Well, the question was about discovering listener itself and not the databases it serves.
2006/6/15, Smith, Steven K - MSHA <Smith.Steven@(protected)>: > I don't know if 10g is different then 9i, but in 9i the instances need > to be explicitly defined in the listener.ora file. The agent parses the > listener.ora file using the information gained from the oratab file. If > the database is not defined in the listener.ora file, it will not find > it.