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Which three statements are true about sequences in a single instance Oracle database?

Which three statements are true about sequences in a single instance Oracle database?

A.

A sequence's unallocated cached values are lost if the instance shuts down.

B.

Two or more tables cannot have keys generated from the same sequence.

C.

A sequence number that was allocated can be rolled back if a transaction fails.

D.

A sequence can issue duplicate values.

E.

Sequences can always have gaps.

F.

A sequence can only be dropped by a DBA.

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