[转载]Quest.Central.For.Databases——SQL Tuning for SQL Server

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[转载]【推荐】[SQL优化工具]Quest.Central.For.Databases——SQL Tuning for SQL Server – Beyond the dream——飛雪飄寒 – 博客园.

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

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。

2 “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4

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 = 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

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)。

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

7 Tuning Resolution”界面

最优的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 = 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)。

8 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:

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

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