ORA-01075: you are currently logged on

[root@hear01 ~]# su - oracle
[oracle@hear01 ~]$ sqlplus "/as sysdba"

SQL*Plus: Release 11.2.0.2.0 Production on Tue Feb 21 00:26:35 2012

Copyright (c) 1982, 2010, Oracle.  All rights reserved.

ERROR:
ORA-01075: you are currently logged on

[oracle@hear01 ~]$
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爲了快速登陸oracle，好迅速啓動oracle，這裏提供一種超暴力的方法

1.使用Linux的kill命令殺死全部與oracle有關的進程
$ ps -ef |grep $ORACLE_SID|grep -v grep|awk '{print $2}' | xargs kill -9

2.使用Linux的ipcs和ipcsrm命令釋放oracle佔用的共享內存
$ ipcs -m | grep oracle | awk '{print $2}' | xargs ipcrm shm