I installed oracle 10g software and connected to ORCL database in SQL Developer. when I expand the tables section I see a lot of tables there like in image below. What are these tables for? HOw can I create a database that does not have these tables?
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You connected as SYS user. Now you should create your user with command
CREATE USER user_name IDENTIFIED BY password
After it you will be able to connect as new user which doesn't have any tables.
Maybe you will need to GRANT CREATE SESSION to user_name
to be able to connect.
In Oracle each user has its own schema where stored all user's objects (tables, functions, packages and so on)

Tatiana
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@Taiana now if i try to login with this new username/password i get error message insufficient privileges. How do I give access to this 'ORCL' database to this new user? – WAQ Dec 15 '15 at 10:48
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@WasimQadir Did you grant `create session` privilege to at least let the new user create a session. Anyway, you current topic is marked as duplicate, so it is answered. If you have a new question, please ask a new question. – Lalit Kumar B Dec 15 '15 at 10:54
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@Taiana I did. still getting the same error – WAQ Dec 15 '15 at 10:58