To change database to archivelog or noarchivelog mode the database has to be in mount stage. If one tries to change the database to archivelog/noarchivelog during mount stage you will receive the following error message. 01:00:04 sys@TESTDB> alter database noarchivelog; alter database noarchivelog * ERROR at line 1: ORA-01507: database not mounted Or if the … Continue reading Change archivelog/noarchivelog →