0].[UsesPixamiPreview], [t0].[ShowsDynamicPreview], [t0].[IsNewProduct], [t0].[IsExclusiveProduct], [t0].[IsInternetOnlyProduct], [t0].[IsCustomerFavorite], [t0].[StartDate], [t0].[EndDate], [t0].[InternalKeywords], [t0].[ProductAlert], [t0].[AdditionalProductInfo], [t0].[UsesPixamiPz], [t0].[IsFreeGift], [t2].[test], [t2].[ItemId] AS [ItemId2], [t2].[ItemSku], [t2].[ErpItemId], [t2].[SupplierSku], [t2].[VendorSku], [t2].[UPC], [t2].[SerialNumber], [t2].[DisplayName], [t2].[IsPersonalizable] AS [IsPersonalizable2], [t2].[RequiresPersonalization] AS [RequiresPersonalization2], [t2].[ListPrice] AS [ListPrice2], [t2].[ItemTypeId], [t2].[ItemTypeCode], [t2].[DisplayIndividuallyOnSite], [t2].[ItemStatusId] AS [ItemStatusId2], [t2].[ItemStatusCode], [t2].[ParentItemId], [t2].[VariantTemplateCode], [t2].[PzFormatCode], [t2].[OmsPzTemplateId], [t2].[Height], [t2].[Width], [t2].[Depth], [t2].[Weight], [t2].[CurrentInventory] AS [CurrentInventory2], [t2].[RestockDate] AS [RestockDate2], [t2].[IsTaxable], [t2].[PostHand], [t2].[LastSyncDate], [t2].[CreatedBy] AS [CreatedBy2], [t2].[CreatedDT] AS [CreatedDT2], [t2].[ModifiedBy] AS [ModifiedBy2], [t2].[ModifiedDT] AS [ModifiedDT2] 
FROM [dbo].[SiteProduct] AS [t0] 
LEFT OUTER JOIN (
    SELECT 1 AS [test], [t1].[ItemId], [t1].[ItemSku], [t1].[ErpItemId], [t1].[SupplierSku], [t1].[VendorSku], [t1].[UPC], [t1].[SerialNumber], [t1].[DisplayName], [t1].[IsPersonalizable], [t1].[RequiresPersonalization], [t1].[ListPrice], [t1].[ItemTypeId], [t1].[ItemTypeCode], [t1].[DisplayIndividuallyOnSite], [t1].[ItemStatusId], [t1].[ItemStatusCode], [t1].[ParentItemId], [t1].[VariantTemplateCode], [t1].[PzFormatCode], [t1].[OmsPzTemplateId], [t1].[Height], [t1].[Width], [t1].[Depth], [t1].[Weight], [t1].[CurrentInventory], [t1].[RestockDate], [t1].[IsTaxable], [t1].[PostHand], [t1].[LastSyncDate], [t1].[CreatedBy], [t1].[CreatedDT], [t1].[ModifiedBy], [t1].[ModifiedDT] 
    FROM [dbo].[ItemMaster] AS [t1] 
    ) AS [t2] ON [t2].[ItemId] = [t0].[ItemId] 
WHERE EXISTS(
    SELECT NULL AS [EMPTY] 
    FROM (
     SELECT [t43].[SiteProductId] 
     FROM (
      SELECT [t28].[SiteProductId] 
      FROM (
       SELECT [t13].[SiteProductId] 
       FROM (
        SELECT [t3].[SiteProductId] 
        FROM [dbo].[SiteProduct] AS [t3] 
        LEFT OUTER JOIN [dbo].[ItemMaster] AS [t4] ON [t4].[ItemId] = [t3].[ItemId] 
        WHERE ([t3].[SiteProductTypeId] <> @p0) AND (([t3].[AdminDisplayName] LIKE @p1) OR ([t4].[ItemSku] LIKE @p2)) AND ([t3].[SiteId] = @p3) 
        UNION 
        SELECT [t12].[SiteProductId] 
        FROM (
         SELECT [t5].[SiteProductId] 
         FROM [dbo].[SiteProduct] AS [t5] 
         LEFT OUTER JOIN [dbo].[ItemMaster] AS [t6] ON [t6].[ItemId] = [t5].[ItemId] 
         WHERE ([t5].[PrimaryParentSiteProductId] IS NOT NULL) AND (EXISTS(
          SELECT NULL AS [EMPTY] 
          FROM (
