To know if the database is in Oracle Database - ARCHIVELOG or Oracle Database - NOARCHIVELOG mode, you have to perform the statement below :
gerardnico@orcl> select log_mode from v$database;
LOG_MODE
------------
NOARCHIVELOG
The default mode in the creation of a database is Oracle Database - NOARCHIVELOG to prevent the generation of Oracle Database - Redo Log (Transaction Log Files) during the installation.