Peter, I've no real world experience with the Broker/CLI, I use SQL*Plus and my own scripts, so I can only guess here. Did you set the SERVICE_NAMES parameter? The instance might have de-registered itself from the listener on shutdown. I'd search for the differences in your listener setup on both ends. Best regards, Carel-Jan Engel === If you think education is expensive, try ignorance. (Derek Bok) === On Fri, 2005-04-15 at 01:56, Peter McLarty wrote: > Hi > I am configuring Dataguard for a customer and have an issue with the > switchover not being smooth > > The configuration is as follows > > Unix AIX 5.2 > Oracle 9.2.0.5 > > I have a primary and a single standby instance ellprd and elldrc located > on separate servers > > CREATE CONFIGURATION 'egat' AS > PRIMARY SITE IS 'mmmprd' > RESOURCE IS 'mmmprd_db' > HOSTNAME IS 'mmmprddbs' > INSTANCE NAME IS 'ellprd' > SERVICE NAME IS 'ellprd' > SITE IS MAINTAINED AS PHYSICAL; > > > > CREATE SITE 'mmmdrc' > RESOURCE IS 'mmmdrc_db' > HOSTNAME IS 'mmmdrcdbs' > INSTANCE NAME IS 'elldrc' > SERVICE NAME IS 'elldrc' > SITE IS MAINTAINED AS PHYSICAL; > > When i did the switchover from mmmprd to mmmdrc it seemed to work > correctly but when I then tried to swich then back I get the following > in dgmgrl > > DGMGRL> switchover to mmmprd; > Performing switchover NOW. Please wait... > Operation requires restart of site "mmmdrc" > Operation requires restart of site "mmmprd" > Shutting down site mmmdrc... > Unable to connect to database > ORA-12523: TNS:listener could not find instance appropriate for the > client connection > > Failed. > You are no longer connected to ORACLE > Please connect again. > Unable to shut down mmmdrc > You must restart site "mmmdrc" manually. > You must restart site "mmmprd" manually. > Switchover succeeded. New primary is "mmmprd" > > > I then had to restart both intances to get DGbroker to report the > configuration was running ok. > > Any ideas as to what might cause this > > Cheers > > Peter > > -- > //www.freelists.org/webpage/oracle-l -- //www.freelists.org/webpage/oracle-l