When installing 8.1.6 Enterprise Edition, prompted to create a database. Used this option and it created a number of default tablespaces etc..TOOLS,INDX and DRSYS. As far as I can see only DRSYS has objects in it (tables/indexes) owned by CTXSYS. What does this schema do??? what are the tables and indexes for? Can I drop the tablespace without the database going ballistic????