Preface I wrote this book to provide you with the necessary knowledge with which to accomplish business objectives with DB2 UDB v8.1 for Windows, UNIX, and Linux. After all, as a developer or DBA, your primary mission is to accomplish business objectives by providing a database environment that provides the requisite performance, availability, and scalability required in today's demanding 24 7 highly competitive business environment. To that end, I have focused this book on key areas of DB2 UDB v8.1 that will enable you to meet those objectives. Some of the features covered are: the new Development Center, multidimensional clustering, online reorganization and online load, Type-2 indexes, tablespace enhancements, block-based bufferpools, tuning bufferpools, new commands and utility options, dynamic configuration parameters, autonomic computing features, write-to-table event monitors, SQL snapshot functions, QUIESCE command, and the database partitioning feature with new partitioning terminology updates. And, almost all new DB2 UDB v8.1 features and enhancements are covered in this book. Also, I have included a chapter on logical and physical design to help you in designing top performing databases. In the following chapters, I will show you how to design, maintain, monitor, and tune high performing DB2 UDB v8.1 databases. If, after you read this book, I have helped you do that, then I have accomplished my mission. Acknowledgments I have had a lot of help in writing this book. I would like to thank the following people from Prentice Hall: Mike Meehan, for helping me get started on this book; Jeff Pepper, for continued support and patience; Scott Suckling, for producing the final manuscript; and all the people behind the scenes in the marketing and publication of this book. Without the support of IBM it would have been difficult to write this book. Special thanks to Susan Visser for her patience and positive attitude and for providing access to DB2 Developers and technical writers. I also want to thank Brad Cassells for providing technical assistance and clarification when needed. I also want to thank my reviewers: Bob Harbus, who did a yeoman's job reviewing the book while on the road; Sam Lightstone; and Dwaine Snow, who rearranged his schedule to review Chapter 13. I also want to thank Scott Hayes for providing some of the material for Chapter 8, and to Martin Hubel, who dropped what he was doing to review Chapter 10, 11, and 12. Thanks to my mentor, Doug French, who took me under his wing many years ago; and to Polly Mathys, Professor of Information Systems at Alvernia College, for her outstanding teaching ability, and for setting the example for all to emulate. Of course, although I have tried to be as accurate and complete as possible, any errors are strictly my own. I also want to thank my fellow IDUG North America Conference Planning Committee members who put up with me over the last year and a half! To my wife, who's constant support and encouragement were instrumental to the completion of the book. And finally, to my daughters Paula and Katie, who helped a lot with keyboarding and completing my drawings, tables, and examples. They finally have their Dad back! Philip K. Gunning Sinking Spring, Pennsylvania June 2003 pgunning@gunningts.com www.gunningts.com
