oracle启动报ORA-03113;

SQL> startup
ORACLE instance started.

Total System Global Area 1.0489E+10 bytes
Fixed Size                  2216224 bytes
Variable Size            1677725408 bytes
Database Buffers         8791261184 bytes
Redo Buffers               17842176 bytes
Database mounted.
ORA-03113: end-of-file on communication channel
Process ID: 29821
Session ID: 24 Serial number: 3

*** 2015-09-21 15:30:40.856
*** SESSION ID:(24.3) 2015-09-21 15:30:40.856
*** CLIENT ID:() 2015-09-21 15:30:40.856
*** SERVICE NAME:() 2015-09-21 15:30:40.856
*** MODULE NAME:(sqlplus@szmlserver95_205.easou.com (TNS V1-V3)) 2015-09-21 15:30:40.856
*** ACTION NAME:() 2015-09-21 15:30:40.856
 
DDE rules only execution for: ORA 312
----- START Event Driven Actions Dump ----
---- END Event Driven Actions Dump ----
----- START DDE Actions Dump -----
Executing SYNC actions
----- START DDE Action: ‘DB_STRUCTURE_INTEGRITY_CHECK‘ (Async) -----
Successfully dispatched
----- END DDE Action: ‘DB_STRUCTURE_INTEGRITY_CHECK‘ (SUCCESS, 0 csec) -----
Executing ASYNC actions
----- END DDE Actions Dump (total 0 csec) -----
DDE: Problem Key ‘ORA 312‘ was flood controlled (0x1) (no incident)
ORA-00312: online log 1 thread 1: ‘+HZ_DG1/hz/onlinelog/group_1.261.787682297‘
ORA-00312: online log 1 thread 1: ‘+HZ_DG1/hz_dg1/onlinelog/group_1.273.788525363‘
ORA-16014: log 1 sequence# 18130 not archived, no available destinations
ORA-00312: online log 1 thread 1: ‘+HZ_DG1/hz/onlinelog/group_1.261.787682297‘
ORA-00312: online log 1 thread 1: ‘+HZ_DG1/hz_dg1/onlinelog/group_1.273.788525363‘

SQL> shutdown immediate;
ORA-01034: ORACLE not available
ORA-27101: shared memory realm does not exist
Linux-x86_64 Error: 2: No such file or directory
SQL> startup mount
ORACLE instance started.

Total System Global Area 1.0489E+10 bytes
Fixed Size                  2216224 bytes
Variable Size            1677725408 bytes
Database Buffers         8791261184 bytes
Redo Buffers               17842176 bytes
Database mounted.
SQL> alter database clear unarchived logfile group 1;

Database altered.

SQL> shutdown immediate;
ORA-01109: database not open

Database dismounted.
ORACLE instance shut down.
SQL> startup
ORACLE instance started.

Total System Global Area 1.0489E+10 bytes
Fixed Size                  2216224 bytes
Variable Size            1677725408 bytes
Database Buffers         8791261184 bytes
Redo Buffers               17842176 bytes
Database mounted.
Database opened.
SQL> exit