Link between Oracle database 10g and Oracle database 11g database

We have a database from Oracle 10 g to which connect us with SID = mod

The TNS names file is present in the directory Oracle NETWORK\ADMIN on the development computer contains the following two entries among others

MOD =

(DESCRIPTION =

(ADDRESS_LIST =

(ADDRESS = (PROTOCOL = TCP) (HOST = 10.70.10.23)(PORT = 1521))

(ADDRESS = (PROTOCOL = TCP) (HOST = 10.70.10.21)(PORT = 1521))

)

(CONNECT_DATA =

(SERVICE_NAME = mod)

)

)

NEWMOD =

(DESCRIPTION =

(ADDRESS_LIST =

(ADDRESS = (PROTOCOL = TCP) (HOST = 10.70.10.7)(PORT = 1521))

(ADDRESS = (PROTOCOL = TCP) (HOST = 10.70.10.9)(PORT = 1521))

(LOAD_BALANCE = yes)

)

(CONNECT_DATA =

(SERVER = DEDICATED)

(SERVICE_NAME = MOD)

)

)

In the SQL client we can log on to the mod and newmod each with its own username and password.

To create a link of database as follows

CREATE newmod CONNECT TO DATABASE LINK Public user1 IDENTIFIED BY password1 USING 'newmod ';

the database link is created without problems.

However, in trying to retrieve data from tables in the database that uses 10.70.10.7 and 10.70.10.9 using a command like

Select Column1 table1@newmod;

We get the following error:

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

How can access us the tables at the entrance to tns newmod because it resides on a server 11g, while tns mod entry is on a 10g Server? (both use the same service name, but are located on different ip addresses)

Your help is very appreciated.

Have you set TNS_ADMIN variable? Check if you have any additional TNSNAMES file. ORA in your ORACLE_HOME files.

Point A of TN-entry NEWMOD to a host. Load Balancing is not needed.

Try to create the dblink with the connect descriptor.

create database DB_TEST link to connect to SCOTT

identified by "password" ' (DESCRIPTION = (ADDRESS = (PROTOCOL = TCP) (HOST = 10.70.10.9)(PORT = 1521)) (CONNECT_DATA = (SERVER = DEDICATED) (SERVICE_NAME = MOD)))';

Kind regards

Suntrupth

Tags: Database

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