1.文档目标
新建的数据库只有一个控制文件副本，希望增加控制文件副本到不同位置，防止控制文件发生损坏。
2.修改control_files参数
# 如果使用了OMF则可以在修改参数时只指定路径，无需指定绝对路径，是否使用OMF即是否设置了db_create_file_dest 参数。 SYS@honor1 > show parameter control_files; NAME TYPE VALUE ------------------------------------ ----------- ------------------------------ control_files string +DATADG/honor/controlfile/current.260.984508003 control_management_pack_access string DIAGNOSTIC+TUNING SYS@honor1 > alter system set control_files='+DATADG/honor/controlfile/current.260.984508003','+datadg' scope=spfile sid='*'; System altered. Elapsed: 00:00:00.01 SYS@honor1 > shutdown immediate; Database closed. Database dismounted. ORACLE instance shut down. 10:16:35 SYS@honor1 > exit
3.使用RMAN利用现有controlfile创建副本
（1）创建控制文件副本 [oracle@db-oracle-node1 ~]$ rman target / Recovery Manager: Release 11.2.0.4.0 - Production on Mon Dec 9 10:17:27 2019 Copyright (c) 1982, 2011, Oracle and/or its affiliates. All rights reserved. connected to target database (not started) RMAN> startup nomount; Oracle instance started Total System Global Area 521936896 bytes Fixed Size 2254824 bytes Variable Size 440403992 bytes Database Buffers 75497472 bytes Redo Buffers 3780608 bytes RMAN> restore controlfile from '+DATADG/honor/controlfile/current.260.984508003'; Starting restore at 09-DEC-19 allocated channel: ORA_DISK_1 channel ORA_DISK_1: SID=34 instance=honor1 device type=DISK channel ORA_DISK_1: copied control file copy output file name=+DATADG/honor/controlfile/current.260.984508003 output file name=+DATADG/honor/controlfile/current.294.1026555549 Finished restore at 09-DEC-19 RMAN> alter database mount; database mounted released channel: ORA_DISK_1 RMAN> alter database open; database opened RMAN> exit Recovery Manager complete. （2）查看control_files参数 [oracle@db-oracle-node1 ~]$ sqlplus / as sysdba SQL*Plus: Release 11.2.0.4.0 Production on Mon Dec 9 10:41:18 2019 Copyright (c) 1982, 2013, Oracle. All rights reserved. Connected to: Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64bit Production With the Partitioning, Real Application Clusters, Automatic Storage Management, OLAP, Data Mining and Real Application Testing options SYS@honor1 > show parameter control_files; NAME TYPE VALUE ------------------------------------ ----------- ------------------------------ control_files string +DATADG/honor/controlfile/curr ent.260.984508003, +DATADG/hon or/controlfile/current.294.102 6555549