程序執行時間太長

Question

我正在使用存儲過程來獲取數據。 我在其中使用多個聯接和內部查詢，這是使其過慢的原因。 是否有其他選擇可以避免對主明細表的內部查詢？

實際上，我早些時候使用LINQ查詢來獲取數據，但執行時間太長，因此我選擇了存儲過程，但執行時間也相同。 那么我怎樣才能使其更快呢？

這是我的存儲過程：

ALTER PROCEDURE USP_GetUserDetailByID 
    @id INT
AS
BEGIN
    SELECT TOP 1
        uinfo.ID ID,
        uinfo.UniqueUserID UniqueUserID,
        uinfo.ID UserInfoID,
        uinfo.ReferredID ReferredID,
        uinfo.UserTypeID UserTypeID,
        uinfo.GroomBrideName GroomBrideName,
        uinfo.EmailID EmailID,
        uinfo.[Password] [Password], 
        uinfo.ProfileCreatedFor ProfileCreatedFor,
        uinfo.DateOfBirth DateOfBirth,
        uinfo.Gender Gender,
        uinfo.Age Age,
        uinfo.Height Height,
        uinfo.City City,
        uinfo.Country Country,
        uinfo.Phone Phone,
        uinfo.Mobile Mobile,
        uinfo.RegisteredMobileNumber RegisteredMobileNumber,
        uinfo.About About,
        uinfo.[Status] [Status],
        rel.Religion Religion,
        rel.MotherTongue MotherTongue,
        rel.Section Section,
        rel.Division Division,
        edu.EducationLevel EducationalLevel,
        edu.EducationFeild EducationalField,
        edu.GraduationDegree GraduationDegree,
        edu.MasterDegree MasterDegree,
        edu.WorkWith WorkWith,
        edu.WorkingGroup WorkingGroup,
        edu.WorkingAs WorkingAs,
        edu.AnnualIncome AnnualIncome,
        edu.InterestedInSettlingAbroad InsertedInSettingAbroad,
        hob.Hobbies Hobbies,
        hob.DressStyle,
        hob.SportsFitness SportsFitness,
        hob.FavouriteCuisine FavouriteCuisine,
        hob.FavouriteVacationDestination FavouriteVacationDestination,
        hob.FavouriteMusic FavouriteMusic,
        hob.FavouriteBooks FavouriteBooks,
        hob.PreferredMovies PreferredMovies,
        life.Diet Diet,
        life.Smoke Smoke,
        life.Drink Drink,
        life.SkinTone Complexion,
        life.BodyType BodyType,
        life.BloodGroup BloodGroup,
        life.[Weight] [Weight],
        life.ResidentialStatus ResidentialStatus,
        life.OwnHouse OwnHouse,
        life.OwnCar OwnCar,
        life.LanguageKnown LanguageKnown,
        fd.FamilyValue FamilyValue,
        (SELECT DetailData FROM MasterDetails WHERE ID = fd.FamilyValue) FamilyValueText,
        fd.FamilyType FamilyType,
        (SELECT DetailData FROM MasterDetails WHERE ID = fd.FamilyType) FamilyTypeText,
        fd.FamilyStatus FamilyStatus,
        (SELECT DetailData FROM MasterDetails WHERE ID = fd.FamilyStatus) FamilyStatusText,
        fd.Father Father,
        (SELECT DetailData FROM MasterDetails WHERE ID = fd.Father) FatherText,
        fd.Mother Mother,
        (SELECT DetailData FROM MasterDetails WHERE ID = fd.Mother) MotherText,
        fd.Brothers Brothers,
        fd.MarriedBrothers MarriedBrothers,
        fd.Sisters Sisters,
        fd.MarriedSisters MarriedSisters,
        fd.LivingWithParents LivingWithParents,
        rel.ReligiousValues ReligiousValues,
        uinfo.HightLightUserAbout HightLightUserAbout,
        uinfo.FbUserDetail FbUserDetail,
        (SELECT DetailData FROM  MasterDetails WHERE ID = uinfo.ProfileCreatedFor) ProfileCreatedText,
        (SELECT DetailData FROM  MasterDetails WHERE ID = uinfo.Height) HeightText,
        (SELECT ID FROM MasterDetails WHERE ID =  uinfo.MaritalStatus) MaritalStatus,
        (SELECT DetailData FROM  MasterDetails WHERE ID = uinfo.MaritalStatus) MaritalStatusText,
        (SELECT ID FROM MasterDetails WHERE ID = uinfo.[State]) [State],
        CASE WHEN uinfo.City IS NULL THEN '' ELSE (SELECT DetailData FROM MasterDetails WHERE ID = uinfo.City) END as CityText,
        CASE WHEN uinfo.[State] IS NULL THEN '' ELSE (SELECT DetailData FROM MasterDetails WHERE ID = uinfo.[State]) END as StateText,
        (SELECT MasterCategoryID FROM MasterDetails WHERE ID = uinfo.Country) CountryId,
        (SELECT DetailData FROM MasterDetails WHERE ID = uinfo.Country) CountryText,
        (SELECT DetailData FROM MasterDetails WHERE ID = rel.MotherTongue) MotherTongueText,
        (SELECT DetailData FROM MasterDetails WHERE ID = rel.Section) SectionText,
        (SELECT DetailData FROM MasterDetails WHERE ID = rel.Division) DivisonText,
        (SELECT DetailData FROM MasterDetails WHERE ID = edu.EducationLevel) EducationalLevelText,
        (SELECT DetailData FROM MasterDetails WHERE ID = edu.EducationFeild) EducationalFeildText,
        (SELECT DetailData FROM MasterDetails WHERE ID = edu.GraduationDegree) GraduationDegreeText,
        (SELECT DetailData FROM MasterDetails WHERE ID = edu.MasterDegree) MasterDegreeText,
        (SELECT DetailData FROM MasterDetails WHERE ID = edu.WorkWith) WOrkingWithText,
        (SELECT DetailData FROM MasterDetails WHERE ID = edu.WorkingGroup) WorkingGroupText,
        (SELECT DetailData FROM MasterDetails WHERE ID = edu.WorkingAs) WorkingAsText,
        (SELECT DetailData FROM MasterDetails WHERE ID = edu.AnnualIncome) AnnualIncomeText,
        (SELECT DetailData FROM MasterDetails WHERE ID = hob.Hobbies) HobbiesText,
        (SELECT DetailData FROM MasterDetails WHERE ID = hob.DressStyle) DressStyleText,
        (SELECT DetailData FROM MasterDetails WHERE ID = hob.SportsFitness) SportsFitnessText,
        (SELECT DetailData FROM MasterDetails WHERE ID = hob.FavouriteCuisine) FavouriteCuisineText,
        (SELECT DetailData FROM MasterDetails WHERE ID = hob.FavouriteMusic) FavouriteMusicText,
        (SELECT DetailData FROM MasterDetails WHERE ID = hob.PreferredMovies) PreferredMoviesText,
        (SELECT DetailData FROM MasterDetails WHERE ID = life.Diet) DietText,
        (SELECT DetailData FROM MasterDetails WHERE ID = life.SkinTone) ComplexionText,
        (SELECT DetailData FROM MasterDetails WHERE ID = life.BodyType) BodyTypeText
    FROM
        UsersInfo uinfo 
    LEFT JOIN 
        EducationAndOccupation edu on uinfo.ID = edu.UserID 
    LEFT JOIN 
        ReligionAndEthinicity rel on uinfo.ID = rel.UserID
    LEFT JOIN 
        HobbiesAndInterests hob on uinfo.ID = hob.UserID
    LEFT JOIN 
        LifestyleAndAttributes life on uinfo.ID = life.UserID
    LEFT JOIN 
        FamilyDetails fd on uinfo.ID = fd.UserID
    WHERE
        uinfo.ID = @id
END

