What should you look at first to compute the number of undo blocks written per second to disk？ （）
A、V$UNDOSTAT
B、V$TRANSACTION
C、V$ROLLSTAT
D、DBA_UNDO_EXTENTS
E、DBA_ROLLBACK_SEGS
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What should you look at first to compute the number of undo blocks written per second to disk？ （）
A、V$UNDOSTAT
B、V$TRANSACTION
C、V$ROLLSTAT
D、DBA_UNDO_EXTENTS
E、DBA_ROLLBACK_SEGS
