SQL优化工具Quest.Central.For.Databases—SQL Tuning

2022-09-13 00:00:00 语句 分析 数据库 优化 原始

随着企业数据库的急剧膨胀和日益复杂,DBA为保证数据库性能所付出的努力与日俱增,手工或使用多种无法集成的管理工具,都会给日常管理和维护带来不必要的困难。 Quest Central for Databases 是一种集成化、图形化、跨平台的数据库管理解决方案,可以管理异构环境下的 OracleDB2  SQL server 数据库。Quest Central for Databases 消除了企业IT人员管理多种数据库时面临的技术障碍,提高了IT人员工作效率,改善了数据库性能和数据库应用的可用性。为灵活满足用户的不同需求,Quest Central for Databases 采用了模块化产品架构。

该产品包括下列功能模块:

1.         数据库管理(DBA

2.         数据库监控(Monitoring Pack

3.         数据库诊断 (Spotlight Diagnostics)

4.         数据库分析 (Database Analysis)

5.         SQL优化 (SQL Tuning)

6.         空间管理 (Space Management)

7.         压力测试 (Load Generator)

8.         数据生成 (Data Generator)

9.         PL/SQL 开发 (TOAD)

10.     专家建议 (Knowledge Expert) 

今天主要介绍其中的SQL优化工具—— SQL Tuning for SQL Server

一、SQL Tuning for SQL Server简介

SQL语句的优化对发挥数据库的佳性能非常关键。然而不幸的是,应用优化通常由于时间和资源的因素而被忽略。SQL Tuning (SQL优化)模块可以对比和评测特定应用中SQL语句的运行性能,提出智能化的优化建议,帮助用户改善应用的响应时间。SQL优化模块具有非介入式SQL采集、自动优化和专家建议等功能,全面改善SQL优化工作。

       二、SQL Tuning for SQL Server的使用

      1、打开Quest Database Management Solutions弹出窗口如图1所示


       
      
                                                                          1  

    2、在红色标记处打开SQL Tuning 优化SQL    

  1)建立连接。

    Quest Central主界面上的“Database”树上选择“SQL Server”,然后在下方出现的“Tools”框中选择“SQL Tuning”选项,打开“Lanch SQL Tuning for SQL Server Connections”对话框(图2、图3)。我们在这里建立数据库服务器的连接,以后的分析工作都会在它上面完成。 

        


           

                                         “建立连接”对话框 

         


                  

                                         3

     双击“New Connection”图标,在弹出窗口中输入数据库的信息,单击“OK”,然后单击“Connect”即可。

   2)分析原始SQL语句 ,在单击“Connect”后将弹出一个新窗口,如图

        


     

                                                                  图4

     在打开窗口的“Oriangal SQL”文本框内输入需要分析的原始SQL语句,红色标记处选择对应的数据库名,SQL语句代码如下:   

