Oracle – on using oracle database link theres an error “ORA-12154 TNS Could not resolve the connect identifier specified”

database-linkoracle

I'm trying to define a database link on oracle 10.2 with connection identifier that throws the error in the question header.
I have the connection identifier (service name) in my tnsnames.ora file.
I can connect with sqlplus using this service name. no problem.
This is the creation sql:

create database link dev1.REGRESS.RDBMS.DEV.US.ORACLE.COM
connect to user1 identified by pass1
using 'dev1';

select using the link:
select * from t_users@dev1;

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

connecting to oracle with sqlplus to the 'unidentified' service (with no problem):
sqlplus user1/pass1@dev1

I defined another link to the same database I'm woking in (loopback) – works OK.

I read and tried anything I could find about the subject but did not solve this.

Any suggestions?

Best Answer

Try:

create database link dev1 connect to user1 identified by pass1 using 'dev1';

Also note that a tnsnames.ora entry for dev1 has to exist on the database server that you're linking from.

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