RE: How to handle the exception when remote db is down

Sami,

The problem is that Oracle is still holding the update to the remote database open. Try the following:

  1 create or replace procedure db_lnk_test_proc(i_p1 number)   2 as
  3 begin
  4 insert into db_lnk_test values(i_p1,'From a1 db',sysdate);

      Commit; <========== This makes sure your first insert works   5 begin
  6 insert into db_lnk_test_at_testa values(i_p1,'From a1 db',sysdate);   7 exception when others then

      Rollback; <===== Rollback the remote transactions   8 insert into db_lnk_test_Q values(i_p1,'From a1 db',sysdate); -- If the remote db is down insert into QUEUE table   9 end;
 10 commit;
 11* end;

You could also look at using savepoints. Nick had a good idea also about looking at Advanced Queueing.

Tom

-----Original Message-----

From: Sami Seerangan [mailto:dba.orcl_at_gmail.com] Sent: Tuesday, February 15, 2005 8:47 PM To: oracle-l_at_freelists.org
Subject: How to handle the exception when remote db is down

Hi All,

I am trying to do DML activity on both local and remore DB. If the remote db is down, I need to insert the values into temporary table on the local db so that later when the remore db becomes available I can push the records.

This is what I did but don't know how to handle the exception when remote db is down.

SQL> desc db_lnk_test

 Name                                      Null?    Type
 ----------------------------------------- --------


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

 C1                                                 NUMBER
 C2                                                 VARCHAR2(100)
 C3                                                 DATE

SQL> desc db_lnk_test_Q
 Name                                      Null?    Type
 ----------------------------------------- --------


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

 C1                                                 NUMBER
 C2                                                 VARCHAR2(100)
 C3                                                 DATE 
 
 

SQL> create database link testa connect to MY_USER identified by temp_123 using 'testa';  

Database link created.

SQL> get p1
  1 create or replace procedure db_lnk_test_proc(i_p1 number)   2 as
  3 begin
  4 insert into db_lnk_test values(i_p1,'From a1 db',sysdate);   5 begin
  6 insert into db_lnk_test_at_testa values(i_p1,'From a1 db',sysdate);   7 exception when others then
  8 insert into db_lnk_test_Q values(i_p1,'From a1 db',sysdate); -- If the remote db is down insert into QUEUE table   9 end;
 10 commit;
 11* end;
SQL> SQL> exec db_lnk_test_proc(1);  

PL/SQL procedure successfully completed.

SQL> exec db_lnk_test_proc(5);
BEGIN db_lnk_test_proc(5); END;  

*
ERROR at line 1:

ORA-02067: transaction or savepoint rollback required
ORA-06512: at "MY_USER.DB_LNK_TEST_PROC", line 8
ORA-02055: distributed update operation failed; rollback required
ORA-02068: following severe error from TESTA
ORA-03113: end-of-file on communication channel
ORA-06512: at line 1
 

Thanks
Sami
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http://www.freelists.org/webpage/oracle-l Received on Wed Feb 16 2005 - 08:40:16 CST