Oracle - Alter database to archivelog mode

SQL> archive log list;

Database log mode              No Archive Mode

Automatic archival             Disabled

Archive destination            USE_DB_RECOVERY_FILE_DEST

Oldest online log sequence     208

Current log sequence           218

SQL> shutdown immediate;

Database closed.

Database dismounted.

ORACLE instance shut down.

SQL> startup mount

ORACLE instance started.

Total System Global Area 5745586176 bytes

Fixed Size                  2238736 bytes

Variable Size            3791652592 bytes

Database Buffers         1946157056 bytes

Redo Buffers                5537792 bytes

Database mounted.

SQL> alter database archivelog;

Database altered.

SQL> alter database open;

Database altered.

SQL> archive log list;

Database log mode              Archive Mode

Automatic archival             Enabled

Archive destination            USE_DB_RECOVERY_FILE_DEST

Oldest online log sequence     208

Next log sequence to archive   218

Current log sequence           218