Question: What is the difference between the B - tree and bitmap index structures What is the purpose of a role in Oracle 1 2 c

What is the difference between the B

-

tree and bitmap index structures

What is the purpose of a role in Oracle

12

?

What happens if you revoke an object privilege that was granted with the WITH GRANT OPTION? What if the privilege is removed from a user who had granted the same object privilege to three other users?

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