说明：
建议在刚安装完的时候进行修改，对已经投产的系统，风险太大！
步骤如下：
1. Make sure the parallel_server parameter in INIT.ORA is set to false
or it is not set at all.
2. Execute the following commands in Server Manager (svrmgrl):
SVRMGR> SHUTDOWN IMMEDIATE; -- or NORMAL
SVRMGR> STARTUP MOUNT;
SVRMGR> ALTER SYSTEM ENABLE RESTRICTED SESSION;
SVRMGR> ALTER SYSTEM SET JOB_QUEUE_PROCESSES=0;
SVRMGR> ALTER SYSTEM SET AQ_TM_PROCESSES=0;
SVRMGR> ALTER DATABASE OPEN;
SVRMGR> ALTER DATABASE [NATIONAL] CHARACTER SET INTERNAL_USE ;
SVRMGR> SHUTDOWN IMMEDIATE; -- OR NORMAL
SVRMGR> STARTUP RESTRICT;
3. Restore the parallel_server parameter in INIT.ORA, if necessary.
4. Execute the following commands in Server Manager:
SVRMGR> SHUTDOWN IMMEDIATE; -- OR NORMAL
SVRMGR> STARTUP;
如果没有登陆，首先执行
SVRMGR> connect internal;