原始SQL语句 

SELECT dbo.Person_BasicInfo.*, dbo.Graduater_GraduaterRegist.RegistNO AS RegistNO,       dbo.Graduater_GraduaterRegist.RegistTime AS BaoDaoTime,       dbo.Graduater_GraduaterRegist.RegistMan AS RegistMan,       dbo.Graduater_Business.ComeFrom AS ComeFrom,       dbo.Graduater_Business.Code AS Code, dbo.Graduater_Business.Status AS Status,       dbo.Graduater_Business.ApproveResult AS ApproveResult,       dbo.Graduater_Business.NewCorp AS NewCorp,       dbo.Graduater_Business.CommendNumber AS CommendNumber,       dbo.Graduater_Business.EmployStatus AS EmployStatus,       dbo.Graduater_Business.NewCommendTime AS NewCommendTime,       dbo.Graduater_Business.GetSource AS GetSource,       dbo.Graduater_Business.EmployTime AS EmployTime,       dbo.Graduater_Business.Job AS Job, dbo.Graduater_Business.FillMan AS FillMan,       dbo.Graduater_Business.FillTime AS FillTime,       dbo.Graduater_Business.IsCommendOK AS IsCommendOK,       dbo.Graduater_Business.ApproveUser AS ApproveUser,       dbo.Graduater_Business.ApproveTime AS ApproveTime,       dbo.Graduater_Business.RegistTime AS RegistTime,       dbo.Graduater_Business.EmployCorp AS EmployCorp,       dbo.Graduater_Business.JobRemark AS JobRemark,       CASE WHEN dbo.Graduater_Business.ComeFrom = 'WS' THEN '网上登记' WHEN dbo.Graduater_Business.ComeFrom       = 'HP' THEN '华普大厦' WHEN dbo.Graduater_Business.ComeFrom = 'JD' THEN '精典大厦'       WHEN dbo.Graduater_Business.ComeFrom = 'MC' THEN '赛马场' WHEN ComeFrom =       'ZX' THEN '高指中心' END AS ComeFromName,       dbo.Person_Contact.Address AS Address, dbo.Person_Contact.Zip AS Zip,       dbo.Person_Contact.Telephone AS Telephone, dbo.Person_Contact.Mobile AS Mobile,       dbo.Person_Contact.Email AS Email, dbo.Person_Contact.IM AS IM,       dbo.Person_Skill.ForeignLanguage AS ForeignLanguage,       dbo.Person_Skill.ForeignLanguageLevel AS ForeignLanguageLevel,       dbo.Person_Skill.CantoneseLevel AS CantoneseLevel,       dbo.Person_Skill.MandarinLevel AS MandarinLevel,       dbo.Person_Skill.Language AS Language,       dbo.Person_Skill.TechnicalTitle AS TechnicalTitle,       dbo.Person_Skill.ComputerLevel AS ComputerLevel,       dbo.Person_EmployPurpose.JobType AS JobType,       dbo.Person_EmployPurpose.Vocation AS Vocation,       dbo.Person_EmployPurpose.JobPlace AS JobPlace,       dbo.Person_EmployPurpose.Salary AS Salary,       dbo.Person_EmployPurpose.OnJobDate AS OnJobDate,       dbo.Person_EmployPurpose.CorpType AS CorpType,       dbo.Person_EmployPurpose.Job AS RequireJob, YEAR(GETDATE())       - YEAR(dbo.Person_BasicInfo.Birthday) AS Age,       dbo.Graduater_Business.EmployType AS EmployType,       dbo.Graduater_Business.EmployTypeCode AS EmployTypeCode,       dbo.Graduater_Business.EmployCorpType AS EmployCorpType,       CASE WHEN dbo.Graduater_Business.PrintStatus = '已打印' THEN '已打印' ELSE '未打印'       END AS PrintStatus, dbo.Graduater_Business.PrintTime AS PrintTime,       CASE WHEN dbo.Graduater_Business.EmployStatus = '是' THEN '已就业' ELSE '未就业'       END AS EmployStatusViewFROM dbo.Person_BasicInfo INNER JOIN      dbo.Graduater_Business ON       dbo.Person_BasicInfo.PersonID = dbo.Graduater_Business.PersonID LEFT OUTER JOIN      dbo.Graduater_GraduaterRegist ON       dbo.Graduater_Business.GradBusinessID = dbo.Graduater_GraduaterRegist.GraduaterGUID       INNER JOIN      dbo.Person_Contact ON       dbo.Person_BasicInfo.PersonID = dbo.Person_Contact.PersonID INNER JOIN      dbo.Person_Skill ON       dbo.Person_BasicInfo.PersonID = dbo.Person_Skill.PersonID INNER JOIN      dbo.Person_EmployPurpose ON       dbo.Person_BasicInfo.PersonID = dbo.Person_EmployPurpose.PersonID


   然后点击工具栏上的“Execute”按钮,执行原始的SQL语句,SQL Tuning会自动分析SQL的执行计划,并把分析结果显示到界面上(图5)。         


           
                       
                       分析原始SQL语句

   (3)优化SQL

   现在我们点击工具栏上的“Optimize Statement”按钮,SQL Tuning开始优化SQL,完成后,可以看到SQL Tuning产生了19条与原始SQL等价的优化方案(图6)。 

       


   

                                                        6 SQL优化方案 

 (4)获得优SQL

     接下来,我们来执行上面产生的优化方案,以选出性能佳的等效SQL语句。在列表中选择需要执行的优化方案(默认已全部选中),然后点击工具栏上的“Execute”按钮旁边的下拉菜单,选择“Execute Selected”。等到所有SQL运行完成后,点击界面左方的“Tuning Resolution”按钮,
可以看到优的
SQL已经出来啦,运行时间竟然可以提高21%!(图7 

       


    

                                            Tuning Resolution”界面 

     优的SQL语句如下:  

