Advantage of Tablespace

Hi Gurus,

I am new to ORACLE. I know that tablespaces group all of an application's objects to SIMPLIFY certain administrative operations. 1) What are admn. operations on all application's objects. eg : backup.

   What other admn. operations could be there ? 2) Does tablespaces only simplyfy admn. operations on objects ? What are the

   other advantages of having tablespaces (other than security of remaining    applications once a specific application get corrupted) ? In other words,    why are tablespaces required ? Can't we do without them taking Database as    an only entity ?

Thanks in Advance,
Rajesh

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