How to refresh a created database link?

Question

I have created a database link with the command:
CREATE DATABASE LINK mydb.net CONN TO STRMADM IDENTIFIED BY strmadm_pw USING 'mydb.net'
and then i changed strmadm_pw at the remote database, which may cause the database link inactive. but how to activiate the link again?

Answer 1

The best thing is always to try it :
SQL> show user
USER is "SCOTT"
SQL> create database link test connect to test identified by test using 'orcl';
Database link created.
SQL> create synonym test_tab for test_tab@test;
Synonym created.
SQL> select count(*) from test_tab;
  COUNT(*)
         1
SQL> create or replace function test_func return number is
  2     counter number;
  3  begin
  4     select count(*) into counter from test_tab@test;
  5     return counter;
  6* end;
SQL> /
Function created.
SQL> select test_func from dual;
TEST_FUNC
         1
SQL> conn / as sysdba
Connected.
SQL> alter user test identified by test1;
User altered.
SQL> conn scott/tiger
Connected.
SQL> select count(*) from test_tab;
select count(*) from test_tab
ERROR at line 1:
ORA-01017: invalid username/password; logon denied
ORA-02063: preceding line from TEST
SQL> select test_func from dual;
select test_func from dual
ERROR at line 1:
ORA-01017: invalid username/password; logon denied
ORA-02063: preceding line from TEST
ORA-06512: at "SCOTT.TEST_FUNC", line 4
SQL> drop database link test;
Database link dropped.
SQL> create database link test connect to test identified by test1 using 'orcl';
Database link created.
SQL> select count(*) from test_tab;
  COUNT(*)
         1
SQL> select test_func from dual;
TEST_FUNC
         1
SQL>