一、RMAN 备份的内容
RMAN做数据库全备时包含了 数据文件、归档日志、控制文件和参数文件和备份日志，如下：
arch_20160223_08qukp2t_1_1 arch_20160223_0bqukp92_1_1 ctl_c-3234695588-20160223-01 rmanbak-20160223-0852.log scp_20160223_09qukp2u_1_1 scp_20160223_0aqukp2u_1_1
二、测试环境
OS：CentOS release 6.4 (Final)
Database：Oracle Database 12c Enterprise Edition Release 12.1.0.2.0 - 64bit Production
原平台与当前平台环境一致，但是oracle数据库目录结构不一致。
三、开始恢复
1、 确认原数据库的DBID（通过RMAN的备份日志，或者通过RMAN备份的控制文件名来识别），同时确认一下原数据库的实例名；
2、 将RMAN备份的内容拷贝到目标数据库上；
3、 设置好环境变量：
[oracle@dg1 ~]$ export NLS_DATA_FORMAT='YYYY-MM-DD HH24:MI:SS' [oracle@dg1 ~]$ export ORACLE_SID=scp [oracle@dg1 ~]$ rman target / Recovery Manager: Release 12.1.0.2.0 - Production on Fri May 6 22:18:52 2016
4、装载数据库并进行恢复
A、装载数据库
RMAN> set dbid=3234695588; executing command: SET DBID RMAN> startup nomount; startup failed: ORA-01078: failure in processing system parameters LRM-00109: could not open parameter file '/u01/app/oracle/product/12.1.0.2/dbs/initscp.ora' starting Oracle instance without parameter file for retrieval of spfile Oracle instance started
B、先恢复spfile文件（或者是pfile文件，可以修改各项参数），因为在spfile 文件中包含了控制文件的位置
RMAN> restore spfile to pfile '$ORACLE_HOME/dbs/initscp.ora' from '/home/OracleBack/rmanbak/ctl_c-3234695588-20160223-01';
OR：
RMAN> restore spfile to '$ORACLE_HOME/dbs/spfilescp.ora' from '/home/OracleBack/rmanbak/ctl_c-3234695588-20160223-01';
C、根据pfile文件中的相关参数去修改本地系统目录，或者修改这个pfile文件来匹配本地系统中的路径和目录，我们选择后者
需要修改：oracle_base、*.audit_file_dest、*.control_files、*.db_recovery_file_dest、*.db_recovery_file_dest_size、*.diagnostic_dest、*.log_archive_dest_1、
memory_target、undo_tablespace等。并在当前系统中创建好相关的目录和权限。
[oracle@dg1 dbs]$ vim initscp.ora scp.__data_transfer_cache_size=0 scp.__db_cache_size=822083584 scp.__java_pool_size=16777216 scp.__large_pool_size=33554432 scp.__oracle_base='/u01/app/oracle'#ORACLE_BASE set from environment scp.__pga_aggregate_target=654311424 scp.__sga_target=1241513984 scp.__shared_io_pool_size=50331648 scp.__shared_pool_size=301989888 scp.__streams_pool_size=0 *.audit_file_dest='/u01/app/oracle/admin/scp/adump' *.audit_trail='db' *.compatible='12.1.0.2.0' *.control_files='/u01/app/oracle/oradata/scp/control01.ctl','/u01/app/oracle/fast_recovery_area/scp/control02.ctl' *.db_block_size=8192 *.db_domain='' *.db_name='scp' *.db_recovery_file_dest='/u01/app/oracle/fast_recovery_area' *.db_recovery_file_dest_size=4560m *.diagnostic_dest='/u01/app/oracle' *.dispatchers='(PROTOCOL=TCP) (SERVICE=scpXDB)' *.log_archive_dest_1='LOCATION=/OracleArch' *.memory_target=1800m *.open_cursors=300 *.processes=300 *.remote_login_passwordfile='EXCLUSIVE' *.undo_tablespace='UNDOTBS1'
D、从修改后的pfile文件启动数据库，进行控制文件的恢复
RMAN> shutdown abort; RMAN> startup nomount pfile='$ORACLE_HOME/dbs/initscp.ora'; RMAN> restore controlfile from '/home/OracleBack/rmanbak/ctl_c-3234695588-20160223-01'; Starting restore at 06-MAY-16 allocated channel: ORA_DISK_1 channel ORA_DISK_1: SID=243 device type=DISK channel ORA_DISK_1: restoring control file channel ORA_DISK_1: restore complete, elapsed time: 00:00:01 output file name=/home/OracleData/scp/control01.ctl output file name=/home/OracleArch/fast_recovery_area/control02.ctl Finished restore at 06-MAY-16
E、控制文件恢复后就可以mount数据库了
RMAN> alter database mount;
Statement processed
released channel: ORA_DISK_1
F、至此，控制文件已经恢复，数据库已经mount，所有的RMAN配置参数均已设置，您应该验证路径以确保它们适用于该主机。
