第一步：全备datafile,controlfile,spfile/pfile
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第二步：恢复日志。（原冷备的日志没有用，千万不要用！）
SQL> select member from v$logfile;
/ora/app/oracle/oradata/orcl/redo03.log
/ora/app/oracle/oradata/orcl/redo02.log
/ora/app/oracle/oradata/orcl/redo01.log
SQL> archive log list;
Database log mode No Archive Mode
Automatic archival Disabled
Archive destination USE_DB_RECOVERY_FILE_DEST
Oldest online log sequence 10
Current log sequence 12
SQL> ho rm $ORACLE_BASE/oradata/orcl/redo*.log --模拟日志文件丢失。
SQL> ho ls $ORACLE_BASE/oradata/orcl/redo*.log
ls: cannot access /ora/app/oracle/oradata/orcl/redo*.log: No such file or directory
SQL> startup force
ORACLE instance started.
Total System Global Area 1536602112 bytes
Fixed Size 2213616 bytes
Variable Size 956303632 bytes
Database Buffers 570425344 bytes
Redo Buffers 7659520 bytes
Database mounted.
ORA-00313: open failed for members of log group 3 of thread 1
ORA-00312: online log 3 thread 1: '/ora/app/oracle/oradata/orcl/redo03.log'
ORA-27037: unable to obtain file status
Linux-x86_64 Error: 2: No such file or directory
Additional information: 3
SQL> alter database open resetlogs; --第一步
alter database open resetlogs
*
ERROR at line 1:
ORA-01139: RESETLOGS option only valid after an incomplete database recovery
SQL> recover database using backup controlfile; --第二步
ORA-00279: change 1384991 generated at 05/22/2016 20:05:08 needed for thread 1
ORA-00289: suggestion : /ora/app/oracle/flash_recovery_area/ORCL/archivelog/2016_05_22/o1_mf_1_12_%u_.arc
ORA-00280: change 1384991 for thread 1 is in sequence #12
Specify log: {=suggested | filename | AUTO | CANCEL}
--注意：非归档，什么也不做，直接回车。
ORA-00308: cannot open archived log '/ora/app/oracle/flash_recovery_area/ORCL/archivelog/2016_05_22/o1_mf_1_12_%u_.arc'
ORA-27037: unable to obtain file status
Linux-x86_64 Error: 2: No such file or directory
Additional information: 3
SQL> alter database open resetlogs; --第三步
alter database open resetlogs
*
ERROR at line 1:
ORA-01113: file 1 needs media recovery
ORA-01110: data file 1: '/ora/app/oracle/oradata/orcl/system01.dbf'
SQL> alter system set "_allow_resetlogs_corruption"=true scope=spfile;
System altered. --第四步，使用隐藏参数，不做一致性检查启动数据库。
SQL> startup force mount; --第五步，重启到MOUNT状态下。
ORACLE instance started.
Total System Global Area 1536602112 bytes
Fixed Size 2213616 bytes
Variable Size 956303632 bytes
Database Buffers 570425344 bytes
Redo Buffers 7659520 bytes
Database mounted.
SQL> alter database open; --第六步
alter database open
*
ERROR at line 1:
ORA-01589: must use RESETLOGS or NORESETLOGS option for database open
SQL> alter database open resetlogs; --第七步，一般情况下会正常恢复。
ERROR:
ORA-03114: not connected to ORACLE
alter database open resetlogs
*
ERROR at line 1:
ORA-01092: ORACLE instance terminated. Disconnection forced
ORA-00600: internal error code, arguments: [2662], [0], [1384999], [0], [1385016], [4194432], [], [], [], [], [], []
Process ID: 28621
Session ID: 125 Serial number: 5
--由于隐藏参数导致的600错误。
SQL> exit
Disconnected from Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - 64bit Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options
[oracle@test ~]$ sqlplus / as sysdba
SQL*Plus: Release 11.2.0.1.0 Production on Sun May 22 22:56:21 2016
Copyright (c) 1982, 2009, Oracle. All rights reserved.
Connected to an idle instance.
SQL> select status from v$instance; --检查状态，数据库关闭了。
select status from v$instance
*
ERROR at line 1:
ORA-01034: ORACLE not available
Process ID: 0
Session ID: 0 Serial number: 0
SQL> startup mount; --再次启动
ORACLE instance started.
Total System Global Area 1536602112 bytes
Fixed Size 2213616 bytes
Variable Size 956303632 bytes
Database Buffers 570425344 bytes
Redo Buffers 7659520 bytes
Database mounted.
SQL> alter database open;
Database altered. --启动成功。
SQL> ho ls $ORACLE_BASE/oradata/orcl/red* --日志文件自动生成
/ora/app/oracle/oradata/orcl/redo01.log /ora/app/oracle/oradata/orcl/redo02.log /ora/app/oracle/oradata/orcl/redo03.log
SQL> alter system reset "_allow_resetlogs_corruption" scope=spfile sid='*';
System altered. --第八步，还原隐藏参数值。
SQL> startup force --第九步，重启数据库，使参数生效。
