1.启动到mount状态
> startup mount
2.用open resetlogs打开
> alter database open resetlogs
3.关库
> shutdown
4.重新启动
> startup
注释：打开数据库后显示ORA-03114 not connected to ORACLE
Cause:
A call to Oracle was attempted when no connection was established. Usually this happens
because a user-written program has not logged on. It may happen if communication trouble causes
a disconnection. In addition, this message could occur when ALTER SYSTEM KILL SESSION or ALTER
SYSTEM DISCONNECT SESSION were issued with the IMMEDIATE qualifier because, in those cases,
the client's connection to the database is terminated without waiting for the client to issue a request.
Action: Try again. If the message recurs and the program is user written, check the program.
解决：
启动监听
[oracle@solaris186:/export/home/oracle]$ lsnrctl start
重新开库
[oracle@solaris186:/export/home/oracle]$sqlplus / as sysdba
SYS@ prod>startup
SYS@ prod>show parameter undo;
NAME TYPE VALUE
------------------------------------ ----------- ------------------------------
undo_management string AUTO
undo_retention integer 900
undo_tablespace string UNDOTBS1
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