           SELECT [t7].[PrimaryParentSiteProductId] AS [value], [t7].[PrimaryParentSiteProductId], [t7].[SiteProductTypeId], [t7].[AdminDisplayName], [t8].[ItemSku], [t7].[SiteId] 
           FROM [dbo].[SiteProduct] AS [t7] 
           LEFT OUTER JOIN [dbo].[ItemMaster] AS [t8] ON [t8].[ItemId] = [t7].[ItemId] 
           ) AS [t9] 
          WHERE ([t9].[value] = ([t5].[PrimaryParentSiteProductId])) AND ([t9].[PrimaryParentSiteProductId] IS NOT NULL) AND ([t9].[SiteProductTypeId] <> @p4) AND (([t9].[AdminDisplayName] LIKE @p5) OR ([t9].[ItemSku] LIKE @p6)) AND ([t9].[SiteId] = @p7) 
          )) 
         UNION 
         SELECT [t10].[PrimaryParentSiteProductId] AS [value] 
         FROM [dbo].[SiteProduct] AS [t10] 
         LEFT OUTER JOIN [dbo].[ItemMaster] AS [t11] ON [t11].[ItemId] = [t10].[ItemId] 
         WHERE ([t10].[PrimaryParentSiteProductId] IS NOT NULL) AND ([t10].[SiteProductTypeId] <> @p8) AND (([t10].[AdminDisplayName] LIKE @p9) OR ([t11].[ItemSku] LIKE @p10)) AND ([t10].[SiteId] = @p11) 
         ) AS [t12] 
        ) AS [t13] 
       UNION 
       SELECT [t14].[ParentSiteProductId] 
       FROM [dbo].[SiteProductAssociation] AS [t14] 
       INNER JOIN [dbo].[SiteProductAssociationType] AS [t15] ON [t15].[SiteProductAssociationTypeId] = [t14].[SiteProductAssociationTypeId] 
       WHERE (EXISTS(
        SELECT NULL AS [EMPTY] 
        FROM (
         SELECT [t26].[SiteProductId] 
         FROM (
          SELECT [t16].[SiteProductId] 
          FROM [dbo].[SiteProduct] AS [t16] 
          LEFT OUTER JOIN [dbo].[ItemMaster] AS [t17] ON [t17].[ItemId] = [t16].[ItemId] 
          WHERE ([t16].[SiteProductTypeId] <> @p12) AND (([t16].[AdminDisplayName] LIKE @p13) OR ([t17].[ItemSku] LIKE @p14)) AND ([t16].[SiteId] = @p15) 
          UNION 
          SELECT [t25].[SiteProductId] 
          FROM (
           SELECT [t18].[SiteProductId] 
           FROM [dbo].[SiteProduct] AS [t18] 
           LEFT OUTER JOIN [dbo].[ItemMaster] AS [t19] ON [t19].[ItemId] = [t18].[ItemId] 
           WHERE ([t18].[PrimaryParentSiteProductId] IS NOT NULL) AND (EXISTS(
            SELECT NULL AS [EMPTY] 
            FROM (
             SELECT [t20].[PrimaryParentSiteProductId] AS [value], [t20].[PrimaryParentSiteProductId], [t20].[SiteProductTypeId], [t20].[AdminDisplayName], [t21].[ItemSku], [t20].[SiteId] 
             FROM [dbo].[SiteProduct] AS [t20] 
             LEFT OUTER JOIN [dbo].[ItemMaster] AS [t21] ON [t21].[ItemId] = [t20].[ItemId] 
             ) AS [t22] 
            WHERE ([t22].[value] = ([t18].[PrimaryParentSiteProductId])) AND ([t22].[PrimaryParentSiteProductId] IS NOT NULL) AND ([t22].[SiteProductTypeId] <> @p16) AND (([t22].[AdminDisplayName] LIKE @p17) OR ([t22].[ItemSku] LIKE @p18)) AND ([t22].[SiteId] = @p19) 
            )) 
           UNION 
           SELECT [t23].[PrimaryParentSiteProductId] AS [value] 
           FROM [dbo].[SiteProduct] AS [t23] 
           LEFT OUTER JOIN [dbo].[ItemMaster] AS [t24] ON [t24].[ItemId] = [t23].[ItemId] 
