Oracle database issues I had my database working properly but I had an issue and when I tried to repair it I executed the following command

alter tablespace system add datafile '/var/oracle/oradata/data.dbf' size 10000m autoextend on maxsize unlimited;

Then I noticed that the command didn't resolve my problem then I deleted the file data.dbf... But the problem that I'm having right now is that when I'm trying to restart my database it doesn't run.

I looked and didn't find how to fix the problem. Can someone help me? Any help please... I'm down
If you deleted the SYSTEM tablespace datafile as you say, and do not have a backup, there is no recovery. You will need to recreate the database.

Side note, you should never delete a datafile directly at the OS level and never the SYSTEM.