Първо използвам код на обект. Индексирани колони:
- SourceCatalogId
- хора с увреждания
- CategoryPath
40 000 реда в таблицата,
Проблемът ми е, че заявката отнема 40 секунди!!
var result = DBContext.Set<SourceProduct>()
.Include(x => x.SalesHistories, x => x.SourceCatalog)
.Where(p => p.SourceCatalogId == 2)
.where(p => p.Disabled == false)
.where(x => x.CategoryPath.StartsWith("MyPath"))
.orderby(x => x.ShortDesignation)
.Skip(1)
.Take(10)
.toList();
SQL чрез sql профилиране:
exec sp_executesql N'SELECT TOP (10)
[Project1].[SourceProductId] AS [SourceProductId],
[Project1].[SourceSKU] AS [SourceSKU],
[Project1].[SourceCatalogId] AS [SourceCatalogId],
[Project1].[ManufacturerReference] AS [ManufacturerReference],
[Project1].[Disabled] AS [Disabled],
[Project1].[EAN] AS [EAN],
[Project1].[ShortDesignation] AS [ShortDesignation],
[Project1].[FullDesignation] AS [FullDesignation],
[Project1].[Description] AS [Description],
[Project1].[Url] AS [Url],
[Project1].[CategoryPath] AS [CategoryPath],
[Project1].[Condition] AS [Condition],
[Project1].[BuyingPriceHT] AS [BuyingPriceHT],
[Project1].[ShippingPriceHT] AS [ShippingPriceHT],
[Project1].[PublicSellingPriceHT] AS [PublicSellingPriceHT],
[Project1].[PictureUrl1] AS [PictureUrl1],
[Project1].[PictureUrl2] AS [PictureUrl2],
[Project1].[PictureUrl3] AS [PictureUrl3],
[Project1].[PictureUrl4] AS [PictureUrl4],
[Project1].[Quantity] AS [Quantity],
[Project1].[AddDate] AS [AddDate],
[Project1].[UpdateDate] AS [UpdateDate],
[Project1].[Followers] AS [Followers]
FROM ( SELECT [Project1].[SourceProductId] AS [SourceProductId], [Project1].[SourceSKU] AS [SourceSKU], [Project1].[SourceCatalogId] AS [SourceCatalogId], [Project1].[ManufacturerReference] AS [ManufacturerReference], [Project1].[Disabled] AS [Disabled], [Project1].[EAN] AS [EAN], [Project1].[ShortDesignation] AS [ShortDesignation], [Project1].[FullDesignation] AS [FullDesignation], [Project1].[Description] AS [Description], [Project1].[Url] AS [Url], [Project1].[CategoryPath] AS [CategoryPath], [Project1].[Condition] AS [Condition], [Project1].[BuyingPriceHT] AS [BuyingPriceHT], [Project1].[ShippingPriceHT] AS [ShippingPriceHT], [Project1].[PublicSellingPriceHT] AS [PublicSellingPriceHT], [Project1].[PictureUrl1] AS [PictureUrl1], [Project1].[PictureUrl2] AS [PictureUrl2], [Project1].[PictureUrl3] AS [PictureUrl3], [Project1].[PictureUrl4] AS [PictureUrl4], [Project1].[Quantity] AS [Quantity], [Project1].[AddDate] AS [AddDate], [Project1].[UpdateDate] AS [UpdateDate], [Project1].[Followers] AS [Followers], row_number() OVER (ORDER BY [Project1].[ShortDesignation] ASC) AS [row_number]
FROM ( SELECT
[Extent1].[SourceProductId] AS [SourceProductId],
[Extent1].[SourceSKU] AS [SourceSKU],
[Extent1].[SourceCatalogId] AS [SourceCatalogId],
[Extent1].[ManufacturerReference] AS [ManufacturerReference],
[Extent1].[Disabled] AS [Disabled],
