error while trying to retrieve text for error ora-12526

应用连接数据库
error while trying to retrieve text for error ora-12526
[code]SQL> SELECT DATABASE_STATUS FROM V$INSTANCE;

DATABASE_STATUS
-----------------
ACTIVE

SQL> select logins from v$instance;

LOGINS
----------
RESTRICTED[/code]
数据库处于限制状态，查看alert，发现应用的人改数据库字符集，将数据库改成受限模式，却没有改回去，
[code]SQL> alter system disable restricted session;

System altered.

SQL> select logins from v$instance;

LOGINS
----------
ALLOWED[/code]