Tablespace general question

Hi

After I have install Oracle with the database starter, I find that there is several tablespace, DRSYS, ROLLBACK_DATA, SYSTEM, TEMPORARY_DATA, USER_DATA. What are they? Can I delete them?

If I (my own Oracle DBA account) log in the SQL Plus and create a table or tablespace, does it make any differecne if I log in as INTERNAL or SYSTEM to create them? If so, what is the difference?

What is the difference if I select "instance started", "database mounted", and "database open" in the Instance Manager?

Thanks

Edmond

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