10g、11g性能管理方面提供哪些新特性.
昨天的执行效率很高，突然今天的性能就下降(有可能昨天的执行计划于今天的执行不同导致的).
被动监控与主动监控.大火燃烧了，大火还没有蔓延.
Objectives
After completing this lesson,you should be able to :
- Use Enterprise Manager to monitor performance
- Use Automatic Memory Management(AMM)
- Use the Memory Advisor to size memory buffers
- View performance-related dynamic views
- Troubleshoot invalid and unuseable objects
Performance Monitorying
Oracle的性能监控，主要查看如下几个要素;平时的工作，主要就是围绕着下述几个问题来研究.
- Memory allocation issues
- Input/Output device contention
- Application code problems
- Resour5ce contention
- Network bottlenecks
Enterprise Manager Performance Page
Drilling Down to a Particular Wait Category
追根溯源
