| 书目名称 | Cost-Based Oracle Fundamentals | | 编辑 | Jonathan Lewis | | 视频video | | | 概述 | Jonathan Lewis is one of the world‘s foremost authorities in this field (he is frequently quoted and reference by other leading experts, such as Tom Kyte – see for example http://asktom.oracle.com/pls | | 图书封面 |  | | 描述 | .The question, "Why isn‘t Oracle using my index?" must be one of the most popular (or perhaps unpopular) questions ever asked on the Oracle help forums. You‘ve picked exactly the right columns, you‘ve got them in the ideal order, you‘ve computed statistics, you‘ve checked for null columns—and the optimizer flatly refuses to use your index unless you hint it. What could possibly be going wrong?..If you‘ve suffered the frustration of watching the optimizer do something completely bizarre when the best execution plan is totally obvious, or spent hours or days trying to make the optimizer do what you want it to do, then this is the book you need. You‘ll come to know how the optimizer thinks, understand why it makes mistakes, and recognize the data patterns that make it go awry. With this information at your fingertips, you will save an enormous amount of time on designing and trouble-shooting your SQL...The cost-based optimizer is simply a piece of code that contains a model of how Oracle databases work. By applying this model to the statistics about your data, the optimizer tries to efficiently convert your query into an executable plan. Unfortunately, the model can‘t be perfect, your | | 出版日期 | Book 2006 | | 关键词 | Oracle; SQL; architecture; databases; design | | 版次 | 1 | | doi | https://doi.org/10.1007/978-1-4302-0087-1 | | isbn_softcover | 978-1-59059-636-4 | | isbn_ebook | 978-1-4302-0087-1 | | copyright | Jonathan Lewis 2006 |
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发表于 2025-3-21 18:25:37
