Database Links in tnsnames.ora

Hi ,

We are on SAP ECC 6.0 EHP 6 on Oracle 11.2.

We have few database links which were used in some of ABAP Programs to connect to External Databases. When we tried to find the definitions of  them in TNSNAMES.ORA we are unable to locate them.

Is it possible that they can be defined in any other file ? Please Suggest where we should look for them to be able to verify to which  hosts they are

connecting.

Let me know if you require any further details.

Thanks in advane.

Regards,

Mallik.