主機備份拷貝到備機上進行Rman 還原，完成後用standy controlfile替換。
SQL*Plus: Release 12.2.0.1.0 Production on Fri May 15 11:06:00 2020
Copyright (c) 1982, 2016, Oracle. All rights reserved.
Connected to an idle instance.
SQL> startup nomount;
ORACLE instance started.
Total System Global Area 5.3687E+10 bytes
Fixed Size 12174808 bytes
Variable Size 6710889000 bytes
Database Buffers 4.6842E+10 bytes
Redo Buffers 122040320 bytes
SQL> alter database mount standby database;
Database altered.
但是打開只讀的時候出現錯誤：
SQL> alter database open read only;
alter database open read only
*
ERROR at line 1:
ORA-10458: standby database requires recovery
ORA-01152: file 1 was not restored from a sufficiently old backup
ORA-01110: data file 1: '/u01/app/oracle/oradata/ep/system01.dbf'
嘗試修復失敗
SQL> recover database;
ORA-00283: recovery session canceled due to errors
ORA-01610: recovery using the BACKUP CONTROLFILE option must be done
比對文件和控制文件的sn ,發現文件比控制文件要小。
SQL> select distinct CHECKPOINT_CHANGE# from v$datafile;
CHECKPOINT_CHANGE#
------------------
335610152
SQL> select CURRENT_SCN from v$database;
CURRENT_SCN
-----------
335617437
將最近的歸檔日誌拷貝到standby機器上
RMAN> catalog start with '/u01/app/oracle/logfiles';
using target database control file instead of recovery catalog
searching for all files that match the pattern /u01/app/oracle/logfiles
List of Files Unknown to the Database
=====================================
File Name: /u01/app/oracle/logfiles/1_17714_1021954304.dbf
File Name: /u01/app/oracle/logfiles/1_17715_1021954304.dbf
RMAN> recover database;
Starting recover at 15-MAY-20
allocated channel: ORA_DISK_1
channel ORA_DISK_1: SID=463 device type=DISK
starting media recovery
archived log for thread 1 with sequence 17715 is already on disk as file /u01/app/oracle/logfiles/1_17715_1021954304.dbf
archived log file name=/u01/app/oracle/logfiles/1_17715_1021954304.dbf thread=1 sequence=17715
media recovery complete, elapsed time: 00:01:29
Finished recover at 15-MAY-20
RMAN> quit
--重新打開數據庫，成功。
Connected to:
Oracle Database 12c Enterprise Edition Release 12.2.0.1.0 - 64bit Production
SQL> alter database open read only;
Database altered.