DBLINK ERROR

user600135

Hi all

Thanks for your answer

I have created db link to remote database and i try to run the below query SELECT sysdate FROM [email protected]_link2;

while executing the above query i am getting the following error

ORA-12154: TNS:could not resolve the connect identifier specified

Please anyone help me to resolve the issue

Thanks

Regards

Mahesh boopathi.k.s.

Robert Geier

Did you add an entry to the database ORACLE_HOME/network/admin/tnsnames.ora ?
Try to tnsping the database you created the link to.

Check that the link was created properly.

select db_link, host from user_db_links.

---------------------------------------------
http://www.ContractOracle.com

user600135

Hi Robert,

Thanks for your reply

I have added alias name in the tns name ora file

Now i am getting the following error
ORA-12541: TNS:no listener( i have login that remote db through VPNonly is this the issue)

Please give the direction

Regards

Mahesh

591186

did you try tnsping?

108476

Hi,

Here is how I troublleshoot a DBA Link problem: http://www.dba-oracle.com/t_troubleshooting_sql_net_connectivity_errors.htm

1 Check with "ping" using the IP address ("ping 198.11.34.43"

2 Check with "ping" using DNS name (e.g. "tnsping uranus")

3 Check with "tnsping" using TNS service name

4 Sign-on to SQL*Plus with a remote user ("connect fred/[email protected]_link"

5 Within SQL*Plus, try a select from [email protected]_db_link


Hope this answers your question . . .

Donald K. Burleson
Oracle Press author
Author of "Oracle Tuning: The Definitive Reference":
http://www.dba-oracle.com/bp/s_oracle_tuning_book.htm

Anand...

Hi...

Is ur target datbase listener started where the db link is connecting the source database.Check the status of the listener lsnrctl status on the target DB, if not started start it (lsnrctl start).

Also tnsping to the target afer starting the listener on it.


Regards,
Anand

user600135

Yes i tried but it get fail

what could be the reason for that?

please give the direction

Regards
Mahesh

429475

Can you verify that your firewall allows outbound connections destined for target database server on the port 1521 or
what ever the port is defined in tnsnames.ora file

449681

The tns entry should be there in the tnsnames.ora of the server where source database is running. Many people think that the tns entry for a db link is required to be on the machine from where they are trying to connect which is not true.

Hope this helps.

Thanks,
Ankit.

658148

This may help,

http://www.errorkey.com/Search/Index.aspx?q=TNS-12154

Robert Geier

Can you please stop spamming the group with links to errorkey.com. We can all find the error message using oerr on the server.

Giving a link to the error message does not provide any useful information. I guess you earn money from the google adds on the site ?