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1、使用oracle用户登录，连接数据库

[oracle@wuzj ~]$ sqlplus /nolog

SQL*Plus: Release 10.2.0.1.0 - Production on Thu Feb 26 12:06:29 2009

Copyright (c) 1982, 2005, Oracle. All rights reserved.

SQL> conn /as sysdba

Connected.

//查看用户

SQL> select username,password from dba_users;

USERNAME PASSWORD

------------------------------ ------------------------------

USER1 BBE7786A584F9103

MGMT_VIEW 4F538DF5F344F348

SYS 8A8F025737A9097A

SYSTEM 970BAA5B81930A40

DBSNMP FFF45BB2C0C327EC

SYSMAN 2CA614501F09FCCC

OUTLN 4A3BA55E08595C81

MDSYS 72979A94BAD2AF80

ORDSYS 7EFA02EC7EA6B86F

EXFSYS 66F4EF5650C20355

DMSYS BFBA5A553FD9E28A

USERNAME PASSWORD

------------------------------ ------------------------------

WMSYS 7C9BA362F8314299

CTXSYS 71E687F036AD56E5

ANONYMOUS anonymous

XDB 88D8364765FCE6AF

ORDPLUGINS 88A2B2C183431F00

SI_INFORMTN_SCHEMA 84B8CBCA4D477FA3

OLAPSYS 3FB8EF9DB538647C

SCOTT F894844C34402B67

TSMSYS 3DF26A8B17D0F29F

BI FA1D2B85B70213F3

PM 72E382A52E89575A

USERNAME PASSWORD

------------------------------ ------------------------------

MDDATA DF02A496267DEE66

IX 2BE6F80744E08FEB

SH 9793B3777CD3BD1A

DIP CE4A36B8E06CA59C

OE 9C30855E7E0CB02D

HR 6399F3B38EDF3288

28 rows selected.

//修改用户口令 格式 alter user 用户名 identified by 新密码;

SQL> alter user system identified by manager;

User altered.

//再次查看，对比发现密码已经更换

SQL> select username,password from dba_users;

USERNAME PASSWORD

------------------------------ ------------------------------

USER1 BBE7786A584F9103

MGMT_VIEW 4F538DF5F344F348

SYS 8A8F025737A9097A

SYSTEM D4DF7931AB130E37

DBSNMP FFF45BB2C0C327EC

SYSMAN 2CA614501F09FCCC

OUTLN 4A3BA55E08595C81

MDSYS 72979A94BAD2AF80

ORDSYS 7EFA02EC7EA6B86F

EXFSYS 66F4EF5650C20355

DMSYS BFBA5A553FD9E28A

USERNAME PASSWORD

------------------------------ ------------------------------

WMSYS 7C9BA362F8314299

CTXSYS 71E687F036AD56E5

ANONYMOUS anonymous

XDB 88D8364765FCE6AF

ORDPLUGINS 88A2B2C183431F00

SI_INFORMTN_SCHEMA 84B8CBCA4D477FA3

OLAPSYS 3FB8EF9DB538647C

SCOTT F894844C34402B67

TSMSYS 3DF26A8B17D0F29F

BI FA1D2B85B70213F3

PM 72E382A52E89575A

USERNAME PASSWORD

------------------------------ ------------------------------

MDDATA DF02A496267DEE66

IX 2BE6F80744E08FEB

SH 9793B3777CD3BD1A

DIP CE4A36B8E06CA59C

OE 9C30855E7E0CB02D

HR 6399F3B38EDF3288

28 rows selected.

SQL>

//现在就可以用此密码链接进行操作了

SQL> connect system/manager

已连接。

==========================

另一种修改值的办法

SQL> alter user system identified by values '2D594E86F93B17A1';

用户已更改。

//在试试这个密码

SQL> connect system/oracle

已连接。

//这个密码就不灵了

SQL> connect system/manager

ERROR:

ORA-01017: invalid username/password; logon denied

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