           WHERE ([t23].[PrimaryParentSiteProductId] IS NOT NULL) AND ([t23].[SiteProductTypeId] <> @p20) AND (([t23].[AdminDisplayName] LIKE @p21) OR ([t24].[ItemSku] LIKE @p22)) AND ([t23].[SiteId] = @p23) 
           ) AS [t25] 
          ) AS [t26] 
         ) AS [t27] 
        WHERE [t27].[SiteProductId] = [t14].[ChildSiteProductId] 
        )) AND ([t14].[SiteProductAssociationTypeId] = @p24) 
       ) AS [t28] 
      UNION 
      SELECT [t29].[ChildSiteProductId] 
      FROM [dbo].[SiteProductAssociation] AS [t29] 
      INNER JOIN [dbo].[SiteProductAssociationType] AS [t30] ON [t30].[SiteProductAssociationTypeId] = [t29].[SiteProductAssociationTypeId] 
      WHERE (EXISTS(
       SELECT NULL AS [EMPTY] 
       FROM (
        SELECT [t41].[SiteProductId] 
        FROM (
         SELECT [t31].[SiteProductId] 
         FROM [dbo].[SiteProduct] AS [t31] 
         LEFT OUTER JOIN [dbo].[ItemMaster] AS [t32] ON [t32].[ItemId] = [t31].[ItemId] 
         WHERE ([t31].[SiteProductTypeId] <> @p25) AND (([t31].[AdminDisplayName] LIKE @p26) OR ([t32].[ItemSku] LIKE @p27)) AND ([t31].[SiteId] = @p28) 
         UNION 
         SELECT [t40].[SiteProductId] 
         FROM (
          SELECT [t33].[SiteProductId] 
          FROM [dbo].[SiteProduct] AS [t33] 
          LEFT OUTER JOIN [dbo].[ItemMaster] AS [t34] ON [t34].[ItemId] = [t33].[ItemId] 
          WHERE ([t33].[PrimaryParentSiteProductId] IS NOT NULL) AND (EXISTS(
           SELECT NULL AS [EMPTY] 
           FROM (
            SELECT [t35].[PrimaryParentSiteProductId] AS [value], [t35].[PrimaryParentSiteProductId], [t35].[SiteProductTypeId], [t35].[AdminDisplayName], [t36].[ItemSku], [t35].[SiteId] 
            FROM [dbo].[SiteProduct] AS [t35] 
            LEFT OUTER JOIN [dbo].[ItemMaster] AS [t36] ON [t36].[ItemId] = [t35].[ItemId] 
            ) AS [t37] 
           WHERE ([t37].[value] = ([t33].[PrimaryParentSiteProductId])) AND ([t37].[PrimaryParentSiteProductId] IS NOT NULL) AND ([t37].[SiteProductTypeId] <> @p29) AND (([t37].[AdminDisplayName] LIKE @p30) OR ([t37].[ItemSku] LIKE @p31)) AND ([t37].[SiteId] = @p32) 
           )) 
          UNION 
          SELECT [t38].[PrimaryParentSiteProductId] AS [value] 
          FROM [dbo].[SiteProduct] AS [t38] 
          LEFT OUTER JOIN [dbo].[ItemMaster] AS [t39] ON [t39].[ItemId] = [t38].[ItemId] 
          WHERE ([t38].[PrimaryParentSiteProductId] IS NOT NULL) AND ([t38].[SiteProductTypeId] <> @p33) AND (([t38].[AdminDisplayName] LIKE @p34) OR ([t39].[ItemSku] LIKE @p35)) AND ([t38].[SiteId] = @p36) 
          ) AS [t40] 
         ) AS [t41] 
        ) AS [t42] 
       WHERE [t42].[SiteProductId] = [t29].[ParentSiteProductId] 
       )) AND ([t29].[SiteProductAssociationTypeId] = @p37) 
      ) AS [t43] 
     ) AS [t44] 
    WHERE [t44].[SiteProductId] = [t0].[SiteProductId] 
    ) 
ORDER BY [t0].[AdminDisplayName] 
-- Context: SqlProvider(Sql2008) Model: AttributedMetaModel Build: 4.0.30319.1 

