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c# - 分页查询如何*慢*?

转载 作者:行者123 更新时间:2023-11-30 17:15:31 29 4
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我正在计时查询和同一个查询的执行时间,分页。

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,第一个查询耗时 0.5 秒,而第二个查询耗时三倍。这怎么可能?不幸的是 allIds 相当复杂,因此生成的 SQL 非常长。我正在使用 Linq-to-SQL,这就是我使用 Any 而不是 Contains 的原因,因为后者会导致像这样的复杂查询出错。

编辑

当返回的结果集较大时,分页查询运行得更快(绝对时间)。当基本查询返回 6,000 行(分页前)时,分页版本运行 1.7 秒。当基本查询返回 200 行(分页前)时,分页版本运行 1.7 秒。这对我来说似乎很疯狂。

编辑 2

我被要求提供查询执行计划。我已经浏览过它们两个,它们看起来是相同的,除了最开始。以下是实际不同的部分。

未分页 enter image description here

分页 enter image description here

结束编辑

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

最佳答案

生成的 SQL 没有使用“select top X from”语法,而是使用 ROW_NUMBER() 函数,然后根据它进行选择。
这当然是一个非常繁重的操作,因为为每一行调用该函数,然后才评估“WHERE”子句,而“SELECT TOP X”语法只是在选择 X 行后停止执行。

我不能告诉你是否可以在 LINQ2SQL 中修复这个问题,但我很确定 Entity Framework 使用“SELECT TOP X FROM”语法,虽然我不能肯定地告诉你。

我不知道迁移到 Entity Framework 对您来说有多复杂,但我可以肯定地告诉您,如果您使用 .NET 4.0,它将在很多方面让您的生活更轻松,并且性能会更好 Entity Framework 而不是 .NET 3.5 SP1。

关于c# - 分页查询如何*慢*?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/7955626/

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