1.问题如下：
[oracle@xxx ~]$ sqlplus / as sysdba
SQL*Plus: Release 11.2.0.1.0 Production on Fri Apr 7 08:20:33 2023
Copyright (c) 1982, 2009, Oracle. All rights reserved.
ERROR:
ORA-01075: you are currently logged on
Enter user-name: ^C
[oracle@xxx ~]$
[oracle@xxx ~]$
[oracle@xxx ~]$
[oracle@xxx ~]$ sqlplus / as sysdba
> ^C
2.使用ipcs和ipcsrm命令释放oracle占用的共享内存
[root@xxx tmp]# ipcs -m | grep oracle | awk '{print $2}' | xargs ipcrm shm
resource(s) deleted
[root@xxx tmp]#
若oracle进程没有被kill的话，就先kill掉
# 使用Linux的kill命令杀死所有与oracle有关的进程[root@xxx tmp]# ps -ef |grep $ORACLE_SID|grep -v grep|awk '{print $2}' | xargs kill -9
3.再次登录，成功
[oracle@xxx ~]$ sqlplus / as sysdba
SQL*Plus: Release 11.2.0.1.0 Production on Fri Apr 7 08:22:15 2023
Copyright (c) 1982, 2009, Oracle. All rights reserved.
Connected to an idle instance.
SQL>
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