Hi,
I am trying to clean up my database. I would like to remove
all unnecessary schema's from (none)system tablespaces.

I found these schema's in (none)system tablespaces(CTXSYS,MDSYS,ORDSYS,OUTLN), and I was wondering what r they and if I can delete them. Also why SYSTEM is using
system and tools tablespaces.

schema------table_name-------tablespace
---------------------------------------------
CTXSYS ---> DR$----------------DRSYS
MDSYS----->MD$,CS_SRS------SYSTEM
ORDSYS--->ORD_---------------SYSTEM
OUTLN----->OL$,OL$HINTS-----SYSTEM
SYSTEM---->!!!!!-----------------SYSTEM,TOOLS
SYS-------->!!!!!------------------SYSTEM

THANKS,