How query data in pl/sql via ODBC from DB2 on AS400

Hi,
What's the most easy way to do some selects on tables in an external (non-oracle)database via odbc?
I only need selects, no dml-statements like inserts en updates...
Where can I find more information about this subject?
Filip

You need to use Oracle Heterogeneous Services. Firstly you have to obtain and configure DB2 ODBC drivers. I got mine from ibm.com (not free) but I am sure there are some third party vendors out there. I don't know much about DB2 so I can't help you with the configuration (I asked a DB2 DBA to help me with that part).
The rest is just setting up Oracle HS and creating the DB link. The following steps should help but there are much more detailed manuals for Oracle HS on http://tahiti.oracle.com.
Listener Configuration
Add the following entry into the SID_LIST part of the listener. The SID_NAME will be used in the heterogeneous services configuration
(SID_DESC=
(SID_NAME=db2)
(ORACLE_HOME=D:\oracle\ora92)
(PROGRAM=hsodbc)
Restart the listener.
Heterogeneous Service Configuration
Under ORACLE_HOME\HS\admin create the following text file called initDB2.ora (the DB2 part should match the SID_NAME used in the listener configuration).
Put the following line in the text file (the DQ01 is the name of the DB2 ODBC System DSN):
HS_FDS_CONNECT_INFO=DQ01
Client Configuration
The client side refers to an Oracle database that will use the heterogeneous gateway.
TNSNames Entry
Put the following entry in the tnsnames.ora file (the SID part should match the SID_NAME in the listener configuration):
DB2.telkom.co.za =
(DESCRIPTION=
(ADDRESS=(PROTOCOL=tcp)(HOST=cntrra20-esdt00)(PORT=1521))
(CONNECT_DATA=(SID=db2))
(HS=OK)
Database Link
Create a database link that references the new tnsnames.ora entry:
create public database link db2
connect to oratst identified by oracle using 'db2';
Test the database link.

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