OpenLDAP is not Oracle. It probably should not have an oracle context.One can provide a replacement for tnsnames.ora for Oracle SQL clients via LDAP service. That's probably what the original poster wants to achieve. No problem to implement such a service based on OpenLDAP provided you load the right schema.
Part of why I put the word "probably". ;) I.e., in case there was something outside of a direct OID->OpenLDAP migration in play.
--Quanah -- Quanah Gibson-Mount Product Architect Symas Corporation Packaged, certified, and supported LDAP solutions powered by OpenLDAP: <http://www.symas.com>