SELECT [t45].[SiteProductId], [t45].[SiteId], [t45].[SiteDivisionId], [t45].[ProductDisplayId], [t45].[ItemId], [t45].[SiteProductTypeId], [t45].[PrimaryParentSiteCategoryId], [t45].[PrimaryParentSiteProductId], [t45].[PrimaryChildSiteProductId], [t45].[UsesMasterPrice], [t45].[ListPrice], [t45].[SalePrice], [t45].[ShowWasIsPricing], [t45].[ArrivalDate], [t45].[SiteUrlKey], [t45].[IsDisplayedOnIndexPages], [t45].[HasDetailPage], [t45].[IsPersonalizable], [t45].[RequiresPersonalization], [t45].[ShowPersonalizationInline], [t45].[PzTemplateId], [t45].[AdminDisplayName], [t45].[DetailPageHeading], [t45].[SiteLabelForIndex], [t45].[SiteLabelForDetail], [t45].[UsesVariantAttributes], [t45].[VariantSelectionPrompt], [t45].[VariantSelectionOptionLabel], [t45].[VariantSortOrder], [t45].[VariantSelectionImageAssignmentId], [t45].[IndexImageAssignmentId], [t45].[DetailImageAssignmentId], [t45].[SiteProductDescription], [t45].[SiteTargetSearchTerms], [t45].[SiteWebPageTitle], [t45].[SiteWebPageKeywords], [t45].[SiteWebPageDescription], [t45].[ItemStatusId], [t45].[UsesMasterInventory], [t45].[CurrentInventory], [t45].[RestockDate], [t45].[IsBackorderable], [t45].[IsPreorderable], [t45].[OutOfStockLevel], [t45].[CreatedBy], [t45].[CreatedDT], [t45].[ModifiedBy], [t45].[ModifiedDT], [t45].[UsesPixamiPreview], [t45].[ShowsDynamicPreview], [t45].[IsNewProduct], [t45].[IsExclusiveProduct], [t45].[IsInternetOnlyProduct], [t45].[IsCustomerFavorite], [t45].[StartDate], [t45].[EndDate], [t45].[InternalKeywords], [t45].[ProductAlert], [t45].[AdditionalProductInfo], [t45].[UsesPixamiPz], [t45].[IsFreeGift], [t45].[test], [t45].[ItemId2], [t45].[ItemSku], [t45].[ErpItemId], [t45].[SupplierSku], [t45].[VendorSku], [t45].[UPC], [t45].[SerialNumber], [t45].[DisplayName], [t45].[IsPersonalizable2], [t45].[RequiresPersonalization2], [t45].[ListPrice2], [t45].[ItemTypeId], [t45].[ItemTypeCode], [t45].[DisplayIndividuallyOnSite], [t45].[ItemStatusId2], [t45].[ItemStatusCode], [t45].[ParentItemId], [t45].[VariantTemplateCode], [t45].[PzFormatCode], [t45].[OmsPzTemplateId], [t45].[Height], [t45].[Width], [t45].[Depth], [t45].[Weight], [t45].[CurrentInventory2], [t45].[RestockDate2], [t45].[IsTaxable], [t45].[PostHand], [t45].[LastSyncDate], [t45].[CreatedBy2], [t45].[CreatedDT2], [t45].[ModifiedBy2], [t45].[ModifiedDT2] 
FROM (
    SELECT ROW_NUMBER() OVER (ORDER BY [t0].[AdminDisplayName]) AS [ROW_NUMBER], [t0].[SiteProductId], [t0].[SiteId], [t0].[SiteDivisionId], [t0].[ProductDisplayId], [t0].[ItemId], [t0].[SiteProductTypeId], [t0].[PrimaryParentSiteCategoryId], [t0].[PrimaryParentSiteProductId], [t0].[PrimaryChildSiteProductId], [t0].[UsesMasterPrice], [t0].[ListPrice], [t0].[SalePrice], [t0].[ShowWasIsPricing], [t0].[ArrivalDate], [t0].[SiteUrlKey], [t0].[IsDisplayedOnIndexPages], [t0].[HasDetailPage], [t0].[IsPersonalizable], [t0].[RequiresPersonalization], [t0].[ShowPersonalizationInline], [t0].[PzTemplateId], [t0].[AdminDisplayName], [t0].[DetailPageHeading], [t0].[SiteLabelForIndex], [t0].[SiteLabelForDetail], [t0].[UsesVariantAttributes], [t0].[VariantSelectionPrompt], [t0].[VariantSelectionOptionLabel], [t0].[VariantSortOrder], [t0].