打开SQL plus 随便找个用户登录 最后输入commit; Microsoft Windows XP [版本 5.1.2600] (C) 版权所有 1985-2001 Microsoft Corp. C:-Documents and Settings-Administrator>sqlplus /nolog SQL*Plus: Release 10.1.0.2.0 - Production on 星期六 6月 26 11:08:34 2010 Copyright (c) 1982, 2004, Oracle.All rights reserved. SQL> conn /as sysdba Connected. SQL> alter user system identified by "123456"; User altered. SQL> alter user sys identified by "123456"; User altered. SQL> alter user system identified by "123456"; User altered. SQL> exit Disconnected from Oracle Database 10g Enterprise Edition Release 10.1.0.2.0 - Pr oduction With the Partitioning, OLAP and Data Mining options C:-Documents and Settings-Administrator>sqlplus SQL*Plus: Release 10.1.0.2.0 - Production on 星期六 6月 26 11:11:34 2010 Copyright (c) 1982, 2004, Oracle.All rights reserved. Enter user-name: system Enter password: Connected to: Oracle Database 10g Enterprise Edition Release 10.1.0.2.0 - Production With the Partitioning, OLAP and Data Mining options SQL>select instance_name from v$instance; INSTANCE_NAME -------------------------------- myfirstoracledb