单选题Your database is running under automatic undo management and the UNDO_RETENTION parameter is set to 900 sec. You executed the following command to enable retention guarantee： SQL> ALTER TABLESPACE undotbs1 RETENTION GUARANTEE; What effect would this
题目
单选题
Your database is running under automatic undo management and the UNDO_RETENTION parameter is set to 900 sec. You executed the following command to enable retention guarantee： SQL> ALTER TABLESPACE undotbs1 RETENTION GUARANTEE; What effect would this statement have on the database？（）
A
The extents in undo tablespace retain data until the next full database backup.
B
The extents containing committed data in the undo tablespace are never overwritten.
C
The extents which no longer contain uncommitted data in the undo tablespace are not overwritten for at least15 minutes.
D
The extents containing committed data in the undo tablespace are not overwritten until the instance is shut down.
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参考答案和解析
正确答案：
C
解析：
暂无解析