ORACLE--逻辑架构(一)http://blog.youkuaiyun.com/xieyuooo/archive/2010/07/30/5775322.aspx
ORACLE--逻辑架构(二)http://blog.youkuaiyun.com/xieyuooo/archive/2010/08/11/5804019.aspx
ORACLE--逻辑架构(二)http://blog.youkuaiyun.com/xieyuooo/archive/2010/08/11/5804019.aspx