Good evening, just wondering - is there a reason for those on the list to turn off dynamic registration of listeners in single instance? What I can see go wrong is that a DBA works on a ticket, creates a database and promptly forgets to edit the sid_list_listenerName () ... and then is surprised that no one can connect. I was thinking of using the IPC method which to me looks a lot simpler to implement. Applying patches is always tricky since no one wants to take the outage. Martin -- http://martincarstenbach.wordpress.com -- //www.freelists.org/webpage/oracle-l