CONTROL_FILE_RECORD_KEEP_TIME

该初始化参数用于指定控制文件可重用记录被覆盖之前可保留的最小天数，其数值范围为0~365，默认值为7.初始化参数Control_file_record_keep_time是动态参数，可以使用ALTER  SYSTEM命令进行修改。示例如下：

SQL>ALTER  SYSTEM  SET  Control_file_record_keep_time=8;

You are maintaining your database in Oracle10g. You want to store the information about the backup of the database in the control file. You issue the following statement:
SQL>ALTER SYSTEM SET CONTROL_FILE_RECORD_KEEP_TIME=400;
What is the outcome of this statement?
A. The statement will not execute successfully.
B. The statement will execute successfully, and the backups metadata will be maintained in the control file for 400 days
C. The statement will execute successfully, and the backups metadata will be maintained in the recovery catalog for 400 days.
D. Backups will be deleted from the media after 400 days.

A