Startup The Database In Archivelog Mode / NoArchivelog Mode

Startup The Database In Archivelog Mode
Steps Required To Take A Database Not In Archive Log Mode And Alter It To Archive Log Mode	SELECT log_mode FROM v$database; SHUTDOWN; STARTUP MOUNT EXCLUSIVE; ALTER DATABASE ARCHIVELOG; ALTER DATABASE OPEN; SELECT log_mode FROM v$database;
Startup The Database In NoArchivelog Mode
Steps Required To Take A Database In Archive Log Mode And Alter It To No Archive Log Mode	SELECT log_mode FROM v$database; SHUTDOWN; STARTUP MOUNT EXCLUSIVE; ALTER DATABASE NOARCHIVELOG; ALTER DATABASE OPEN; SELECT log_mode FROM v$database;

 

Source: http://psoug.org/reference/archivelog.html