Which two statements are true regarding undo tablespaces?

Which two statements are true regarding undo tablespaces? (Choose two.)

Which two statements are true regarding undo tablespaces? (Choose two.)

A.
The database can have more than one undo tablespace

B.
The UNDO_TABLESPACE parameter is valid in both automatic and manual undo management

C.
Undo segments automatically grow and shrink as needed, acting as circular storage buffer for
their assigned transactions

D.
An undo tablespace is automatically created if the UNDO_TABLESPACE parameter is not set
and the UNDO_MANAGEMENT parameter is set to AUTO during the database instance start up



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