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NO.1 When is the UNDO_RETENTION parameter value ignored by a transaction?
A. when Flashback Database is enabled
B. when the data file of the undo tablespace is autoextensible
C. when there are multiple undotablespaces available in a database
D. when the undo tablespace is of a fixed size and retention guarantee is not enabled
Answer: D
Reference: http://docs.oracle.com/cd/B19306_01/server.102/b14231/undo.htm (undo retention,
see the bullets)

NO.2 Restore the database.

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