ERROR:
ORA-12526: TNS: 监听程序: 所有适用例程都处于受限模式
解决：
C:\Users\test>sqlplus / as sysdba
SQL*Plus: Release 12.1.0.2.0 Production on
Copyright (c) 1982, 2014, Oracle. All rights reserved.
连接到:
Oracle Database 12c Enterprise Edition Release 12.1.0.2.0 - 64bit Production
With the Partitioning, OLAP, Advanced Analytics and Real Application Testing opt
ions
SQL> ALTER SYSTEM DISABLE RESTRICTED SESSION;
系统已更改。
SQL> select open_mode from v$database;
OPEN_MODE
--------------------
READ WRITE
SQL>
ORA-12526: TNS: 监听程序: 所有适用例程都处于受限模式
原文：https://www.cnblogs.com/ataoxz/p/15150790.html