[VariantSelectionImageAssignmentId], [t0].[IndexImageAssignmentId], [t0].[DetailImageAssignmentId], [t0].[SiteProductDescription], [t0].[SiteTargetSearchTerms], [t0].[SiteWebPageTitle], [t0].[SiteWebPageKeywords], [t0].[SiteWebPageDescription], [t0].[ItemStatusId], [t0].[UsesMasterInventory], [t0].[CurrentInventory], [t0].[RestockDate], [t0].[IsBackorderable], [t0].[IsPreorderable], [t0].[OutOfStockLevel], [t0].[CreatedBy], [t0].[CreatedDT], [t0].[ModifiedBy], [t0].[ModifiedDT], [t0].[UsesPixamiPreview], [t0].[ShowsDynamicPreview], [t0].[IsNewProduct], [t0].[IsExclusiveProduct], [t0].[IsInternetOnlyProduct], [t0].[IsCustomerFavorite], [t0].[StartDate], [t0].[EndDate], [t0].[InternalKeywords], [t0].[ProductAlert], [t0].[AdditionalProductInfo], [t0].[UsesPixamiPz], [t0].[IsFreeGift], [t2].[test], [t2].[ItemId] AS [ItemId2], [t2].[ItemSku], [t2].[ErpItemId], [t2].[SupplierSku], [t2].[VendorSku], [t2].[UPC], [t2].[SerialNumber], [t2].[DisplayName], [t2].[IsPersonalizable] AS [IsPersonalizable2], [t2].[RequiresPersonalization] AS [RequiresPersonalization2], [t2].[ListPrice] AS [ListPrice2], [t2].[ItemTypeId], [t2].[ItemTypeCode], [t2].[DisplayIndividuallyOnSite], [t2].[ItemStatusId] AS [ItemStatusId2], [t2].[ItemStatusCode], [t2].[ParentItemId], [t2].[VariantTemplateCode], [t2].[PzFormatCode], [t2].[OmsPzTemplateId], [t2].[Height], [t2].[Width], [t2].[Depth], [t2].[Weight], [t2].[CurrentInventory] AS [CurrentInventory2], [t2].[RestockDate] AS [RestockDate2], [t2].[IsTaxable], [t2].[PostHand], [t2].[LastSyncDate], [t2].[CreatedBy] AS [CreatedBy2], [t2].[CreatedDT] AS [CreatedDT2], [t2].[ModifiedBy] AS [ModifiedBy2], [t2].[ModifiedDT] AS [ModifiedDT2] 
    FROM [dbo].[SiteProduct] AS [t0] 
    LEFT OUTER JOIN (
     SELECT 1 AS [test], [t1].[ItemId], [t1].[ItemSku], [t1].[ErpItemId], [t1].[SupplierSku], [t1].[VendorSku], [t1].[UPC], [t1].[SerialNumber], [t1].[DisplayName], [t1].[IsPersonalizable], [t1].[RequiresPersonalization], [t1].[ListPrice], [t1].[ItemTypeId], [t1].[ItemTypeCode], [t1].[DisplayIndividuallyOnSite], [t1].[ItemStatusId], [t1].[ItemStatusCode], [t1].[ParentItemId], [t1].[VariantTemplateCode], [t1].[PzFormatCode], [t1].[OmsPzTemplateId], [t1].[Height], [t1].[Width], [t1].[Depth], [t1].[Weight], [t1].[CurrentInventory], [t1].[RestockDate], [t1].[IsTaxable], [t1].[PostHand], [t1].[LastSyncDate], [t1].[CreatedBy], [t1].[CreatedDT], [t1].[ModifiedBy], [t1].[ModifiedDT] 
     FROM [dbo].[ItemMaster] AS [t1] 
     ) AS [t2] ON [t2].[ItemId] = [t0].[ItemId] 
    WHERE EXISTS(
     SELECT NULL AS [EMPTY] 
     FROM (
      SELECT [t43].[SiteProductId] 
      FROM (
       SELECT [t28].[SiteProductId] 
       FROM (
        SELECT [t13].[SiteProductId] 
        FROM (
         SELECT [t3].[SiteProductId] 
         FROM [dbo].[SiteProduct] AS [t3] 
         LEFT OUTER JOIN [dbo].[ItemMaster] AS [t4] ON [t4].[ItemId] = [t3].[ItemId] 
         WHERE ([t3].[SiteProductTypeId] <> @p0) AND (([t3].[AdminDisplayName] LIKE @p1) OR ([t4].[ItemSku] LIKE @p2)) AND ([t3].[SiteId] = @p3) 
         UNION 
         SELECT [t12].[SiteProductId] 
         FROM (
          SELECT [t5].[SiteProductId] 
          FROM [dbo].[SiteProduct] AS [t5] 
