Can you please read the manual carefully and follow our advice? Don’t put something at the cfg-file you think it should be there.
The mk_oracle plugin gathers all needed information about the oracle environment on it’s own if the really needed information are correctly configured inside the /etc/check_mk/mk_oracle.cfg.
As i wrote earlier, the minimum information needed are the following (from which some could be empty):
DBUSER='<user>:<password>:<role>:<dbhost>:<listenerport>'
ASMUSER='<user>:<password>:<role>:<dbhost>:<listenerport>'