RAC+ADG异机恢复，控制文件自动恢复

1、首先要设置控制文件自动备份
2、自动化恢复脚本，使用如下命令

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restore controlfile from autobackup;

此命令会找到最新的控制文件进行恢复，以下做一个测试来验证。
多次备份数据文件，生成多个控制文件备份。然后进行恢复操作，发现找到最近备份的控制文件进行恢复，我们也可以按照时间进行控制文件的删除。操作过程如下：

RMAN> show all;

RMAN configuration parameters for database with db_unique_name ORCL are:
CONFIGURE RETENTION POLICY TO REDUNDANCY 1; # default
CONFIGURE BACKUP OPTIMIZATION ON;
CONFIGURE DEFAULT DEVICE TYPE TO DISK; # default
CONFIGURE CONTROLFILE AUTOBACKUP ON;
CONFIGURE CONTROLFILE AUTOBACKUP FORMAT FOR DEVICE TYPE DISK TO '%F'; # default
CONFIGURE DEVICE TYPE DISK PARALLELISM 1 BACKUP TYPE TO BACKUPSET; # default
CONFIGURE DATAFILE BACKUP COPIES FOR DEVICE TYPE DISK TO 1; # default
CONFIGURE ARCHIVELOG BACKUP COPIES FOR DEVICE TYPE DISK TO 1; # default
CONFIGURE MAXSETSIZE TO UNLIMITED; # default
CONFIGURE ENCRYPTION FOR DATABASE OFF; # default
CONFIGURE ENCRYPTION ALGORITHM 'AES128'; # default
CONFIGURE COMPRESSION ALGORITHM 'BASIC' AS OF RELEASE 'DEFAULT' OPTIMIZE FOR LOAD TRUE ; # default
CONFIGURE ARCHIVELOG DELETION POLICY TO NONE; # default
CONFIGURE SNAPSHOT CONTROLFILE NAME TO '/u01/app/oracle/product/11.2.0/dbhome_1/dbs/snapcf_orcl1.f'; # default
RMAN>  delete backup of controlfile completed before 'sysdate-1/10';

using channel ORA_DISK_1

List of Backup Pieces
BP Key  BS Key  Pc# Cp# Status      Device Type Piece Name
------- ------- --- --- ----------- ----------- ----------
2       2       1   1   AVAILABLE   DISK        /u01/app/oracle/product/11.2.0/dbhome_1/dbs/c-1515642676-20180927-00
4       4       1   1   AVAILABLE   DISK        /u01/app/oracle/product/11.2.0/dbhome_1/dbs/c-1515642676-20180927-01

Do you really want to delete the above objects (enter YES or NO)? no

RMAN> 

RMAN> list backup of controlfile;

List of Backup Sets
===================

BS Key  Type LV Size       Device Type Elapsed Time Completion Time     
------- ---- -- ---------- ----------- ------------ --------------------
2       Full    17.70M     DISK        00:00:02     27-SEP-2018 11:08:08
        BP Key: 2   Status: AVAILABLE  Compressed: NO  Tag: TAG20180927×××10806
        Piece Name: /u01/app/oracle/product/11.2.0/dbhome_1/dbs/c-1515642676-20180927-00
  Control File Included: Ckp SCN: 794221       Ckp time: 27-SEP-2018 11:08:06

BS Key  Type LV Size       Device Type Elapsed Time Completion Time     
------- ---- -- ---------- ----------- ------------ --------------------
4       Full    17.70M     DISK        00:00:05     27-SEP-2018 11:09:18
        BP Key: 4   Status: AVAILABLE  Compressed: NO  Tag: TAG20180927×××10913
        Piece Name: /u01/app/oracle/product/11.2.0/dbhome_1/dbs/c-1515642676-20180927-01
  Control File Included: Ckp SCN: 794259       Ckp time: 27-SEP-2018 11:09:13

BS Key  Type LV Size       Device Type Elapsed Time Completion Time     
------- ---- -- ---------- ----------- ------------ --------------------
6       Full    17.70M     DISK        00:00:01     27-SEP-2018 14:13:46
        BP Key: 6   Status: AVAILABLE  Compressed: NO  Tag: TAG20180927×××41345
        Piece Name: /u01/app/oracle/product/11.2.0/dbhome_1/dbs/c-1515642676-20180927-02
  Control File Included: Ckp SCN: 801298       Ckp time: 27-SEP-2018 14:13:45

BS Key  Type LV Size       Device Type Elapsed Time Completion Time     
------- ---- -- ---------- ----------- ------------ --------------------
8       Full    17.70M     DISK        00:00:01     27-SEP-2018 14:15:02
        BP Key: 8   Status: AVAILABLE  Compressed: NO  Tag: TAG20180927×××41501
        Piece Name: /u01/app/oracle/product/11.2.0/dbhome_1/dbs/c-1515642676-20180927-03
  Control File Included: Ckp SCN: 801359       Ckp time: 27-SEP-2018 14:15:01

BS Key  Type LV Size       Device Type Elapsed Time Completion Time     
------- ---- -- ---------- ----------- ------------ --------------------
10      Full    17.70M     DISK        00:00:01     27-SEP-2018 14:16:06
        BP Key: 10   Status: AVAILABLE  Compressed: NO  Tag: TAG20180927×××41605
        Piece Name: /u01/app/oracle/product/11.2.0/dbhome_1/dbs/c-1515642676-20180927-04
  Control File Included: Ckp SCN: 801655       Ckp time: 27-SEP-2018 14:16:05

BS Key  Type LV Size       Device Type Elapsed Time Completion Time     
------- ---- -- ---------- ----------- ------------ --------------------
12      Full    17.70M     DISK        00:00:01     27-SEP-2018 14:16:27
        BP Key: 12   Status: AVAILABLE  Compressed: NO  Tag: TAG20180927×××41626
        Piece Name: /u01/app/oracle/product/11.2.0/dbhome_1/dbs/c-1515642676-20180927-05
  Control File Included: Ckp SCN: 801678       Ckp time: 27-SEP-2018 14:16:26

RMAN> restore controlfile to '/tmp/control01.clt' from autobackup;

Starting restore at 27-SEP-2018 14:28:50
using channel ORA_DISK_1

channel ORA_DISK_1: looking for AUTOBACKUP on day: 20180927
channel ORA_DISK_1: AUTOBACKUP found: c-1515642676-20180927-05
channel ORA_DISK_1: restoring control file from AUTOBACKUP c-1515642676-20180927-05
channel ORA_DISK_1: control file restore from AUTOBACKUP complete
Finished restore at 27-SEP-2018 14:28:53

RMAN>