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