RMAN> show all; RMAN configuration parameters for database with db_unique_name SCP are: CONFIGURE RETENTION POLICY TO RECOVERY WINDOW OF 7 DAYS; CONFIGURE BACKUP OPTIMIZATION OFF; # default CONFIGURE DEFAULT DEVICE TYPE TO DISK; # default CONFIGURE CONTROLFILE AUTOBACKUP ON; CONFIGURE CONTROLFILE AUTOBACKUP FORMAT FOR DEVICE TYPE DISK TO '/orabackup/RmanBackupSet/20160223/ctl_%F'; 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 RMAN OUTPUT TO KEEP FOR 7 DAYS; # default CONFIGURE ARCHIVELOG DELETION POLICY TO NONE; # default CONFIGURE SNAPSHOT CONTROLFILE NAME TO '/u01/app/oracle/product/12.1.0.2/dbs/snapcf_scp.f'; # default
G、为了能让RMAN找到恢复文件的位置，我们有两种途径可以实现：一是修改RMAN配置以符合当前备份文件所在位置，其次是将RMAN备份文件拷贝到配置文件中设定的位置 （需要参考RMAN的备份日志）。在第一个方法中，为了让RMAN知道备份文件位置 /home/OracleBack/rmanbak ，我们使用catalog命令:
RMAN> catalog start with '/home/OracleBack/rmanbak'; Starting implicit crosscheck backup at 06-MAY-16 allocated channel: ORA_DISK_1 channel ORA_DISK_1: SID=243 device type=DISK Crosschecked 4 objects Finished implicit crosscheck backup at 06-MAY-16 Starting implicit crosscheck copy at 06-MAY-16 using channel ORA_DISK_1 Finished implicit crosscheck copy at 06-MAY-16 searching for all files in the recovery area cataloging files... no files cataloged searching for all files that match the pattern /home/OracleBack/rmanbak List of Files Unknown to the Database ===================================== File Name: /home/OracleBack/rmanbak/scp_20160223_09qukp2u_1_1 File Name: /home/OracleBack/rmanbak/arch_20160223_0bqukp92_1_1 File Name: /home/OracleBack/rmanbak/scp_20160223_0aqukp2u_1_1 File Name: /home/OracleBack/rmanbak/ctl_c-3234695588-20160223-01 File Name: /home/OracleBack/rmanbak/arch_20160223_08qukp2t_1_1 Do you really want to catalog the above files (enter YES or NO)? yes cataloging files... cataloging done List of Cataloged Files ======================= File Name: /home/OracleBack/rmanbak/scp_20160223_09qukp2u_1_1 File Name: /home/OracleBack/rmanbak/arch_20160223_0bqukp92_1_1 File Name: /home/OracleBack/rmanbak/scp_20160223_0aqukp2u_1_1 File Name: /home/OracleBack/rmanbak/ctl_c-3234695588-20160223-01 File Name: /home/OracleBack/rmanbak/arch_20160223_08qukp2t_1_1
H、对备份集做交叉检查，否则还原数据库时可能会报错
RMAN> crosscheck backup; using channel ORA_DISK_1 crosschecked backup piece: found to be 'EXPIRED' backup piece handle=/orabackup/RmanBackupSet/20160223/arch_20160223_08qukp2t_1_1 RECID=8 STAMP=904553565 crosschecked backup piece: found to be 'AVAILABLE' backup piece handle=/home/OracleBack/rmanbak/arch_20160223_08qukp2t_1_1 RECID=16 STAMP=911172456 crosschecked backup piece: found to be 'EXPIRED' backup piece handle=/orabackup/RmanBackupSet/20160223/scp_20160223_0aqukp2u_1_1 RECID=9 STAMP=904553567 crosschecked backup piece: found to be 'AVAILABLE' backup piece handle=/home/OracleBack/rmanbak/scp_20160223_0aqukp2u_1_1 RECID=14 STAMP=911172456 crosschecked backup piece: found to be 'EXPIRED' backup piece handle=/orabackup/RmanBackupSet/20160223/scp_20160223_09qukp2u_1_1 RECID=10 STAMP=904553567 crosschecked backup piece: found to be 'AVAILABLE' backup piece handle=/home/OracleBack/rmanbak/scp_20160223_09qukp2u_1_1 RECID=12 STAMP=911172456 crosschecked backup piece: found to be 'EXPIRED' backup piece handle=/orabackup/RmanBackupSet/20160223/arch_20160223_0bqukp92_1_1 RECID=11 STAMP=904553762 crosschecked backup piece: found to be 'AVAILABLE' backup piece handle=/home/OracleBack/rmanbak/arch_20160223_0bqukp92_1_1 RECID=13 STAMP=911172456 crosschecked backup piece: found to be 'AVAILABLE' backup piece handle=/home/OracleBack/rmanbak/ctl_c-3234695588-20160223-01 RECID=15 STAMP=911172456 Crosschecked 9 objects
I、通过控制文件获得表空间及数据文件列表
