机器遭遇断电，之后oracle就不能启动了，报错ORA-03113: end-of-file oncommunication channel （通信通道的文件结尾）
SQL> startup
ORACLE instance started.
Total System Global Area1252663296 bytes
Fixed Size 2227944 bytes
Variable Size 704643352 bytes
Database Buffers 536870912 bytes
Redo Buffers 8921088 bytes
Database mounted.
ORA-03113: end-of-file oncommunication channel
Process ID: 8117
Session ID: 191 Serial number: 3
网上分析，可能由于昨晚数据库强制关闭，导致文件状态可能不一致，因为正常关闭数据库会同步校验各文件，使得重新启动的时候文件时间点一致。解决方案如下
启动DB
SQL> conn / as sysdba
Connected to an idle instance.
SQL> startup mount
ORACLE instance started.
直接reset不成功
SQL> select * from v$log;
GROUP# THREAD# SEQUENCE# BYTESBLOCKSIZE MEMBERS ARC
---------- ---------- -------------------- ---------- ---------- ---
STATUS FIRST_CHANGE# FIRST_TIMNEXT_CHANGE# NEXT_TIME
---------------- ---------------------- ------------ ---------
1 1 112 52428800 512 1 NO
INACTIVE 3826382 16-JUL-133857158 17-JUL-13
3 1 114 52428800 512 1 NO
CURRENT 3886899 17-JUL-132.8147E+14
2 1 113 52428800 512 1 NO
INACTIVE 3857158 17-JUL-133886899 17-JUL-13
SQL> alter database openresetlogs 2;
alter database open resetlogs 2
*
ERROR at line 1:
ORA-02288: invalid OPEN mode
恢复数据库
SQL> alter database openresetlogs;
alter database open resetlogs
*
ERROR at line 1:
ORA-01139: RESETLOGS option onlyvalid after an incomplete database recovery
SQL> recover database untiltime '2013-07-05'
Media recovery complete.
SQL> alter database openresetlogs;
Database altered.
成功。
