【多选题】
A <{p}>FLASHBACK QUERY
can retrieve REDO records from ONLINE and ARCHIVE D REDO LOG files.<{/p}>
B <{p}>FLASHBACK VERSION QUERY can retrieve REDO records from
ONLINE and ARCHIVE D REDO<{/p}><{p}>
LOG files<{br/}><{/p}>
C <{p}>FLASHBACK TABLE can undrop a column.<{/p}>
D <{p}>FLASHBACK DROP can undrop an index when
undropping a table.<{br/}><{/p}>
E <{p}>After a database is restored from flashback logs using
the FLASHBACK DATABASE command, it is<{span style="font-size: 1em;"}>sometimes rolled forward using redo logs.<{/span}><{/p}>
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