一：密码特殊字符无法登录
[oracle@oracle11g ~]$ sqlplus dbmon/"S0!hL9.n7C@3"
-bash: !hL9.n7C@3": event not found
解决办法：
[oracle@oracle11g ~]$ sqlplus 'dbmon/"S0!hL9.n7C@3"'
SQL*Plus: Release 11.2.0.4.0 Production on Sat Nov 20 17:36:10 2021
Copyright (c) 1982, 2013, Oracle. All rights reserved.
Connected to:
Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64bit Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options
SQL>
二：操作系统安装中文，sqlplus登录数据库出现乱码
[oracle@xxxxx ~]$ sqlplus / as sysdba
SQL*Plus: Release 12.2.0.1.0 Production on Sat Nov 20 17:38:07 2021
Copyright (c) 1982, 2016, Oracle. All rights reserved.
???:
Oracle Database 12c Enterprise Edition Release 12.2.0.1.0 - 64bit Production
SQL>
解决办法：操作系统设置nls_lang，这里需要注意的是，nls_lang设置任何的字符集都可以避免乱码的出现，演示如下
[oracle@xxxx ~]$ export NLS_LANG=AMERICAN_AMERICA.AL32UTF8
[oracle@xxxx ~]$ sqlplus / as sysdba
SQL*Plus: Release 12.2.0.1.0 Production on Sat Nov 20 17:39:34 2021
Copyright (c) 1982, 2016, Oracle. All rights reserved.
Connected to:
Oracle Database 12c Enterprise Edition Release 12.2.0.1.0 - 64bit Production
SQL>
[oracle@xxxx ~]$ export NLS_LANG="SIMPLIFIED CHINESE"_CHINA.AL32UTF8
[oracle@xxxx ~]$ sqlplus / as sysdba
SQL*Plus: Release 12.2.0.1.0 Production on 星期六 11月 20 17:41:29 2021
Copyright (c) 1982, 2016, Oracle. All rights reserved.
连接到:
Oracle Database 12c Enterprise Edition Release 12.2.0.1.0 - 64bit Production
SQL>