After you unregister a database from a recovery catalog, what happens to backup metadata in the recovery catalog?
A. You must migrate the backup metadata from the recovery catalog to the control file before unregistering the database from the recovery catalog.
B. The backup metadata is maintained in the control file for a number of days specified by the initialization parameter CONTROL_FILE_RECORD_KEEP_TIME and immediately removed from the recovery catalog.
C. The backup metadata is retained in the control file, and the database structure metadata remains in the recovery catalog.
D. The backup metadata is maintained in the control file and in the recovery catalog for a number of days specified by the initialization parameter CONTROL_FILE_RECORD_KEEP_TIME.
Answer: B
备份元数据保存在控制文件,保存时间(天数)由初始化参数CONTROL_FILE_RECORD_KEEP_TIME设定，并且立即从恢复目录删除。来自 “ ITPUB博客 ” ，链接：https://blog.itpub.net/81227/viewspace-2124988/ ，如需转载，请注明出处，否则将追究法律责任。