优化后的SQL语句 

SELECT dbo.Person_BasicInfo.*,        dbo.Graduater_GraduaterRegist.RegistNO AS RegistNO,        dbo.Graduater_GraduaterRegist.RegistTime AS BaoDaoTime,        dbo.Graduater_GraduaterRegist.RegistMan AS RegistMan,        dbo.Graduater_Business.ComeFrom AS ComeFrom,        dbo.Graduater_Business.Code AS Code,        dbo.Graduater_Business.Status AS Status,        dbo.Graduater_Business.ApproveResult AS ApproveResult,        dbo.Graduater_Business.NewCorp AS NewCorp,        dbo.Graduater_Business.CommendNumber AS CommendNumber,        dbo.Graduater_Business.EmployStatus AS EmployStatus,        dbo.Graduater_Business.NewCommendTime AS NewCommendTime,        dbo.Graduater_Business.GetSource AS GetSource,        dbo.Graduater_Business.EmployTime AS EmployTime,        dbo.Graduater_Business.Job AS Job,        dbo.Graduater_Business.FillMan AS FillMan,        dbo.Graduater_Business.FillTime AS FillTime,        dbo.Graduater_Business.IsCommendOK AS IsCommendOK,        dbo.Graduater_Business.ApproveUser AS ApproveUser,        dbo.Graduater_Business.ApproveTime AS ApproveTime,        dbo.Graduater_Business.RegistTime AS RegistTime,        dbo.Graduater_Business.EmployCorp AS EmployCorp,        dbo.Graduater_Business.JobRemark AS JobRemark,        CASE WHEN dbo.Graduater_Business.ComeFrom = 'WS' THEN '网上登记'             WHEN dbo.Graduater_Business.ComeFrom = 'HP' THEN '华普大厦'             WHEN dbo.Graduater_Business.ComeFrom = 'JD' THEN '精典大厦'             WHEN dbo.Graduater_Business.ComeFrom = 'MC' THEN '赛马场'             WHEN ComeFrom = 'ZX' THEN '高指中心' END AS ComeFromName,        dbo.Person_Contact.Address AS Address,        dbo.Person_Contact.Zip AS Zip,        dbo.Person_Contact.Telephone AS Telephone,        dbo.Person_Contact.Mobile AS Mobile,        dbo.Person_Contact.Email AS Email,        dbo.Person_Contact.IM AS IM,        dbo.Person_Skill.ForeignLanguage AS ForeignLanguage,        dbo.Person_Skill.ForeignLanguageLevel AS ForeignLanguageLevel,        dbo.Person_Skill.CantoneseLevel AS CantoneseLevel,        dbo.Person_Skill.MandarinLevel AS MandarinLevel,        dbo.Person_Skill.Language AS Language,        dbo.Person_Skill.TechnicalTitle AS TechnicalTitle,        dbo.Person_Skill.ComputerLevel AS ComputerLevel,        dbo.Person_EmployPurpose.JobType AS JobType,        dbo.Person_EmployPurpose.Vocation AS Vocation,        dbo.Person_EmployPurpose.JobPlace AS JobPlace,        dbo.Person_EmployPurpose.Salary AS Salary,        dbo.Person_EmployPurpose.OnJobDate AS OnJobDate,        dbo.Person_EmployPurpose.CorpType AS CorpType,        dbo.Person_EmployPurpose.Job AS RequireJob,        YEAR(GETDATE()) - YEAR(dbo.Person_BasicInfo.Birthday) AS Age,        dbo.Graduater_Business.EmployType AS EmployType,        dbo.Graduater_Business.EmployTypeCode AS EmployTypeCode,        dbo.Graduater_Business.EmployCorpType AS EmployCorpType,        CASE WHEN dbo.Graduater_Business.PrintStatus = '已打印' THEN '已打印'             ELSE '未打印' END AS PrintStatus,        dbo.Graduater_Business.PrintTime AS PrintTime,        CASE WHEN dbo.Graduater_Business.EmployStatus = '是' THEN '已就业'             ELSE '未就业' END AS EmployStatusView   FROM dbo.Person_BasicInfo        INNER JOIN dbo.Graduater_Business           ON dbo.Person_BasicInfo.PersonID = dbo.Graduater_Business.PersonID        LEFT OUTER JOIN dbo.Graduater_GraduaterRegist          ON dbo.Graduater_Business.GradBusinessID = dbo.Graduater_GraduaterRegist.GraduaterGUID        INNER JOIN dbo.Person_Contact           ON dbo.Person_BasicInfo.PersonID = dbo.Person_Contact.PersonID        INNER JOIN dbo.Person_Skill           ON dbo.Person_BasicInfo.PersonID = dbo.Person_Skill.PersonID        INNER JOIN dbo.Person_EmployPurpose           ON dbo.Person_BasicInfo.PersonID = dbo.Person_EmployPurpose.PersonID OPTION (FORCE ORDER)


 

 (5)学习书写专家级的SQL语句 

    通过上面的步骤,我们已经可以实现自动优化SQL语句,但更重要的是,我们还可以学习如何书写这样高性能的SQL语句。点击界面左方的“Compare Scenarios”按钮,我们可以比较优化方案和原始SQL中的任意2SQL语句,SQL Tuning会将它们之间的不同之处以不同颜色表示出来,
还可以在下方的“执行计划”中,通过比较两条
SQL语句的执行计划的不同,来了解其中的差异(图8)。 

       


     

                                      图Compare Scenarios”界面

   三、总结

    SQL Tuning等人工智能自动SQL优化工具的出现,为我们节省出大量的时间和精力。借助这些工具的帮助,书写专家级的SQL语句将不再是难事。

   Quest.Central.For.Databases下载地址:
   http://58.251.57.206/down?cid=1669258673&t=14&fmt=&usrinput=Quest.Central&dt=0&ps=0_0&rt=0kbs&plt=0&spd=9

   SQL Tuning操作手册英文版:

   https://files.cnblogs.com/dreamof/SQL.Tuning.rar

 
    注意:该软件试用期只有7天,我这里有注册机,需要的请留Email,到时统一发送!


本文来源https://www.cnblogs.com/dreamof/archive/2010/04/29/1724205.html

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