程序执行时间太长

Question

我正在使用存储过程来获取数据。 我在其中使用多个联接和内部查询，这是使其过慢的原因。 是否有其他选择可以避免对主明细表的内部查询？

实际上，我早些时候使用LINQ查询来获取数据，但执行时间太长，因此我选择了存储过程，但执行时间也相同。 那么我怎样才能使其更快呢？

这是我的存储过程：

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

您应该做的第一件事是通过EXPLAIN运行该语句以查看您的查询正在做什么。

在SSMS中，确保已选择数据库并打开一个新的查询窗口。 将您的SQL粘贴到窗口中，然后选择“查询”->“显示估计的执行计划（Ctrl + L）”

查询计划显示在底部的窗口中。 查看计划，它会告诉您时间在哪里（相对于批次的百分比）。如果您不熟悉计划，请在此处查看...

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

您也可以通过优化顾问运行查询，以查看是否建议使用任何索引。 但是，如果表titlefee是记录最多的表，则需要考虑对其执行的操作。

1）您要通过字段dtIssue限制此表的结果。 该字段是索引的一部分，还是引起表扫描（在执行计划中查看）

2）您正在按字段curAmount进行汇总-可能会对其进行索引。

使用执行计划+查询调整顾问，您应该能够索引表以获得最佳性能。

但是，通过引入索引，您必须权衡表的更新频率\\更新数据的过程（例如，用户应用程序？一夜ETL？）。 获得READ与WRITE性能之间的正确平衡可能有点困难

参考： 如何快速存储过程

Answer 2

尝试为您的查询执行计划，这将使您花费更多的成本，并且在需要时还会建议索引。