ORA-01034: ORACLE not available解决

问题现象：

alter user scott account unlock;

ERROR at line 1:
ORA-01034: ORACLE not available
Process ID: 0
Session ID: 0 Serial number: 0

[oracle@rhel ~]$ echo $ORACLE_SID
xxxx
[oracle@rhel ~]$ sqlplus / as sysdba

SQL*Plus: Release 11.2.0.4. Production on Tue Sep  :: 

Copyright (c) , , Oracle.  All rights reserved.

Connected to an idle instance.

SQL> select userenv('language') from udal;
select userenv('language') from udal
*
ERROR at line 1:
ORA-01034: ORACLE not available
Process ID: 0
Session ID: 0 Serial number: 0

问题解决：

确认当前实例对不

export ORACLE_SID=xxxx     --设置

echo $ORACLE_SID=xxxx     --查看

查看监听状态

lsnrctl status

 sqlplus sys/123123@sznfpt as sysdba  #明确登录的用户及实例，就OK了

[oracle@rhel ~]$ sqlplus sys/@sznfpt as sysdba

SQL*Plus: Release 11.2.0.4. Production on Tue Sep  :: 

Copyright (c) , , Oracle.  All rights reserved.

Connected to:
Oracle Database 11g Enterprise Edition Release 11.2.0.4. - 64bit Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options

SQL>
SQL>
SQL> alter user scott account unlock;

User altered.

SQL>
SQL>
SQL> alter user scott identified by ;

User altered.

SQL>