          LEFT OUTER JOIN [dbo].[ItemMaster] AS [t6] ON [t6].[ItemId] = [t5].[ItemId] 
          WHERE ([t5].[PrimaryParentSiteProductId] IS NOT NULL) AND (EXISTS(
           SELECT NULL AS [EMPTY] 
           FROM (
            SELECT [t7].[PrimaryParentSiteProductId] AS [value], [t7].[PrimaryParentSiteProductId], [t7].[SiteProductTypeId], [t7].[AdminDisplayName], [t8].[ItemSku], [t7].[SiteId] 
            FROM [dbo].[SiteProduct] AS [t7] 
            LEFT OUTER JOIN [dbo].[ItemMaster] AS [t8] ON [t8].[ItemId] = [t7].[ItemId] 
            ) AS [t9] 
           WHERE ([t9].[value] = ([t5].[PrimaryParentSiteProductId])) AND ([t9].[PrimaryParentSiteProductId] IS NOT NULL) AND ([t9].[SiteProductTypeId] <> @p4) AND (([t9].[AdminDisplayName] LIKE @p5) OR ([t9].[ItemSku] LIKE @p6)) AND ([t9].[SiteId] = @p7) 
           )) 
          UNION 
          SELECT [t10].[PrimaryParentSiteProductId] AS [value] 
          FROM [dbo].[SiteProduct] AS [t10] 
          LEFT OUTER JOIN [dbo].[ItemMaster] AS [t11] ON [t11].[ItemId] = [t10].[ItemId] 
          WHERE ([t10].[PrimaryParentSiteProductId] IS NOT NULL) AND ([t10].[SiteProductTypeId] <> @p8) AND (([t10].[AdminDisplayName] LIKE @p9) OR ([t11].[ItemSku] LIKE @p10)) AND ([t10].[SiteId] = @p11) 
          ) AS [t12] 
         ) AS [t13] 
        UNION 
        SELECT [t14].[ParentSiteProductId] 
        FROM [dbo].[SiteProductAssociation] AS [t14] 
        INNER JOIN [dbo].[SiteProductAssociationType] AS [t15] ON [t15].[SiteProductAssociationTypeId] = [t14].[SiteProductAssociationTypeId] 
        WHERE (EXISTS(
         SELECT NULL AS [EMPTY] 
         FROM (
          SELECT [t26].[SiteProductId] 
          FROM (
           SELECT [t16].[SiteProductId] 
           FROM [dbo].[SiteProduct] AS [t16] 
           LEFT OUTER JOIN [dbo].[ItemMaster] AS [t17] ON [t17].[ItemId] = [t16].[ItemId] 
           WHERE ([t16].[SiteProductTypeId] <> @p12) AND (([t16].[AdminDisplayName] LIKE @p13) OR ([t17].[ItemSku] LIKE @p14)) AND ([t16].[SiteId] = @p15) 
           UNION 
           SELECT [t25].[SiteProductId] 
           FROM (
            SELECT [t18].[SiteProductId] 
            FROM [dbo].[SiteProduct] AS [t18] 
            LEFT OUTER JOIN [dbo].[ItemMaster] AS [t19] ON [t19].[ItemId] = [t18].[ItemId] 
            WHERE ([t18].[PrimaryParentSiteProductId] IS NOT NULL) AND (EXISTS(
             SELECT NULL AS [EMPTY] 
             FROM (
              SELECT [t20].[PrimaryParentSiteProductId] AS [value], [t20].[PrimaryParentSiteProductId], [t20].[SiteProductTypeId], [t20].[AdminDisplayName], [t21].[ItemSku], [t20].[SiteId] 
              FROM [dbo].[SiteProduct] AS [t20] 
              LEFT OUTER JOIN [dbo].[ItemMaster] AS [t21] ON [t21].[ItemId] = [t20].[ItemId] 
              ) AS [t22] 
             WHERE ([t22].[value] = ([t18].[PrimaryParentSiteProductId])) AND ([t22].[PrimaryParentSiteProductId] IS NOT NULL) AND ([t22].[SiteProductTypeId] <> @p16) AND (([t22].[AdminDisplayName] LIKE @p17) OR ([t22].[ItemSku] LIKE @p18)) AND ([t22].[SiteId] = @p19) 
             )) 
            UNION 
            SELECT [t23].[PrimaryParentSiteProductId] AS [value] 
            FROM [dbo].[SiteProduct] AS [t23] 