Answer 1

您應該做的第一件事是通過EXPLAIN運行該語句以查看您的查詢正在做什么。

在SSMS中，確保已選擇數據庫並打開一個新的查詢窗口。 將您的SQL粘貼到窗口中，然后選擇“查詢”->“顯示估計的執行計划（Ctrl + L）”

查詢計划顯示在底部的窗口中。 查看計划，它會告訴您時間在哪里（相對於批次的百分比）。如果您不熟悉計划，請在此處查看...

http://www.simple-talk.com/sql/performance/execution-plan-basics/ [ ^]

您也可以通過優化顧問運行查詢，以查看是否建議使用任何索引。 但是，如果表titlefee是記錄最多的表，則需要考慮對其執行的操作。

1）您要通過字段dtIssue限制此表的結果。 該字段是索引的一部分，還是引起表掃描（在執行計划中查看）

2）您正在按字段curAmount進行匯總-可能會對其進行索引。

使用執行計划+查詢調整顧問，您應該能夠索引表以獲得最佳性能。

但是，通過引入索引，您必須權衡表的更新頻率\\更新數據的過程（例如，用戶應用程序？一夜ETL？）。 獲得READ與WRITE性能之間的正確平衡可能有點困難

參考： 如何快速存儲過程

Answer 2

嘗試為您的查詢執行計划，這將使您花費更多的成本，並且在需要時還會建議索引。