RMAN> report schema; RMAN-06139: WARNING: control file is not current for REPORT SCHEMA Report of database schema for database with db_unique_name SCP List of Permanent Datafiles =========================== File Size(MB) Tablespace RB segs Datafile Name ---- -------- -------------------- ------- ------------------------ 1 0 SYSTEM *** /u01/app/oracle/oradata/scp/system01.dbf 2 0 ZYTK_AC *** /u01/app/oracle/oradata/scp/zytk_ac01.dbf 3 0 SYSAUX *** /u01/app/oracle/oradata/scp/sysaux01.dbf 4 0 UNDOTBS1 *** /u01/app/oracle/oradata/scp/undotbs01.dbf 5 0 EXAMPLE *** /u01/app/oracle/oradata/scp/example01.dbf 6 0 USERS *** /u01/app/oracle/oradata/scp/users01.dbf 7 0 ZYTK_AC *** /u01/app/oracle/oradata/scp/zytk_ac02.dbf 8 0 ZYTK_ID *** /u01/app/oracle/oradata/scp/zytk_id01.dbf 9 0 ZYTK_ID *** /u01/app/oracle/oradata/scp/zytk_id02.dbf 10 0 ZYTK_OP *** /u01/app/oracle/oradata/scp/zytk_op01.dbf 11 0 ZYTK_OP *** /u01/app/oracle/oradata/scp/zytk_op02.dbf 12 0 ZYTK_TEST01 *** /u01/app/oracle/oradata/scp/zytk_test01.dbf List of Temporary Files ======================= File Size(MB) Tablespace Maxsize(MB) Tempfile Name ---- -------- -------------------- ----------- -------------------- 1 60 TEMP 32767 /u01/app/oracle/oradata/scp/temp01.dbf
注意：restore 的时候不会对temp 表空间进行restore。所以等restore 之后，我们需要手工创建temp表空间。
J、为了将数据文件恢复到不同于原来的目录结构中，必须编写脚本，重新命名数据文件的位置，最后进行全库的恢复。
（如果数据文件路径和原来的相同则直接还原数据库）
run{ set newname for datafile 1 to '/home/OracleData/scp/system01.dbf'; set newname for datafile 2 to '/home/OracleData/scp/zytk_ac01.dbf'; set newname for datafile 3 to '/home/OracleData/scp/sysaux01.dbf'; set newname for datafile 4 to '/home/OracleData/scp/undotbs01.dbf'; set newname for datafile 5 to '/home/OracleData/scp/example01.dbf'; set newname for datafile 6 to '/home/OracleData/scp/users01.dbf'; set newname for datafile 7 to '/home/OracleData/scp/zytk_ac02.dbf'; set newname for datafile 8 to '/home/OracleData/scp/zytk_id01.dbf'; set newname for datafile 9 to '/home/OracleData/scp/zytk_id02.dbf'; set newname for datafile 10 to '/home/OracleData/scp/zytk_op01.dbf'; set newname for datafile 11 to '/home/OracleData/scp/zytk_op02.dbf'; set newname for datafile 12 to '/home/OracleData/scp/zytk_test01.dbf'; restore database; switch datafile all;
}
对switch datafile all命令的说明：
--对于nocatalog 模式下，rman备份的信息是保存在控制文件里的，包括数据文件的路径信息。 这里的 switch datafile all 的作用，就是更新控制文件里的信息。如果不更新控制文件的话，则进行recover操作时还在原来的位置找文件。
K、还原数据库以后，进行 recover 操作
RMAN> recover database; Starting recover at 06-MAY-16 using channel ORA_DISK_1 starting media recovery channel ORA_DISK_1: starting archived log restore to default destination channel ORA_DISK_1: restoring archived log archived log thread=1 sequence=148 channel ORA_DISK_1: reading from backup piece /home/OracleBack/rmanbak/arch_20160223_0bqukp92_1_1 channel ORA_DISK_1: piece handle=/home/OracleBack/rmanbak/arch_20160223_0bqukp92_1_1 tag=ZYTK_DB_FULL channel ORA_DISK_1: restored backup piece 1 channel ORA_DISK_1: restore complete, elapsed time: 00:00:01 archived log file name=/home/OracleArch/ArchiveLog/1_148_899483175.dbf thread=1 sequence=148 unable to find archived log archived log thread=1 sequence=149 RMAN-00571: =========================================================== RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS =============== RMAN-00571: =========================================================== RMAN-03002: failure of recover command at 05/06/2016 23:53:58 RMAN-06054: media recovery requesting unknown archived log for thread 1 with sequence 149 and starting SCN of 3507749