            LEFT OUTER JOIN [dbo].[ItemMaster] AS [t24] ON [t24].[ItemId] = [t23].[ItemId] 
            WHERE ([t23].[PrimaryParentSiteProductId] IS NOT NULL) AND ([t23].[SiteProductTypeId] <> @p20) AND (([t23].[AdminDisplayName] LIKE @p21) OR ([t24].[ItemSku] LIKE @p22)) AND ([t23].[SiteId] = @p23) 
            ) AS [t25] 
           ) AS [t26] 
          ) AS [t27] 
         WHERE [t27].[SiteProductId] = [t14].[ChildSiteProductId] 
         )) AND ([t14].[SiteProductAssociationTypeId] = @p24) 
        ) AS [t28] 
       UNION 
       SELECT [t29].[ChildSiteProductId] 
       FROM [dbo].[SiteProductAssociation] AS [t29] 
       INNER JOIN [dbo].[SiteProductAssociationType] AS [t30] ON [t30].[SiteProductAssociationTypeId] = [t29].[SiteProductAssociationTypeId] 
       WHERE (EXISTS(
        SELECT NULL AS [EMPTY] 
        FROM (
         SELECT [t41].[SiteProductId] 
         FROM (
          SELECT [t31].[SiteProductId] 
          FROM [dbo].[SiteProduct] AS [t31] 
          LEFT OUTER JOIN [dbo].[ItemMaster] AS [t32] ON [t32].[ItemId] = [t31].[ItemId] 
          WHERE ([t31].[SiteProductTypeId] <> @p25) AND (([t31].[AdminDisplayName] LIKE @p26) OR ([t32].[ItemSku] LIKE @p27)) AND ([t31].[SiteId] = @p28) 
          UNION 
          SELECT [t40].[SiteProductId] 
          FROM (
           SELECT [t33].[SiteProductId] 
           FROM [dbo].[SiteProduct] AS [t33] 
           LEFT OUTER JOIN [dbo].[ItemMaster] AS [t34] ON [t34].[ItemId] = [t33].[ItemId] 
           WHERE ([t33].[PrimaryParentSiteProductId] IS NOT NULL) AND (EXISTS(
            SELECT NULL AS [EMPTY] 
            FROM (
             SELECT [t35].[PrimaryParentSiteProductId] AS [value], [t35].[PrimaryParentSiteProductId], [t35].[SiteProductTypeId], [t35].[AdminDisplayName], [t36].[ItemSku], [t35].[SiteId] 
             FROM [dbo].[SiteProduct] AS [t35] 
             LEFT OUTER JOIN [dbo].[ItemMaster] AS [t36] ON [t36].[ItemId] = [t35].[ItemId] 
             ) AS [t37] 
            WHERE ([t37].[value] = ([t33].[PrimaryParentSiteProductId])) AND ([t37].[PrimaryParentSiteProductId] IS NOT NULL) AND ([t37].[SiteProductTypeId] <> @p29) AND (([t37].[AdminDisplayName] LIKE @p30) OR ([t37].[ItemSku] LIKE @p31)) AND ([t37].[SiteId] = @p32) 
            )) 
           UNION 
           SELECT [t38].[PrimaryParentSiteProductId] AS [value] 
           FROM [dbo].[SiteProduct] AS [t38] 
           LEFT OUTER JOIN [dbo].[ItemMaster] AS [t39] ON [t39].[ItemId] = [t38].[ItemId] 
           WHERE ([t38].[PrimaryParentSiteProductId] IS NOT NULL) AND ([t38].[SiteProductTypeId] <> @p33) AND (([t38].[AdminDisplayName] LIKE @p34) OR ([t39].[ItemSku] LIKE @p35)) AND ([t38].[SiteId] = @p36) 
           ) AS [t40] 
          ) AS [t41] 
         ) AS [t42] 
        WHERE [t42].[SiteProductId] = [t29].[ParentSiteProductId] 
        )) AND ([t29].[SiteProductAssociationTypeId] = @p37) 
       ) AS [t43] 
      ) AS [t44] 
     WHERE [t44].[SiteProductId] = [t0].[SiteProductId] 
     ) 
    ) AS [t45] 
WHERE [t45].[ROW_NUMBER] BETWEEN @p38 + 1 AND @p38 + @p39 
ORDER BY [t45].[ROW_NUMBER] 
-- Context: SqlProvider(Sql2008) Model: AttributedMetaModel Build: 4.0.30319.1

