当没有恢复目录的时候，RMAN相关的备份信息，比如归档路径、备份集路径等均存在目标数据库的控制文件，但是控制文件并不能无限增
当没有恢复目录的时候，RMAN相关的备份信息，比如归档路径、备份集路径等均存在目标数据库的控制文件，但是控制文件并不能无限增长，而且控制文件也不仅仅是用来存储与备份相关的信息，因此RMAN也有一个专门存放备份信息的地方。当待备份的数据库注册到恢复目录之后，RMAN相关的信息除了保存在控制文件中外（只保存一部分），更加详细的信息就被存在恢复目录中。
注意：不要将恢复目录数据库放到目标数据库中。
步骤：
（1）创建一个独立的表空间和一个独立的SCHEMA，用来记录备份信息，并授予相关权限
（2）通过RMAN连接到新创建的恢复目录中，创建catalog
恢复目录创建完毕，一个恢复目录数据库可以同时为多个目标数据库提供服务。不过使用恢复目录执行备份操作之前，要注册该数据库。
（3）以catalog模式连接到目标数据库和恢复目录
注意：若是DBA管理的Oracle数据库比较多，那么对于这些数据库的备份，建议使用恢复目录管理，这样既方便备份和恢复操作，而且安全性也比较高。执行完备份操作后，单独备份目录数据库即可。但是如果DBA仅管理一个或数个数据库，，NOCATALOG模式操作会更加方便。
推荐阅读：
RMAN 配置归档日志删除策略
Oracle基础教程之通过RMAN复制数据库
RMAN备份策略制定参考内容
RMAN备份学习笔记
Oracle数据库备份加密 RMAN加密
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