11gR2中awr 相关脚本的说明详见原文博客链接 http://www.killdb.com/2012/08/08/11gr2%e4%b8%adawr-%e7%9b%b8%e5%85%b3%e8%84%9a%e6%9c%ac%e7%9a%84%e8%af%b4%e6%98%8e.html
