ORA-03113: end-of-file on communication channel

After doing a package install the 2 node RAC database running on 11.1.0.7.0 was brought up .One instance came up fine but the other instance was not coming up and throwing the following error.

ORA-03113: end-of-file on communication channel
Process ID: 20194
Session ID: 1655 Serial number: 5

WARNING: The 'LOG_ARCHIVE_CONFIG' init.ora parameter settings
are inconsistent with another started instance. This may be
caused by the 'DB_UNIQUE_NAME' init.ora parameter being specified
differently on one or more of the other RAC instances; the
DB_UNIQUE_NAME parameter value MUST be identical for all
instances of the database.
Errors in file /u02/diag/rdbms/shas/shas2/trace/swprd2_lgwr_5292.trc:



--After looking at the paratemet log_archive_config it was null and also the DB_UNIQUE_NAME was same across 2 nodes.The we checked the view "Select * from v$dataguard_config" and identified that it has non identical entry from the other node.I used following steps to resolve the issue:


you can reset this parameter and bring the instance.

Just mount the instance - problematic one

alter system set log_archive_config='dg_config=(nodg_config)' scope=both sid='*';