Creating table space steps In order for me to create space in the database is this all I need to do?
alter tablespace USER_DATA_TBS add datafile '/oradata/bosv/user_data04.dbf' size 10m; 

Or are there other steps I need to take?
I looked at this guide.
I would appreciate if you could point me in the correct direction.
This is what I have after I created  a datafile:
What you did, was to add another datafile (quite tiny one, though) to an existing tablespace. If that was your intention, then I'd say you succeeded.
However, as title says &quot;CREATE&quot; and if you wanted to create another tablespace, then you should have used CREATE TABLESPACE command (which is also described in document whose link you posted).