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我花了大量的篇幅研究了书中关于性能调优的那几个章节,坦白讲,内容的新颖度和深度实在是令人大失所望。在那个年代,DB2 V8 已经开始引入了不少面向企业级应用的高级特性,比如更精细的内存管理和查询优化器策略的革新,但这本书对这些关键点的阐述却停留在非常表层、甚至有些过时的知识点上。举个例子,它详尽地描述了如何通过调整一些基础的配置文件参数来应对高并发,但对于如何利用新的动态缓存管理机制进行预测性优化,几乎是一笔带过。我试图寻找一些针对特定复杂业务场景(比如OLTP与OLAP混合负载下的锁竞争问题)的实战案例,结果找到的却是大量教科书式的SQL语句解释,这些内容在官方的联机帮助文档里能免费查到,而且更加实时和准确。我购买这本书的初衷,是想通过一位资深专家的视角,学习如何避开那些“踩坑”的地方,掌握那些非官方渠道难以获取的“独门秘籍”。然而,这本书更像是一个对DB2 V8所有基础命令和语法的“事无巨细”的罗列,缺乏批判性思维和实际操作中的权衡取舍。读完这些部分,我感觉自己只是多记了几十条命令,但对于如何“治病救人”的经验总结,几乎为零,性价比极低。
评分本书的语言风格和作者的叙事方式,让我感觉像是在听一位知识渊博但极度缺乏幽默感的老教授进行冗长冗长的午餐演讲。大量的被动语态和晦涩的专业术语堆砌,使得本应是严肃的技术指导,读起来却像在攻读一篇没有尽头的法律条文。特别是在解释事务隔离级别和锁定机制时,作者似乎沉迷于使用极其抽象的数学模型和理论推导,而不是提供直观的图解或实际的死锁场景演示。我尝试带着一个初级DBA的心态去理解这些内容,结果是不断地需要在页边空白处画出流程图来自我救赎。更让我感到困惑的是,书中对于错误代码和异常处理的描述,往往是“当出现SQLCODE -XXX时,请检查Y”,这种简单的映射关系,并没有深入分析造成该错误背后的数据库内部状态变化,这对于需要快速定位和解决生产环境中突发故障的工程师来说,帮助有限。我想象中的手册,应该是那种能够让你在凌晨三点被电话吵醒时,能迅速翻到对应章节,直击病灶的工具书,而不是一本需要你带着荧光笔和笔记本,全神贯注、逐字逐句精读才能勉强理解的学术著作。
评分关于在Windows和UNIX/Linux环境下进行安装和配置的部分,这本书的描述简直是灾难性的不一致,完全没有体现出“for Windows and UNIX/Linux”这个副标题应有的专业水准。它似乎采取了一种最省事的处理方式:先写一份针对UNIX/Linux的步骤,然后简单地在关键地方加上一句“在Windows上,请使用对应的图形界面工具进行操作”,完全没有深入探讨两种操作系统底层架构差异带来的实际配置影响。例如,在用户权限管理和文件系统路径的约定上,两者有着天壤之别,但书中对于Windows用户权限的复杂性,特别是Active Directory集成时的安全上下文切换问题,处理得过于草率。反观Linux/UNIX部分,虽然步骤相对完整,但对于SELinux或AppArmor在数据库安全强化方面的考量也付之阙如。我最终发现,很多关键步骤——比如如何确保跨平台的数据一致性校验——我还是得依赖于我多年积累的模糊记忆和最新的社区论坛帖子来验证。这本书未能成功地架设起一座沟通异构操作系统的有效桥梁,它更像是一份“两边都沾点边的”拼凑材料,让人在实际操作中左右为难,耗费了大量时间在系统兼容性调试上,而不是数据库本身的业务逻辑实现。
评分我想特别指出书中关于数据库管理工具集(如DB2 Control Center)的使用说明,这部分内容的过时程度几乎令人发指。虽然这本书是针对V8版本的,但它对图形化界面的描述,明显是基于更早期的版本逻辑,很多关键功能的菜单路径描述和实际界面元素已经对不上号。例如,书中详细介绍了一个在Control Center特定菜单下进行的自动化备份配置流程,但当我打开我正在使用的V8环境时,那个菜单项已经不存在了,或者功能被迁移到了一个全新的管理视图中。这直接导致我在尝试复现书中的“最佳实践”时,反而被引导向了错误的配置路径,浪费了大量时间来确认是否是自己的环境配置出了问题,而非书本内容本身存在偏差。对于任何依赖工具进行日常维护的管理员而言,过时的界面描述不仅是信息冗余,更是一种潜在的误导,它破坏了读者对作者专业性的基本信任。一本技术手册的生命周期管理至关重要,如果连其描述的工具界面都无法与实际产品同步,那么其作为实践指南的价值也就大打折扣了。
评分这本书的封面设计简直是一场视觉的灾难,那种上世纪末的“科技感”扑面而来,厚重的蓝色调,配上像素感十足的字体,让人不禁怀疑自己是不是误入了某个古董软件经销商的仓库。我原本对接下来的技术内容抱有极大的期待,毕竟这是关于DB2 UDB的权威指南,但翻开扉页的那一刻,我的心情就像是期待吃到米其林三星,结果端上来的是一盘冷掉的食堂盒饭。更糟的是,内页的排版简直是反人类工程学的杰作,页边距窄得可怜,正文塞得满满当当,仿佛作者生怕少写一个字节都会被追责似的。阅读体验极其差,每翻几页我就得停下来揉眼睛,这哪里是手册,分明是考验读者视力的健眼操指南。我花了整整一个下午,试图从目录中梳理出我对V8版本新特性的了解脉络,结果发现结构混乱,章节之间的逻辑跳跃性极大,像是一堆零散的技术文档被强行拼贴在一起,缺乏一位优秀编辑应有的梳理和提炼能力。说实话,如果光看这外表和初步的排版,我甚至不敢相信这真的能指导我完成复杂的数据库部署和优化工作,它更像是一个匆忙赶工的内部培训资料,而不是面向全球专业人士的“圣经”。我更希望看到的是清晰的图表、合理的留白和引导性的文字,而不是这种密密麻麻、令人望而生畏的文本堆砌。
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