对于如何建立恢复目录数据库，相信大家都知道, 在此不再重复(建立专用表空间，建立用户，授权recovery_catalog_owner）。
一、 注册数据库：
1． 连接到恢复目录：
C:\>rman catalog rman/rman@rmandb
Recovery Manager: Release 9.2.0.1.0 - Production
Copyright (c) 1995, 2002, Oracle Corporation. All rights reserved.
connected to recovery catalog database
RMAN>
2．连接目标数据库：
RMAN> connect target sys/oracle@mydata
connected to target database: MYDATA (DBID=165830944)
RMAN>
3． 注册数据库
RMAN> register database;
database registered in recovery catalog
starting full resync of recovery catalog
full resync complete
RMAN>
二、取消数据库的注册
1．在SQLPLUS使用RMAN用户登录恢复目录
C:\>sqlplus /nolog
SQL*Plus: Release 9.2.0.1.0 - Production on Thu May 31 14:47:06 2007
Copyright (c) 1982, 2002, Oracle Corporation. All rights reserved.
SQL> connect rman/rman@rmandb
Connected.
SQL>
2．查找表DB 中的注册记录
SQL> select db_key,db_id from db;
DB_KEY DB_ID
---------- ----------
1224 3761021478
1844 165830944
SQL>
3．注销数据库（DB_ID值从RMAN命令连接目标数据库时可以查到 DBID=165830944，同时选择相应的db_Key)
PROCEDURE UNREGISTERDATABASE
Argument Name Type In/Out Default?
------------------------------ ----------------------- ------ --------
DB_KEY NUMBER IN
DB_ID NUMBER IN
SQL> execute dbms_rcvcat.unregisterdatabase(1844,165830944);
PL/SQL procedure successfully completed.
SQL>
4．验证注销动作
RMAN> list backup;
RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-03002: failure of list command at 05/31/2007 14:59:43
RMAN-06004: ORACLE error from recovery catalog database: RMAN-20001: target database not found in recovery catalog
RMAN>