1.修改ORACLE允许的最大连接数

[oracle@localhost ~]$ sqlplus / as sysdba

SQL> connect sys/sys as sysdba;

SQL> alter system set processes=400 scope = spfile; 

SQL> create pfile from spfile; 

SQL> shutdown immediate; 

SQL> startup;

2、将密码有效期由默认的180天修改成“无限制”：

sql>ALTER PROFILE DEFAULT LIMIT PASSWORD_LIFE_TIME UNLIMITED;

3．修改密码

sql> alter user newca identified by 12345

一劳永逸破解11G180天自动密码失效的办法：

查询密码有效期

SELECT * FROM dba_profiles WHERE profile='DEFAULT' AND resource_name='PASSWORD_LIFE_TIME';

修改为无限制：

ALTER PROFILE DEFAULT LIMIT PASSWORD_LIFE_TIME UNLIMITED;