试题详情
- 多项选择题 These are the details about V$FLASHBACK_DATABASE_STAT： SQL> DESC V$FLASHBACK_DATABASE_STAT Name Null？ Type ------------- -------- -------------- BEGIN_TIME DATE END_TIME DATE FLASHBACK_DATA NUMBER DB_DATA NUMBER REDO_DATA NUMBER ESTIMATED_FLASHBACK_SIZE NUMBER Which two statements regarding the V$FLASHBACK_DATABASE_STAT view are true？ （）
A、BEGIN_TIME is the time at which Flashback logging is enabled.
B、END_TIME is the time at which the query is executed on the view.
C、REDO_DATA is the number of bytes of redo data written during the interval.
D、This view contains information about flashback data pertaining to the last 24 hours.
E、FLASHBACK_DATA is the amount of flashback data generated since the database was opened.
- C,D
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