目前遇到過兩種情況 ，如下：
CASE 1:
SQL> startup force
ORACLE instance started.Total System Global Area 2672361472 bytes
Fixed Size 2256232 bytes
Variable Size 1392509592 bytes
Database Buffers 1258291200 bytes
Redo Buffers 19304448 bytes
Database mounted.
ORA-03113: end-of-file on communication channel
Process ID: 6300
Session ID: 193 Serial number: 3
文檔：
ORA-03113: end-of-file on communication channel
Cause: The connection between Client and Server process was broken.
Action: There was a communication error that requires further investigation.
實際中多爲TRACE 文件佔空間太多。
解決如下：（非生產環境，所以把所有的TRACE文件都刪除了）
SQL> startup nomount;
ORACLE instance started.
Total System Global Area 2672361472 bytes
Fixed Size 2256232 bytes
Variable Size 1392509592 bytes
Database Buffers 1258291200 bytes
Redo Buffers 19304448 bytes
SQL> alter database mount;
Database altered.
SQL> exit
Recovery Manager: Release 11.2.0.4.0 - Production on Tue Mar 11 11:32:04 2014
Copyright (c) 1982, 2011, Oracle and/or its affiliates. All rights reserved.
connected to target database: AD_TEST (DBID=846030938, not open)
RMAN> delete archivelog all;
using target database control file instead of recovery catalog
allocated channel: ORA_DISK_1
Do you really want to delete the above objects (enter YES or NO)? YES
RMAN> exit
Recovery Manager complete.
-bash-3.2$ sqlplus / as sysdba
SQL*Plus: Release 11.2.0.4.0 Production on Tue Mar 11 11:33:22 2014
Copyright (c) 1982, 2013, Oracle. All rights reserved.
Connected to:
Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64bit Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options
SQL> alter database open
2 ;
Database altered.
-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------
CASE2
SQL> startup
ORACLE instance started.
Total System Global Area 2672361472 bytes
Fixed Size 2256232 bytes
Variable Size 1392509592 bytes
Database Buffers 1258291200 bytes
Redo Buffers 19304448 bytes
Database mounted.
ORA-03113: end-of-file on communication channel
Process ID: 17653
Session ID: 193 Serial number: 3
SQL> create spfile from pfile;
ERROR:
ORA-03114: not connected to ORACLE
SQL> exit
Disconnected from Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64bit Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options
-bash-3.2$ sqlplus / as sysdba
SQL*Plus: Release 11.2.0.4.0 Production on Mon Mar 24 15:50:42 2014
Copyright (c) 1982, 2013, Oracle. All rights reserved.
Connected to an idle instance.
SQL> create spfile from pfile;
File created.
SQL> startup
ORACLE instance started.
Total System Global Area 2672361472 bytes
Fixed Size 2256232 bytes
Variable Size 1392509592 bytes
Database Buffers 1258291200 bytes
Redo Buffers 19304448 bytes
Database mounted.
ORA-38760: This database instance failed to turn on flashback database
SQL> alter database open
2 ;
alter database open
*
ERROR at line 1:
ORA-38760: This database instance failed to turn on flashback database
SQL> alter database flashback off;
Database altered.
SQL> alter database open;
Database altered.