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

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

出自：Oracle认证

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