How to Turn Archiving OFF/ON

How to Turn Archiving OFF/ON

1. Shut down the database instance
SQL> shutdown immediate

2. Start up a new instance and mount, but do not open the database
SQL> startup mount

3. Put the database into archivelog mode/noarchivelog mode
SQL> alter database noarchivelog;
SQL> alter database archivelog;                                  >>>>>>>>>>> IF YOU NEED TO TURN ON ARCHIVING

4. Open the database
SQL> alter database open; 

5. Verify your database is now in noarchivelog/archivelog mode.
SQL> ARCHIVE LOG LIST
Database log mode                   Archive Mode
Automatic archival                    Disabled
Archive destination                   USE_DB_RECOVERY_FILE_DEST
Oldest online log sequence         22
Next log sequence to archive      24
Current log sequence                 24

SQL> alter system switch logfile;