C:\Users\Y2>sqlplus

SQL*Plus: Release 11.2.0.1.0 Production on 星期五 4月 24 16:41:19 2020

Copyright (c) 1982, 2010, Oracle.  All rights reserved.

请输入用户名:  sys as sysdba 输入口令:

连接到: Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - 64bit Production With the Partitioning, OLAP, Data Mining and Real Application Testing options

SQL> select  1 from dual;

         1 ----------          1

SQL> 从 Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - 64bit Production With the Partitioning, OLAP, Data Mining and Real Application Testing options 断开

C:\Users\Y2>sqlplus /nolog

SQL*Plus: Release 11.2.0.1.0 Production on 星期五 4月 24 16:42:05 2020

Copyright (c) 1982, 2010, Oracle.  All rights reserved.

SQL> select  1 from dual; SP2-0640: 未连接 SQL> connect  as sysdba; 请输入用户名:  sys 输入口令: 已连接。 SQL> select  1 from dual;

         1 ----------          1

SQL>