Cost-Based Oracle Fundamentals
来源:互联网 发布:linux pptp server 编辑:程序博客网 时间:2024/06/07 03:09
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 statistics can't be perfect, and the resulting execution plan may be far from perfect.
In Cost-Based Oracle Fundamentals, the first book in a series of three, Jonathan Lewis--one of the foremost authorities in this field--describes the most commonly used parts of the model, what the optimizer does with your statistics, and why things go wrong. With this information, you'll be in a position to fix entire problem areas, not just single SQL statements, by adjusting the model or creating more truthful statistics
http://rapidshare.com/files/52645902/1590596366.zip
- Cost-Based Oracle Fundamentals
- Cost-Based Oracle - Fundamentals: Test cases applied against 10.2.0.4 and 11.1.0.6 (Part 2)
- Location-based Services : Fundamentals and Operation
- Cost Based Optimizer (CBO) and Database Statistics
- Cost Based Optimizer - Common Misconceptions and Issues
- Cost Based Optimizer in Apache Spark 2.2
- Experimental Evaluation of FSM-Based Testing Cost——1
- Experimental Evaluation of FSM-Based Testing Cost——2
- HIVE 0.14 Cost Based Optimizer (CBO) Technical Overview
- Oracle 9i DBA Fundamentals I
- oracle 笔记1(Fundamentals II)
- oracle 笔记2(Fundamentals II)
- oracle 笔记3(Fundamentals II)
- oracle 笔记4(Fundamentals II)
- oracle 笔记5(Fundamentals II)
- oracle 笔记6(Fundamentals II)
- oracle 笔记7(Fundamentals II)
- oracle 笔记8(Fundamentals II)
- 启用Tomcat6的隐藏Gzip压缩功能
- IO端口,io内存, 物理地址, 虚拟地址[转]
- Home Network Basis: Transmission Environments and Wired/Wireless Protocols
- oracle关于存在性的判断
- Managing Information Security Risks: The OCTAVE Approach
- Cost-Based Oracle Fundamentals
- Pure Java Server Pages
- DB2(R) for z/OS(R) Version 8 DBA Certification Guide
- MySQL Crash Course
- Wireless Programming with J2ME: Cracking the Code
- 让VB生成的DLL工程导出函数
- Java 2 Micro Edition
- Core SWING advanced programming
- Mobile messaging technologies and services: SMS, EMS and MMS