[Oracle DataBase Server 12.1 installation on Oracle Linux 6.7]: Enable ARCHIVELOG MODE

$ sqlplus / as sysdba

Show log_mode:

SQL> select log_mode from v$database;


LOG_MODE
------------
NOARCHIVELOG

Enable archivelog mode:

SQL> shutdown immediate;
SQL> startup mount exclusive;
SQL> alter database archivelog;
SQL> alter database open;



SQL> select log_mode from v$database;


LOG_MODE
------------------------------------
ARCHIVELOG

Show additional information:

SQL> ARCHIVE LOG LIST


Database log mode              Archive Mode
Automatic archival             Enabled
Archive destination            USE_DB_RECOVERY_FILE_DEST
Oldest online log sequence     30
Next log sequence to archive   32
Current log sequence           32


SQL> quit