Как подкачка запроса может быть * медленнее *? - PullRequest
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Как подкачка запроса может быть * медленнее *?

3 голосов
/ 31 октября 2011

Я синхронизирую время выполнения как запроса, так и одного и того же запроса, разбитого на страницы. 

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)) ;

Почему-то первый запрос занимает 0,5 секунды, а второй - в три раза дольше,Как это возможно?К сожалению, allIds довольно сложен, поэтому генерируемый SQL довольно длинный.Я использую Linq-to-SQL, поэтому я использовал Any вместо Contains, так как последний вызывает ошибку для сложных запросов, подобных этому.

EDIT

Похоже, что постраничный запрос выполняется быстрее (в абсолютных временах), когда возвращаемый набор результатов больше.Когда базовый запрос возвращает 6000 строк (до разбивки на страницы), версия с постраничным доступом запускается за 1,7 секунды.Когда базовый запрос возвращает 200 строк (до разбивки на страницы), версия с постраничным управлением запускается за 1,7 секунды.Это кажется мне безумным.

РЕДАКТИРОВАТЬ 2

Меня попросили предоставить планы выполнения запросов.Я просмотрел их обоих, и они кажутся идентичными, за исключением самого начала.Вот части, которые на самом деле отличаются.

НЕ СТРАНИЦЫ enter image description here

СТРАНИЦЫ enter image description here

КОНЕЦ РЕДАКТИРОВАНИЯ 

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

1 Ответ

2 голосов
/ 31 октября 2011

Вместо использования синтаксиса "select top X from", сгенерированный SQL использует функцию ROW_NUMBER (), а затем выбирает на основе этого.
Это, конечно, очень сложная операция, так как функция вызывается для каждой строки, и только после этого выполняется оценка предложения WHERE, а синтаксис «SELECT TOP X» просто останавливает выполнение после выбора X строк.

Я не могу сказать вам, возможно ли это исправить в LINQ2SQL, но я вполне уверен, что Entity Framework использует синтаксис «SELECT TOP X FROM», хотя я не могу сказать вам точно.

Я не знаю, насколько сложно вам перейти на Entity Framework, но я могу вам точно сказать, что это облегчит вашу жизнь во многих отношениях и будет намного лучше, если вы используете .NET 4.0 Entity Framework, а не .NET 3.5 SP1.

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