單項(xiàng)選擇題

Your database instance is configured with automatic undo management and the UNDO_RETENTIONparameter is set to 900 seconds. You executed the following command to enable retention guarantee:
SQL> ALTER TABLESPACE undotbs1 RETENTION GUARANTEE;
What effect would this command have onthe database（）

A.The extents in the undo tablespace retain data until the next full database backup.
B.The extents containing committed undo in the undo tablespace are not overwritten for at least 15 minutes.
C.The extents containing committed data in the undo tablespace are not overwritten until the instance is shutdown.
D.The extents containing committed undo in the undo tablespace are transferred to Flash Recovery Areabefore being overwritten

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單項(xiàng)選擇題

You want to enable archiving on your database. Presently， the database is running in NOARCHIVELOG mode.Given below are the steps to accomplish the task in random order：
1. Shut down the instance.
2. Execute the ALTER DATABASE ARCHIVELOG command.
3. Start up the instance and mount the database.
4. Set the DB_RECOVERY_FILE_DEST initialization parameter to $ORACLE_HOME/dest_1.
5. Open the database.
Which is the correct sequence of steps for accomplishing the task（）

A.4， 1， 3， 2， 5
B.1， 3， 4， 5， 2
C.1， 3， 2， 5； 4 not required
D.4， 1， 5， 2； 3 not required
E.1， 3， 4， 5； 2 not required

單項(xiàng)選擇題

Which statement is true about the UNDO_RETENTION parameter when retention guarantee is not enabled（）

A.It is the time period after which the undo data becomes obsolete.
B.It is the time period after which the committed undo data would be transferred to a temporary tablespace.
C.It is the minimum time period up to which the committed undo data would be retained if free undo space isavailable.
D.It is the time period after which the undo data is transferred to the Flash Recovery Area to provide readconsistency.

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Your database instance is configured with automatic undo management and the UNDO_RETENTIONparameter is set to 900 seconds. You executed the following command to enable retention guarantee: SQL> ALTER TABLESPACE undotbs1 RETENTION GUARANTEE; What effect would this command have onthe database（）

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Which statement is true about the UNDO_RETENTION parameter when retention guarantee is not enabled（）

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Your database instance is configured with automatic undo management and the UNDO_RETENTIONparameter is set to 900 seconds. You executed the following command to enable retention guarantee:
SQL> ALTER TABLESPACE undotbs1 RETENTION GUARANTEE;
What effect would this command have onthe database（）