[Extent1].[EAN] AS [EAN],
[Extent1].[ShortDesignation] AS [ShortDesignation],
[Extent1].[FullDesignation] AS [FullDesignation],
[Extent1].[Description] AS [Description],
[Extent1].[Url] AS [Url],
[Extent1].[CategoryPath] AS [CategoryPath],
[Extent1].[Condition] AS [Condition],
[Extent1].[BuyingPriceHT] AS [BuyingPriceHT],
[Extent1].[ShippingPriceHT] AS [ShippingPriceHT],
[Extent1].[PublicSellingPriceHT] AS [PublicSellingPriceHT],
[Extent1].[PictureUrl1] AS [PictureUrl1],
[Extent1].[PictureUrl2] AS [PictureUrl2],
[Extent1].[PictureUrl3] AS [PictureUrl3],
[Extent1].[PictureUrl4] AS [PictureUrl4],
[Extent1].[Quantity] AS [Quantity],
[Extent1].[AddDate] AS [AddDate],
[Extent1].[UpdateDate] AS [UpdateDate],
[Extent1].[Followers] AS [Followers]
FROM [dbo].[SourceProducts] AS [Extent1]
WHERE ([Extent1].[SourceCatalogId] = @p__linq__0) AND (0 = [Extent1].[Disabled]) AND ([Extent1].[CategoryPath] LIKE @p__linq__1 ESCAPE N''~'')
) AS [Project1]
) AS [Project1]
WHERE [Project1].[row_number] > 0
ORDER BY [Project1].[ShortDesignation] ASC',N'@p__linq__0 bigint,@p__linq__1 nvarchar(4000)',@p__linq__0=2,@p__linq__1=N'MyPath%'
В последната клауза преди where, ако премахна "escape N''~''" в:
WHERE ([Extent1].[SourceCatalogId] = @p__linq__0) AND (0 = [Extent1].[Disabled]) AND ([Extent1].[CategoryPath] LIKE @p__linq__1 ESCAPE N''~'')
заявката отнема 4s.
нормално ли е Индексът използва? Как мога да го реша със startWith?
РЕДАКТИРАНЕ
Индексен атрибут за categoryPath:
[Index("IX_SourceProduct_SourceCatalogId_Disabled_CategoryPath", 3), StringLength(400)]
public string CategoryPath { get; set; }
РЕДАКТИРАНЕ 2
Добре, смятам, че съм доста близо, мисля, че проблемът е съхранена процедура.
string search = "julien";
var list = db.Users.Where(x => x.Name.StartsWith(search));
string query = list.ToString();
=> SELECT [Extent1].[UserId] AS [UserId], [Extent1].[Name] AS [Name] FROM [dbo].[Users] AS [Extent1] WHERE [Extent1].[Name] LIKE @p__linq__0 < strong>ИЗБЯГВАНЕ N'~'
var list2 = db.Users.Where(x => x.Name.StartsWith("julien"));
string query2 = list2.ToString();
=> ИЗБЕРЕТЕ [Extent1].[UserId] AS [UserId], [Extent1].[Name] AS [Name] FROM [dbo].[Users] AS [Extent1] WHERE [Extent1].[Name] LIKE N'julien %'
Така че, ако използвам променлива в заявката за получаване на съхранена процедура, ако използвам const, получавам select.
В съхранената процедура (генерирана от обект) се появява @p__linq__0, така че добавете ESCAPE N'~', за да избегнете wildCaractere в променливата.
Така че сега въпросът е по-прост. Как да избегнете заявка с променлива? възможно е ? Благодаря
linq.StartsWith
, тъй като FTI изисква да използвате sql командатаCONTAINS
, което означава, че ще трябва да започнете да извиквате съхранени процедури. Но увеличението на скоростта си заслужава. Преминахме от 1m30s на ‹1s за заявка, която правехме. simple-talk .com/sql/learn-sql-server/ - person Mashton   schedule 19.09.2014