故障介绍：

我在Oracle10.2.0.4中建立连接到11.2.0.3的DBLINK验证的时候出现如下错误：

ORA-01017: invalid username/password; logon denied

ORA-02063: preceding line from

分析错误：

从错误信息来看，是用户名和密码的错误，但是用户名和密码我确定没有问题，能够通过密码进行访问数据库。

详细回顾及出现问题及排错思路如下:

创建dblink使用的用户/密码是正确的。

SQL> conn prudent/woo@woo

Connected to Oracle Database 11g Enterprise Edition Release 11.2.0.3.0

Connected as woo创建dblink的数据库版本：

SQL> select * from V$VERSION;

BANNER

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

Oracle Database 10g Enterprise Edition Release 10.2.0.4.0 - 64bi

PL/SQL Release 10.2.0.4.0 - Production

CORE 10.2.0.4.0 Production

TNS for Linux: Version 10.2.0.4.0 -Production

NLSRTL Version 10.2.0.4.0 - Production

ORACLE 10.2.0.4中创建到Oracle 11.2.0.3.0的DBLINK，创建成功

SQL> create database link woo_100

2 connect to prudent

3 identified by woo

4 using '(DESCRIPTION =

5 (ADDRESS_LIST =

6 (ADDRESS = (PROTOCOL =TCP)(HOST = 192.168.0.100)(PORT = 1521))

7 )

8 (CONNECT_DATA =

9 (SERVER = DEDICATED)

10 (SID = woo)

11 )

12 )';

但使用dblink去访问目标数据库时出错QL> select sysdate from dual@woo;

select sysdate from dual@woo

ORA-01017: invalid username/password; logondenied

ORA-02063: preceding line from woo_100