來源

2011-10-31 Adam Rackis

+0

SQL是否向第一位或第二位的LINQ查詢顯示了我們的SQL？即生成的SQL有什麼區別嗎？ –

+0

@Branko - 兩者。我可以看到唯一的區別是第二個包含用於分頁的ROW_NUMBER OVER函數。 –

+0

您能否將SQL的兩個版本（包含和不包含ROW_NUMBER）都複製粘貼到SQL Server Management Studio中，並查看執行計劃是否有任何區別？您不需要提供用於生成執行計劃的實際參數值，因此您應該可以在不做任何修改的情況下粘貼SQL文本。 –

回答

2

代替使用 「選擇從頂部X」 的語法的，所生成的SQL使用ROW_NUMBER（）功能，並根據它進行選擇。
這當然是一個非常繁重的操作，因爲每行都會調用該函數，只有這樣纔會評估「WHERE」子句，而「SELECT TOP X」語法僅在選擇X行後停止執行。

我不能告訴你，如果有可能在LINQ2SQL來解決這個問題，但我敢肯定的實體框架使用「SELECT TOP X的」語法，雖然我不能告訴你肯定。

我不知道你轉移到實體框架有多複雜，但我可以肯定地告訴你它會讓你的生活變得更容易，並且性能會更好，只要你使用了。 NET 4.0實體框架而不是.NET 3.5 SP1。

來源

2011-10-31 16:08:16 Svarog

+0

你知道爲什麼帶有ROW_NUMBER（）的分頁版本實際上運行得非常快，當我的搜索參數產生很大的結果嗎？當我的查詢返回6000行時，分頁版本的運行速度與未分頁版本一樣快。但是當搜索只返回100個項目時，分頁版本的速度會減慢。 –

+0

無法確定地告訴你。將需要您的數據庫運行查詢並查看執行計劃。我可以肯定地告訴你的是，對於「SELECT TOP X」，分頁版本的運行速度會比平常快。 – Svarog

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