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Relational databases have been around now for more than 20 years. In their early days, performance problems were widespread due to limited hardware resources and immature optimizers, and so performance was a priority consideration. The situation is very different nowadays; hardware and software have advanced beyond all recognition. It’s hardly surprising that performance is now assumed to be able to take care of itself! But the reality is that despite the huge growth in resources, even greater growth has been seen in the amount of information that is now available and what needs to be done with this information. Additionally, one crucial aspect of the hardware has not kept pace with the times: Disks have certainly become larger and incredibly cheap, but they are still relatively slow with regards to their ability to directly access data. Consequently many of the old problems haven’t actually gone away—they have just changed their appearance. Some of these problems can have enormous implications— stories abound of “simple” queries that might have been expected to take a fraction of a second appear to be quite happy to take several minutes or even longer; this despite all the books that tell us how to code queries properly and how to organize the tables and what rules to follow to put the right columns into the indexes. So it is abundantly clear that there is a need for a book that goes beyond the usual boundaries and really starts to think about why so many people are still having so many problems today.
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2013-05-15 上传大小:7.46MB
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评论 共17条

svw0506 好用,谢谢分享
2017-08-28
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qq55579253 内容很好,感觉很坑的, 以为是完整版的pdf,都没有导航目录都没有,和网上随便下载的一个样
2017-07-15
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qqrh8820 经典之作,强烈推荐!
2016-04-13
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ppvqq 学习一下,看看有啥收获没有,多谢分享
2015-11-26
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download_destiny_ac 很赞的一本书,正在阅读中
2015-11-03
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xuefei2062 关系数据库的好教材
2015-07-31
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sculiunian 越读越新的书籍,值得一看
2015-07-15
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snelgar 关于索引理论的经典著作,强烈推荐开发人员仔细阅读
2015-06-11
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shuxiang1990 经典书籍,值得一读
2015-05-30
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a2660018 全英文 原汁原味 非常推荐
2015-05-13
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