Is it possible to have one listener and multiple db's with multiple oracle homes but all of them listening on Port 1521. Here's the case - I have a sun box with multiple SAP oracle dbs and multiple non-SAP oracle dbs. All non-SAP dbs share a single oracle home but EACH of the SAP db has their own oracle home. Currently only one listener.ora file from nonSAP oracle home runs with multiple listeners on different ports. So again, my question is - Can I consolidate all these multiple listeners to one listener and have all of them listening on Port 1521.
Here is the current listener.ora file for better understanding.
# LISTENER.ORA Network Configuration File: /db00/Ora817/network/admin/listener.ora
# Generated by Oracle configuration tools.
Clients that are to use dynamically registered service handlers should use connect descriptors that contain a SERVICE_NAME parameter value that is different from the GLOBAL_DBNAME parameter value specified in the listener.ora. This service name has to be configured in the initialization parameter file with the SERVICE_NAMES parameter. Once the database is started, the service name is dynamically registered with the listener and the clients can connect to the database.
For an environment with pre-release 8.1 clients, an analogous modification needs to be done for INSTANCE_NAME parameter in the initialization parameter file. It has to be set to a value different from SID_NAME specified in the listener.ora file. The INSTANCE_NAME parameter value dynamically registers with the listener along with the SERVICE_NAMES parameter value and service handler information. The fact that this INSTANCE_NAME parameter value is different from the SID_NAME parameter value in the listener.ora file ensures that the clients that use connect descriptors containing SID (and matching the SID_NAME value) are redirected to a prespawned dedicated server.