Oracle 修改Database Link密码

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生产库上要修改生产用户的密码，密码修改完后就涉及到修改dblink的密码。
11gR2版本之前只能删除dblink后重建，11gR2版本后可以直接修改。
修改dblink的密码有两种方法：
    1、删除dblink后重建
    2、直接修改dblink的用户密码
下面测试两种方法：
测试库版本：11.2.0.4.0
创建两个dblink，一个PUBLIC另一个PRIVATE

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create PUBLIC database link link_101 connect to SYSTEM identified by "123456" using '(DESCRIPTION =     (ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.56.11)(PORT = 1521))     (CONNECT_DATA =       (SERVER = DEDICATED)       (SERVICE_NAME = mydb)     )   )'; create database link link_102 connect to SYSTEM identified by "123456" using '(DESCRIPTION =     (ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.56.11)(PORT = 1521))     (CONNECT_DATA =       (SERVER = DEDICATED)       (SERVICE_NAME = mydb)     )   )'; sys@ORCL>select * from dual@link_101; DUM --- X sys@ORCL>select * from dual@link_102; DUM --- X

修改远端数据库密码

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SQL> alter user system identified by "654321"; User altered. sys@ORCL>select * from dual@link_101; select * from dual@link_101                    * ERROR at line 1: ORA-01017: invalid username/password; logon denied ORA-02063: preceding line from LINK_101 sys@ORCL>select * from dual@link_102; select * from dual@link_102                    * ERROR at line 1: ORA-01017: invalid username/password; logon denied ORA-02063: preceding line from LINK_102

方法一：

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sys@ORCL>drop public database link link_101; Database link dropped. sys@ORCL>drop database link link_102; Database link dropped. create PUBLIC database link link_101 connect to SYSTEM identified by "654321" using '(DESCRIPTION =     (ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.56.11)(PORT = 1521))     (CONNECT_DATA =       (SERVER = DEDICATED)       (SERVICE_NAME = mydb)     )   )'; create database link link_102 connect to SYSTEM identified by "654321" using '(DESCRIPTION =     (ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.56.11)(PORT = 1521))     (CONNECT_DATA =       (SERVER = DEDICATED)       (SERVICE_NAME = mydb)     )   )'; sys@ORCL>select * from dual@link_101; DUM --- X sys@ORCL>select * from dual@link_102; DUM --- X

方法二：

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sys@ORCL>select * from dual@link_101; select * from dual@link_101                    * ERROR at line 1: ORA-01017: invalid username/password; logon denied ORA-02063: preceding line from LINK_101 sys@ORCL>select * from dual@link_102; select * from dual@link_102                    * ERROR at line 1: ORA-01017: invalid username/password; logon denied ORA-02063: preceding line from LINK_102 sys@ORCL>alter public database link link_101 connect to system identified by "654321"; Database link altered. sys@ORCL>alter database link link_102 connect to system identified by "654321"; Database link altered. sys@ORCL>select * from dual@link_101; DUM --- X sys@ORCL>select * from dual@link_102; DUM --- X

方法二如果提示ORA-01031: insufficient privileges，则赋权grant alter database link to zx;