好的oracle 博客

 

http://blog.youkuaiyun.com/BOBO12082119/article/category/758446/2

http://blog.youkuaiyun.com/tanyit/article/details/6937366

http://yangtingkun.itpub.net/post/468/273645

http://www.5ienet.com/note/html/dg/dataguard-basic-how-dataguard-work.shtml

http://docs.oracle.com/cd/B28359_01/server.111/b28320/dynviews_1007.htm