Which view is useful for monitoring the effects of transaction executi – McqOptions

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1.	Which view is useful for monitoring the effects of transaction execution on undo space in the current instance in viewing information about undo?
A.	V$UNDOSTAT
B.	V$ROLLSTAT
C.	V$TRANSACTION
D.	DBA_UNDO_EXTENTS
Answer» B. V$ROLLSTAT

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