Cause:
Setting log_archive_config to null in RAC standby database and Startup of node 2 fails with ORA-16188.
Alter system set log_archive_config='' scope=both sid='*'
Setting log_archive_config to null in RAC standby database and Startup of node 2 fails with ORA-16188.
Alter system set log_archive_config='' scope=both sid='*'
Solution:
This is due to v$dataguard_config not updated between instances.
To fix this do the below in any one of the nodes.
alter system set log_archive_config=NODG_CONFIG scope=both sid='*';
And retry the standby setup.