If you have real-time apply enabled, any delay that you set will be ignored.
http://docs.oracle.com/cd/E11882_01/server.112/e41134/log_arch_dest_param.htm#SBYDB01105
本文出自 “harryzhang” 博客，谢绝转载！
Oracle Database 11.2下DG下参数delay与realtime apply特性冲突
原文：http://harryzhang.blog.51cto.com/10795906/1707449