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- 单项选择题Your database instance is configured with automatic undo management and the UNDO_RETENTION parameter 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 on the 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 15minutes.
C、The extents containing committed data in the undo tablespace are not overwritten until the instance isshut down.
D、The extents containing committed undo in the undo tablespace are transferred to Flash Recovery Areabefore being overwritten.
- B
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