ORA-00313 ORA-00312 redo日志报错处理

1、前台启动数据库报错
SQL> alter database open;
alter database open
*
ERROR at line 1:
ORA-03113: end-of-file on communication channel
Process ID: 18809
Session ID: 1 Serial number: 50801
2、后台alter$ORACLE_SID.log 报错
alter database open
2017-09-16T21:38:38.117453+08:00
Ping without log force is disabled:
  instance mounted in exclusive mode.
Endian type of dictionary set to little
2017-09-16T21:38:38.136378+08:00
Errors in file /u01/app/oracle/diag/rdbms/orcl/orcl/trace/orcl_lgwr_18769.trc:
ORA-00313: open failed for members of log group 7 of thread 1
ORA-00312: online log 7 thread 1: '/u01/app/oracle/oradata/ORCL/onlinelog/redolog12.log'
ORA-27037: unable to obtain file status
Linux-x86_64 Error: 2: No such file or directory
Additional information: 7
ORA-00312: online log 7 thread 1: '/u01/app/oracle/oradata/ORCL/onlinelog/redolog8.log'
ORA-27037: unable to obtain file status
Linux-x86_64 Error: 2: No such file or directory
Additional information: 7
2017-09-16T21:38:38.136457+08:00
Errors in file /u01/app/oracle/diag/rdbms/orcl/orcl/trace/orcl_lgwr_18769.trc:
ORA-00313: open failed for members of log group 7 of thread 1
ORA-00312: online log 7 thread 1: '/u01/app/oracle/oradata/ORCL/onlinelog/redolog12.log'
ORA-27037: unable to obtain file status
Linux-x86_64 Error: 2: No such file or directory
Additional information: 7
ORA-00312: online log 7 thread 1: '/u01/app/oracle/oradata/ORCL/onlinelog/redolog8.log'
ORA-27037: unable to obtain file status
Linux-x86_64 Error: 2: No such file or directory
Additional information: 7
2017-09-16T21:38:38.137207+08:00
Errors in file /u01/app/oracle/diag/rdbms/orcl/orcl/trace/orcl_ora_18809.trc:
ORA-00313: open failed for members of log group 1 of thread 
ORA-00312: online log 7 thread 1: '/u01/app/oracle/oradata/ORCL/onlinelog/redolog8.log'
ORA-00312: online log 7 thread 1: '/u01/app/oracle/oradata/ORCL/onlinelog/redolog12.log'
2017-09-16T21:38:38.152526+08:00
TT00: Gap Manager starting (PID:19017)
2017-09-16T21:38:38.168038+08:00
USER (ospid: 18809): terminating the instance due to error 313
2017-09-16T21:38:38.253720+08:00
System state dump requested by (instance=1, osid=18809), summary=[abnormal instance termination].
System State dumped to trace file /u01/app/oracle/diag/rdbms/orcl/orcl/trace/orcl_diag_18751_20170916213838.trc
2017-09-16T21:38:38.393632+08:00
Dumping diagnostic data in directory=[cdmp_20170916213838], requested by (instance=1, osid=18809), summary=[abnormal instance termination].
2017-09-16T21:38:39.702685+08:00
Instance terminated by USER, pid = 18809


处理办法：
清除归档日志
alter database clear unarchived logfile group 7;
--alter database clear unarchived logfile group 2;
--alter database clear unarchived logfile group 3;


alter database open;

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