Oracle Security Question:

Tell me What are the database administrators utilities avaliable?

So many database utilities are avalibale
1. SQLPLUS
2. RMAN
3. TKPROF
4. SQLLODAR
5. EXP,IMP AND EXPDP,IMPDP
6. EXPLAN PLAN
7. LSNRCTL
etc.

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What are the minimum parameters should exist in the parameter file (init.ora)?	Can you explain What are the roles and user accounts created automatically with the database?