单项选择题

When an UNDO segment is created manually by you, its availability status is set to which of the following automatically by Oracle?（）

A.Online 
B.Pending online 
C.Offline 
D.Stale

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单项选择题
WhendeterminingthenumberofUNDOsegmentsinadatabase,whichofthefollowingchoicesidentifiesafactortoconsider?（）

A.Size of typical transactions 
B.Concurrent transactions 
C.Size of rows in table most frequently changed 
D.Number of anticipated disk sorts
单项选择题
Youaretryingtodeterminehowmanydisksortsarehappeningonthedatabaserightnow.Whichofthefollowingdictionarytableswouldyouusetofindthatinformation?（）

A.V$SESSION 
B.V$SYSSTAT 
C.DBA_SEGMENTS 
D.V$SORT_USAGE
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