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Oracle SQL tuning 数据库优化步骤图文教程

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Release: 2016-06-07 16:20:00
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SQL Turning 是Quest公司出品的Quest Central软件中的一个工具。Quest Central是一款集成化、图形化、跨平台的数据库管理解决方案,可以同时管理 Oracle、DB2 和 SQL server 数据库。 一、SQL Tuning for SQL Server简介 SQL语句的优化对发挥数据库的最佳性

   SQL Turning 是Quest公司出品的Quest Central软件中的一个工具。Quest Central是一款集成化、图形化、跨平台的数据库管理解决方案,可以同时管理 Oracle、DB2 和 SQL server 数据库。

  一、SQL Tuning for SQL Server简介

  SQL语句的优化对发挥数据库的最佳性能非常关键。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

Oracle SQL tuning 数据库优化步骤图文教程 三联

  图1

  2、在红色标记处打开SQL Tuning 优化SQL

  (1)建立连接。

  在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。

Oracle SQL tuning 数据库优化步骤图文教程

  图2 “建立连接”对话框

Oracle SQL tuning 数据库优化步骤图文教程

  图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4

Oracle SQL tuning 数据库优化步骤图文教程

  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:

  图5 分析原始SQL语句

  原始SQL语句

  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)。

Oracle SQL tuning 数据库优化步骤图文教程

  (3)优化SQL。

  现在我们点击工具栏上的“Optimize Statement”按钮,让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)。

Oracle SQL tuning 数据库优化步骤图文教程

  图6 SQL优化方案

  (4)获得最优SQL。

  接下来,我们来执行上面产生的优化方案,以选出性能最佳的等效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,

  可以看到最优的SQL已经出来啦,运行时间竟然可以提高21%!(图7)

Oracle SQL tuning 数据库优化步骤图文教程

  图7 “Tuning Resolution”界面

  最优的SQL语句如下:

  5)学习书写专家级的SQL语句 。

  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)

  (

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