I was working on an activity that required me to set some datafile offline when I received the following error: After some analysis, I realized that the database was in no archive mode, and to be able to make a datafile offline, the database must be in archive mode. Therefore, I enabled the archive mode in the database by restarting the database in the MOUNT state, allowing the archive to mode option, and after it was possible to change the status of the database as below: brunorsHi! I am Bruno,…