hercules.oracle> ORACLE_SID=${NEW_NAME}; export ORACLE_SID                                                                                              
hercules.oracle> sqlplus / as sysdba

SQL*Plus: Release 11.2.0.3.0 Production on Fri Mar 17 13:27:13 2017

Copyright (c) 1982, 2011, Oracle.  All rights reserved.


Connected to:
Oracle Database 11g Enterprise Edition Release 11.2.0.3.0 - 64bit Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options

SQL> shutdown immediate
ORA-01109: database not open


Database dismounted.
ORACLE instance shut down.
SQL> startup mount
ORACLE instance started.

Total System Global Area  801939456 bytes
Fixed Size                  2163592 bytes
Variable Size             176168056 bytes
Database Buffers          612368384 bytes
Redo Buffers               11239424 bytes
Database mounted.
SQL> select group# from v$standby_log;

    GROUP#
----------
         4
         5

SQL> alter database drop logfile group 5;

Database altered.

SQL> alter database drop logfile group 4;

Database altered.

SQL> select group# from v$standby_log;

no rows selected

SQL> recover managed standby database disconnect 
Media recovery complete.

$ ORACLE_SID=tst sqlplus / as sysdba

SQL*Plus: Release 11.2.0.3.0 Production on Fri Mar 17 13:43:24 2017

Copyright (c) 1982, 2011, Oracle.  All rights reserved.


Connected to:
Oracle Database 11g Enterprise Edition Release 11.2.0.3.0 - 64bit Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options

SQL>  alter system set log_archive_dest_4='service=newtst lgwr async=20480 noaffirm reopen=10 register optional valid_for=(online_logfiles, primary_role) db_unique_name=newtst';

System altered.

Fri Mar 17 13:48:05 2017
Media Recovery Log /u/app/oracle/admin/newtst/arch/1_31425_667124704.arc
Media Recovery Waiting for thread 1 sequence 31426 (in transit)
Fri Mar 17 13:50:51 2017
RFS[2]: Possible network disconnect with primary database
Fri Mar 17 13:50:51 2017
RFS[1]: Possible network disconnect with primary database
Fri Mar 17 13:50:51 2017
RFS[3]: Assigned to RFS process 18740
RFS[3]: Possible network disconnect with primary database
Fri Mar 17 13:50:54 2017
FAL[client]: Error fetching gap sequence, no FAL server specified

Fri Mar 17 13:53:13 2017
ALTER DATABASE RECOVER  standby database
Media Recovery Start
 started logmerger process
Fri Mar 17 13:53:13 2017
Managed Standby Recovery not using Real Time Apply
Parallel Media Recovery started with 32 slaves
ORA-279 signalled during: ALTER DATABASE RECOVER  standby database  ...
Fri Mar 17 13:53:44 2017
ALTER DATABASE RECOVER    LOGFILE '/u/app/oracle/oradata/tst/redo02.log'
Media Recovery Log /u/app/oracle/oradata/tst/redo02.log
Fri Mar 17 13:53:44 2017
Incomplete recovery applied all redo ever generated.
Recovery completed through change 18111429189 time 03/17/2017 13:50:50
Media Recovery Complete (newtst)
Completed: ALTER DATABASE RECOVER    LOGFILE '/u/app/oracle/oradata/tst/redo02.log'
Fri Mar 17 13:54:03 2017
alter database activate standby database
ALTER DATABASE ACTIVATE [PHYSICAL] STANDBY DATABASE (newtst)
Begin: Standby Redo Logfile archival
End: Standby Redo Logfile archival
RESETLOGS after complete recovery through change 18111429189
Resetting resetlogs activation ID 2004787725 (0x777ea20d)
Online log /u/app/oracle/oradata/newtst/redo01.log: Thread 1 Group 1 was previously cleared
Online log /u/app/oracle/oradata/newtst/redo02.log: Thread 1 Group 2 was previously cleared
Online log /u/app/oracle/oradata/newtst/redo03.log: Thread 1 Group 3 was previously cleared
Standby became primary SCN: 18111429187
Fri Mar 17 13:54:04 2017
Setting recovery target incarnation to 4
ACTIVATE STANDBY: Complete - Database mounted as primary
Completed: alter database activate standby database
Fri Mar 17 13:54:14 2017
alter database open resetlogs
ORA-1139 signalled during: alter database open resetlogs...
alter database open
...